ARM CM940T manual

ARM DUI 0125A ARM Integrator/CM940T User Guide[...]

ii © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A ARM Integrator/CM940T User Guide © Copyri ght ARM L im ite d 199 9. All rights reserve d. Release information Proprietary notice ARM, the A RM Powe re d lo go, Thumb an d StrongARM are reg istered trad emarks of ARM Limited. The ARM logo, AMBA, Angel, ARMulator, EmbeddedICE, Mod[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. iii Electromagnetic conformity This section contains electromagnetic conformity (EMC) no tices. Federal Communications Commiss ion Notice NOTE: This equipment has been tested and found to comply with the limits for a class A digital device, p ursuant to par t 15 of the FCC r ules. Th[...]

iv © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. v Contents ARM Integrator/CM9 40T Use r Guide Electromagn etic conf ormity ................ ............ ........... ........... ................. ........... ........... ... iii Prefac e About this docume nt ..................... ........... ........... ................. ...........[...]

vi © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 3.5 Reset c ontroller ..................... ........... ............ ........... ........... ................. ......... 3-8 3.6 System bus br idge ...... ........... ................. ........... ........... ............ ................ .. 3-11 3.7 Clock g enerators ...........[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. vii Preface This preface introdu ces the ARM Integrator/CM940T co re module and its refer ence documentatio n. It contains the following sections : • About this documen t on page viii • Further r eading on page x • Feedback on page xi.[...]

viii © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A About this document This documen t desc ribes ho w to se t up and u se th e ARM Integrat or/CM9 40T core module. Intended audience This document has been written for exp erienced hardware and software develope rs to aid the develo pment of AR M-based prod ucts us ing th e ARM I[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. ix T ypographical conventions The following typo graphical conventio ns are used in this do cument: bold Highlights ARM processor signal names within text, and interface elements such as menu names. May also be used for emphasis in descriptive lists where appr opriate. italic Highlig[...]

x © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A Further reading This section lis ts related publications by ARM Lim ited and other compan ies th at may provide addit ional in for mation. ARM publications The followi ng publ ications provide i nformat ion ab out rel ated ARM p roducts and toolk its: • ARM740T T echnical Refer [...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. xi Feedback ARM Lim ited welcomes feedback both on the ARM Integrator/CM940T co re mod ule and on the do cumentation. Feedback on this document If you hav e any comment s about this docum ent, please send email to errata@arm.com giving : • the documen t tit le • the docum ent num[...]

xii © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 1-1 Chapter 1 Introduction This chapter introduces the ARM Integrator/CM940T core mo dule. It contains the follow ing sections: • About the ARM Integ rator/CM940 T cor e module on page 1-2 • ARM In tegrat or/CM94 0T over view on page 1-4 • Links and ind icat or s on page 1-8 ?[...]

Introduction 1-2 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 1.1 About the ARM Integrator/CM940T core module The Integrator/CM94 0 T core module provides you with the b asis of a flexible developmen t system whi ch can be used in a number of different ways . With power and a simple connection to a Multi-I CE debugger, the cor[...]

Introduction ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 1-3 Figure 1-1 Inte grator/CM940T l ayout Multi-ICE connector Po w e r connector Processor core Reset button DIMM sock et Memory controller and system bus bridge (FPGA) SDRAM DIMM Core module/motherboard connectors HDRA Core module/motherboard connectors HDRB[...]

Introduction 1-4 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 1.2 ARM Integrator/CM940T overview The major compo nents on the core mo dule are as follows: • ARM940T m icropr ocessor cor e • core modu le FPGA which implements : — SDRAM controller — sys tem bus b ridge — reset controller — interrupt cont roller — s[...]

Introduction ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 1-5 1.2.2 Core module FPGA The FPGA provides system control functions for the core module, enabling it to operate as a standalone development system or attached to a motherboar d. These functions are outlined in thi s section and des cribed in detail in Chapter 3 Hardwar[...]

Introduction 1-6 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A Status and configuration space The status and configuration space co ntains status and configuration registers for the core module. These pro vide th e following information and control: • type of processor an d whether it has a cache, MMU, or pr otection unit •[...]

Introduction ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 1-7 1.2. 5 Mult i - ICE co nnec to r The Multi-ICE conn ector enables JTAG hardwar e debuggin g equipment, such as Multi-ICE, to be con nected to the core module. It is possible to both dr ive and sense the system- r eset line ( nSR ST ), and to drive JTAG reset ( nTRST [...]

Introduction 1-8 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 1.3 Links and indi cators The core modu le provides one link an d four su rface-mounted LEDs. Th ese are illustrated in Figure 1-3. Figure 1-3 Li nks and indicato rs 1.3.1 CONFIG link The core modu le has only on e link, marked CONFIG. Th is is left open during norm[...]

Introduction ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 1-9 1.3.2 LED indicators The functio ns of the four surface-mo unted LEDs are summarized in Table 1- 1. Table 1-1 LE D funct ional summa ry Name Color Function MISC Green This LED is controll ed via the control regi ster (see CM_C TR L (0x1 00 0000C) on page 4- 1 1). FPG[...]

Introduction 1-10 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 1.4 T est points The core modu le pro vides two gr ound and f ive signal t est poin ts as an aid to debug . These are illustrated in Figure 1-4 . Figure 1-4 T est points The functions of th e test points are summarized in Table 1 -2. Table 1-2 Test point functions [...]

Introduction ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 1-11 1.5 Precautions This section contains safety information and advice on how to avoid damage to the core module. 1.5.1 E nsuring safety Warning To avoid a safety hazard, only Safety Extra Lo w Voltage (SELV) equipment s ho uld be connected to the JTAG interface. 1.5.2[...]

Introduction 1-12 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 2-1 Chapter 2 Gett ing Sta r te d This chapter describes how to set up and prepare the ARM Integrato r/CM940T core module for use. It con tains the following sections: • Setting up a s tandal one ARM Integrat or/C M940T on page 2-2 • Attaching th e ARM Integrator/CM9 40T to a mot[...]

Getting Started 2-2 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 2.1 Setting up a standalone ARM Integrator/CM940T To set up the core module a s a standalone develop ment system: 1. Optionally , fit an SD RAM DIMM. 2. Suppl y po wer . 3. Connect Multi-ICE. 2.1.1 Fitting an SDRAM DIMM You shou ld fit the following type o f SDRA[...]

Getting Started ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 2-3 2.1.3 S upplying power When using the core modul e as a st andalon e de vel opm ent s ys tem, y ou should conn ect a bench power supp ly with 3 .3V and 5V outputs to the p ower connect or, as i llustrated in Figu re 2-1. Figure 2-1 Power connec tor Note This power[...]

Getting Started 2-4 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 2.1.4 Connecting Multi-ICE When you ar e using th e core mod ule as a stan dalone system , Multi-IC E debugg ing equipment can be u sed to download pr ograms. The Mu lti-ICE setup for a standalone cor e modu le is show n in F igur e 2-2 . Figure 2-2 Mu lti-ICE co[...]

Getting Started ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 2-5 2.2 Attaching the ARM Integrator/CM940T to a m otherboard Attach the core modu le onto a moth erboard ( for example, the AR M Integrator/SP) by engaging the connectors HDRA and HDRB on the bottom of the core module with the corresponding connectors on the top of t[...]

Getting Started 2-6 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 2.2.1 Core module ID The ID of the core module is configured autom atically by the connectors (there are no links to set) and depends on its p osition in the stack : • core module 0 is instal led first • core modu le 1 is install ed nex t, and canno t be fi t[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-1 Chapter 3 Hardware Description This chapter describes the on- board hardware. It contains the following sections: • ARM940T micr oprocessor co r e on pag e 3-2 • SSRAM contr oller on page 3-3 • Cor e m odule FPGA on page 3-4 • SDRAM contr oller on page 3-6 • Reset contr[...]

Hardware Description 3-2 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 3.1 ARM9 40T microproc es sor co re The ARM940T cached pr ocessor macrocell is a member of the ARM9 Thumb family of high- performan ce 32-bit system-on -a-chip pr ocesso rs. It p rovides the fo llowin g: • ARM9TDMI RISC int eger CP U • 4KB instruction an[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-3 3.2 SS RAM co ntroller The SSRAM controller is impl emented in a Xilinx 9572 PLD which enables the SSRAM to achieve single-cycle operation. In addition to controlling accesses to the SSRAM, the controller generates the processor response signals ( BWAIT , BER[...]

Hardware Description 3-4 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 3.3 Core module FPGA The core modu le FPGA contains five main functional blocks: • SDRAM contr oller on page 3-6 • Reset controller on page 3-8 • System bus bridg e on page 3-1 1 • Cor e module r egisters on pag e 4-7 • Debug int errupt co ntroller[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-5 At power-up the FPGA lo ads its co nfigurati on data fr om a flash memory devi ce. Parallel data from the flash is serialized by the Programmable L ogic Device (PLD) into the configu r atio n inputs of the FPGA. Fi gure 3-2 shows th e FP GA configur atio n me[...]

Hardware Description 3-6 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 3.4 SDRAM controlle r The core modu le pro vides supp ort fo r a single 16, 32, 64, 128, or 25 6MB SDRA M DIMM. 3.4.1 SDRAM operati ng mode The operating mode of the SDRAM devices is controlled with the mode set reg ister within each SDRAM. These registers a[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-7 a 64 x 32-bit area of memor y (CM_SPD) within the SDRAM controller. The SPD flag is set in the SDRAM contro l regis ter (CM_SDRAM) when the SPD data is available. This copy can be r andomly accessed at 0 x10000100 to 0x10000 1FC (see CM_SPD (0x100001 00 to 0x[...]

Hardware Description 3-8 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 3.5 Rese t controller The core mod ule FPGA incorporates a reset contr oller which enables the co re module to be reset as a standalone uni t or as part of an Integrator de velopment system. The core module can be reset fr om five sour ces: • reset button [...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-9 3.5.1 Reset si gnals Table 3-1 describes t he external res et signal s. Table 3- 1 Reset signal d escription s Name Description T ype Function BnRES_M Processor r eset Output The BnRES_ M signal is u sed to reset the pr ocessor core. It is generated from nSRS[...]

Hardware Description 3-10 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 3.5.2 Software r esets The core module FPGA prov ides a software reset which can be trigg ered by writi ng to the reset bit in the CM _CTRL register. This generates the internal reset signal SWRST which generat es nSRS T an d resets the whole system (see C [...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-11 3.6 System bus bridge The system bus bridge provides an asynchrono us bus interface between the local system bus and s ystem bu s connect ing the mother board and o ther mo dules. Inter-module accesses are su pported by two 16 x 74-bit FIFOs. Each o f the 16[...]

Hardware Description 3-12 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A Write transactions from the processor to the system bus normally complete o n the local memory bus in a single cycle. Th e data, address, and con trol information associated with the transfer are posted into FIFO, and the transfer on the system bus occurs s[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-13 3.6.2 Motherboard a ccesses to SDR AM The second FIFO supports read and write accesses by system bus masters on the motherboard a nd other co re modules to the local co re module m emory. System bus w rites The data routing for system bus writes to SDRAM is [...]

Hardware Description 3-14 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A System bus reads The data routing for sy stem bus reads from SDRAM is illust rated in Figure 3-7. Figure 3-7 System bu s reads from SDRAM For system bus reads, the address and control information also pass through the FIFO, but th e returned data fr om the [...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-15 3.6.4 System bus signal routing The core module is mounted onto a motherboar d via the connectors HDRA and HDRB. As well as carrying all signal connection s between the boar ds, these provide mechanical mounting (s ee Attaching the ARM Integrat or/CM920T to [...]

Hardware Description 3-16 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A The example in Figure 3-8 illustrates how a group o f four signals (labelled A, B, C, and D) are routed throu gh a group of four con nector pins u p through t he stack. It highli ghts how signal C is rotated as it passes up through the stack an d only utili[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-17 3.7 Clock generators The core modu le provides its own cloc k generators an d operates asynchron ously with the mo therbo ard. T he cloc k gene rator pr ovide s two p r ogramm able c locks : • processor core clock CORECLK • processor local memory bus clo[...]

Hardware Description 3-18 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 3.7.1 Processor core clock (CO RECLK) The frequency of CORECLK is controllable in 1MHz steps in the range 12MHz to 160MHz. This is achieved by s etting the Vo ltage Contr olled Osci llator (VC O) di vider and output di vid er for the CORECLK generator via t[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-19 3.7.2 Processor bus cloc ks (LCLK and nLC LK) The frequency of the pr ocessor bus clocks LCL K and nLCLK is determined by the frequency of 2XCLK . The clock sign al 2XCLK is div ided by 2 by the SS RAM controller PLD to produce LCLK and nLCLK . The frequency[...]

Hardware Description 3-20 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A The LCLK clock si gnal is b uffered b y a 5-ou tput l ow-ske w buf fer PI49F CT3805 to drive five loads. These ar e: • SDRAM_CLK[3:0] •S S R A M _ C L K . The nLCLK clock si gnal is a phase-aligned inversion of the LC LK signal. It is buffered by a 5-ou[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-21 3.8 Multi-I CE support The core modu le provi des support for debug using JTAG. It pro vides a Multi -ICE connector and JTAG scan path s around the develo pment syst em. Figure 3- 10 shows t he Multi-ICE connector and the CONFIG link. Figure 3-10 JTAG conne [...]

Hardware Description 3-22 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 3.8.1 JT AG scan path Figure 3 -11 shows a simpli fied di agram of the scan pat h. Figure 3-11 J TAG scan pa th (simp lified) When the core module is used as a stand alone development system, the JTAG scan path is routed through the processor co re and back[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-23 3.8.2 De bugging modes The core modu le is capable of operating in two modes: • normal debug mode • confi guratio n mode. Normal debug mode During normal operation and software develop ment, the core module operates in debug mode. The deb ug mode is sele[...]

Hardware Description 3-24 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A The configuration mod e allows FPGA and PLD code to be updated as follows: • The FPGAs are volatile, bu t load their configuratio n from flash memory . Flash memo ry , wh ich itself does not ha ve a JT AG por t, can be pr ogram med by lo ading designs int[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-25 Table 3-4 J TAG signal descriptio n Name Description Function DBGR Q Debu g req ue s t (from JT AG equipment) DBGRQ is a request for the proc essor core to enter th e deb ug state. It is p rovided for compati bility with third-pa rty JT AG equipm ent. DBGACK[...]

Hardware Description 3-26 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A RTCK Return TCK (to JT AG equi pment) Some devi ces samp le TCK (for example a synthesizable core with only on e clock), and th is has the effect of delayin g t he t i me at which a com ponent ac t ually capture s data. RTCK is a mechanism fo r returnin g t[...]

Hardware Description ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 3-27 3.8.4 Debug communications interrupts The ARM940T processo r core incorpo rates EmbeddedICE h ardware and provides a debug commu nications data regi ster which i s used to pass dat a between the processo r and JTAG equipment. Th e processor accesses this reg[...]

Hardware Description 3-28 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-1 Chapter 4 Programmer’s Reference This chapter describes the memory map and the status and control registers. It contains the following sectio ns: • Memory or ganizat ion on page 4-2 • Exception vector mapping on page 4-6 • Cor e module r egisters on p age 4 -7 • Interru[...]

Programmer’s R eference 4-2 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 4.1 Memory organization This section d escribes the memory map. Fo r a st and alone core module, the memo ry map is limited to local SS RAM, SD RAM, and core module regis ters. For the full memory ma p of an In tegrator deve lopmen t system, which inclu[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-3 Motherboard detect The nMBDET signal operates as follows: nMBDE T =0 T he core module is attached to a motherboard, and accesses in the address range 0x0 t o 0x3FF FF t o the boot ROM or SS RAM are controlled by the REMAP bit. nMBDE T =1 T he core module[...]

Programmer’s R eference 4-4 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 4.1.3 SDRAM acc esses The Integrator mem ory map prov ides a 256MB addr ess space for SDRAM. When a smaller sized S DRAM DIMM is fitted, it i s mapped repeatedly to fill the 25 6MB space. For example, a 64MB DIMM appears four times, as shown in Figure 4[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-5 System bus acc esses to SDRAM If the core mod ule is mounted on a motherboard, the SDRAM is mapped to ap pear at the aliased mo dule memory region of t he combine d Integrator s ystem bus memo ry map. The SDRAM can be accessed by all b us masters at its [...]

Programmer’s R eference 4-6 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 4.2 Exception vect or mapping The convention f or ARM cores is to ma p the exception vector s to begin at add ress 0. However, the ARM940 T core al lows th e vectors to be moved to 0xFFFF000 0 by writing to the V b it in coprocessor 15 regis ter 1 (CP15[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-7 4.3 Core m odule regist ers The core modu le status and control r egisters allow the processor to deter mine its environment and to control some core module operations. The r egisters, listed in Table 4-2, are located at 0 x1000000 0 and can only be acce[...]

Programmer’s R eference 4-8 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 4.3.1 CM_ID (0x10 000 000) The core module ID register (CM_ID) is a read- only register that identifies the bo ard manufacturer , board type, and r evis ion. Table 4-3 de scribes t he core mod ule ID regis ter bits . 4.3.2 CM_PR OC (0x1000 0004) The cor[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-9 4.3.3 CM_OSC (0 x10 000 008) The core module oscillator register (CM_OSC) is a read/write register that controls the frequ ency of the clo cks gene rated by the two clo ck ge nerators (see C lock generato rs on page 3- 17). In addition, it prov ides info[...]

Programmer’s R eference 4-10 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 1 1 Reserved Use read-modify-write to preserv e value. 10:8 COREOD Read/write Core clock output divider: 000 = div ide by 10 001 = div ide by 2 (def au lt) 010 = div ide by 8 011 = divide by 4 100 = div ide by 5 101 = div ide by 7 1 10 = divi de by 9 1[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-11 4.3.4 CM_CTRL (0x1000 000C) The core modu le control register (CM_CTRL) is a read/write re gister that pro vides control of a nu mber of user-configurable f eatures of the core mo dule. Table 4-5 describes t he core module co ntrol register bi ts. Table[...]

Programmer’s R eference 4-12 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 4.3.5 CM_ST A T (0x 10000010) The core modu le statu s re gister (CM_STAT) is a read -on l y r egister that can be read to determine where in a mu lti-core modu le stack this core m odule is positioned. Table 4-6 de scribes t he core mod ule status reg[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-13 4.3.6 CM_LOCK (0x1 0000014) The core modu le lock register (CM_LOCK) is a read/write register that is used to control access to the CM_OSC register , allowing it to be lo cked and unlocked. Th is mechanism prevents the C M_OSC register from being ove rw[...]

Programmer’s R eference 4-14 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 4.3.7 CM_SDRAM (0x10 000 020) The SDRAM status and co ntrol register ( CM_SDRAM) is a read/write r egister used to set the configuration parameters fo r the SDRAM DIMM. This control is necessary because of the variety o f module sizes and types availab[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-15 Note Before the SDRAM is used it is necessary to read the SPD memory and p rogram the CM_SDRAM register with the parameters indicated in Table 4-8. If these valu es are not correctly set then SDRAM accesses may be slow or unreliable. See CM _SPD (0x1000[...]

Programmer’s R eference 4-16 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 4.3.8 CM_SPD (0x10 0001 00 to 0x100001 FC) This area of memory contain s a copy of the SPD data from the SPD EEPROM on the DIMM. Because accesses to the EEPROM are very slow, the data is copied to this memory during board initialization to allow faster[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-17 Example 4-1 CM_BASE EQU 0x10000000 ; base address of Core Module registers SPD_BASE EQU 0x10000100 ; base address of SPD information lightled ; turn on header LED and remap memory LDR r0, =CM_BASE ; load register base address MOV r1,#5 ; set remap and l[...]

Programmer’s R eference 4-18 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A not64 CMP r5,#0x80 ; is it 128MB? BNE not128 ; if no, move on MOV r6,#0xe ; store size and CAS latency of 2 B writesize not128 ; if it is none of these sizes then it is either 256MB, or ; there is no SDRAM fitted so default to 256MB. MOV r6,#0x12 ; sto[...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-19 4.4 Interrupt register s The core module provides a 3-bit IRQ co ntroller and 3-bit F IQ controller to su pport the debug commu nications channel u sed for passin g informat ion between applicati ons software and the debu gger. The interru pt control re[...]

Programmer’s R eference 4-20 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A Figure 4-4 I nterrupt contro l 4.4.1 CM_IRQ_ ST A T (0x10000040 )/CM_FIQ_ST A T (0x1 0000060) The status register con tains the logical AND of the bits in the raw status register and the enable register. 4.4.2 CM_IRQ_ RST A T (0x1000 0044)/CM_FI Q_RST [...]

Programme r’s Reference ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. 4-21 4.4.4 CM_IRQ_ENCLR( 0x1000004 C)/CM_FIQ_ENC LR (0x10000 06C) The clear set locations are used to set bits in the enable register as follows: • clear bits in the enabl e register by writing to the ENCLR locat ion for the required IRQ or F IQ controller[...]

Programmer’s R eference 4-22 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A 4.4.6 CM_SOF T_I NTSET (0x10000 050)/CM_SO F T_ INTCL T (0x10000 054) The core module interrupt controller provides a register for controllin g and clearing software interrupts. This register is accessed using the software interrupt set and software in[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. A-1 Appendix A Signal Descriptions This index prov ides a summary of signals present on the cor e module main co nnectors. It contains the follo wing secti ons: • HDRA on page A-2 • HDRB on page A-4. Note For the Multi-ICE connector pinout and signal descrip tions see JTAG signal[...]

Signal Descriptions A-2 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A A.1 HDRA Figure A-1 shows th e pin number s of th e HDRA plug and s ocket. All pins on the HDRA socket are connected to the correspon ding pins on the HDRA p lug. 1A 0 GND 101 2 GND D0 102 3A 1 D1 103 4 A2 D2 104 5A 3 GND 105 6 GND D3 106 7A 4 D4 107 8 A5 D5 [...]

Signal Descriptions ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. A-3 The signals presen t on th e pins labeled A[31:0], B[31:0] , and C[31:0] are described in Table A-1. Note Table A-1 s hows signal descr iptio ns for an AMB A ASB bus i mplement ation . Table A-1 Bus bit assignme nt (for an AMBA ASB bus ) Pin label Name (ASB) D[...]

Signal Descriptions A-4 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A A.2 HDRB The HDRB plug an d socket have sli ghtly differ ent pin outs, as des cribed belo w. A.2.1 HDRB socket pinout Figure A-2 s hows the p in numbe rs of th e socket HDRB on the under side of th e core module, viewed from ab ove the core module. 1E 0 GND 6[...]

Signal Descriptions ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. A-5 A.2.2 HDRB plug pinout Figur e A-3 shows t he pin number s of th e HDRB plug on the t op of th e core modul e. 1E 1 GND 61 2 GND F0 62 3E 2 F1 63 4 E3 F2 64 5E 0 GND 65 6 GND F3 66 7E 5 F4 67 8 E6 F5 68 9E 7 GND 69 10 GND F6 70 11 E 4 F7 71 12 E9 F8 72 13 E10 [...]

Signal Descriptions A-6 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A A.2.3 Through-board signal connections The signals on the pins labeled E[31:0] are cross-connected between the plug and socket so that the signals are rotated through the stack in groups of four. For example, the fir st block of four are conn ected as sh own [...]

Signal Descriptions ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. A-7 A.2.4 HDRB signal descriptions Table A-3 des cribes t he sig nals on t he pins labeled E[31:0], F[31: 0], and G[1 5:0]. Table A-3 HDRB sig nal description Pin label Name Descrip tion E[31 :28] SYSCLK[3 :0] System cloc k (ASB clock) to each co re modu le/exp an[...]

Signal Descriptions A-8 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A Note Table A-3 shows signal descri ptions for an AMBA ASB bus imp lementati on. G4 TCK JT AG test clock G[3:1] MASTER[2: 0] Master ID. Binary enco ding of the mast er current ly perfo r ming a tra nsfer on th e bus. Correspond s to the mo dule ID and to the A[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. B-1 Appendix B Spe cifica tions This appendix contains the specifications fo r the ARM Integrator/CM940 T core module. It contains th e followin g sections: • Electrical sp ecification on page B-2 • T iming specification on page B-3 • Mechanic al d etails on page B-4.[...]

Specifications B-2 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A B.1 Electrical spec ification Table B-1 shows the core module electrical characteristics for the system bus interface. The core modu le uses 3.3V and 5 V source. The 1 2V inputs are supplied by the motherboard b ut not used by the core modu le. Table B-1 Core m od[...]

Specifications ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. B-3 B.2 T iming speci ficat ion Table B-2 provides the operating timing characteristics for the system bus interface signals. Table B-2 Core m odule tim ing (prelimina ry) Symbol Descri ption Min Max Uni ts F MAX Operating frequ ency - 2 5 MHz T CH Clock HIGH 19 - ns T[...]

Specifications B-4 © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A B.3 Mechanical details The core module i s designed to be stackable on a num ber of different mothe rboards. Its size allows it to be m ounted onto a CompactPC I motherboard while allowin g the motherboard to be installed in a card cage. Figure B-1 shows the mecha[...]

ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. Index-i Index The items in this index are listed in alphab etic order, with symbols and numerics appear ing at the end. The references given are to page numbers. A Abou t th is book feed back xi typogr aph ical co nve ntions ix Access arbitration, SDRAM 3-6 Accesses boot ROM 4-2 SSRA[...]

Index Index-ii © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A Connect ors HDRA and HDRB 1-3 Multi-ICE 2-4 power 2-3 Contro ller clock 1-6, 3 -17 reset 1-5, 3-8 SDRAM 1-5, 3-6 SSRAM 3-3 Contro llers FIQ 4-19 IRQ 4-19 Core module c ontrol register 4-11 Core module FPG A 1-5 Core module ID 2-6 Core module r egisters 4 -7 Core modu [...]

Index ARM DUI 0125A © Copyright ARM Limited 1999. All rights reserved. Index-iii SDRAM op erating mo de 3-6 SDRAM re pe at mapp ing 4-4 SDRAM st atus and co ntrol regi ster 4 -14 SDRAM, SPD memory 4-16 Serial pre sence detec t 3-6 Setting CA S latency 4-1 5 Setting SDRAM size 4 -15 Set up power co nne ct ions 2-3 standalo ne 2-2 Soft ware int e rr[...]

Index Index-iv © Copyright ARM Limited 1999. All rights res erved. ARM DUI 0125A[...]