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Finisar AN-2030 manual

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  • Page 1

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 1 1 Application Note AN - 2030 2 Digital Diagnostic Monitoring Interface 3 for SFP Optical Transceivers 4 5 1. Scope and Overview 6 7 This document defines an enhanced digital diagnostic monitoring interface available in 8 Finisar SFP a[...]

  • Page 2

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 2 1 3. Enhanced Digital Diagnostic Interface Definition 2 3 Overview 4 5 The enhanced digital diagnostic interface is a superset of the MOD - DEF interface 6 defined in the SFP MSA document dated September 14, 2000. The 2 - wire interfa[...]

  • Page 3

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 3 1 Figure 3.1: Digital Diagnostic Memory Map 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 Specific Data Field De scriptions 38 39 The information in italics in Table 3.1 indicates [...]

  • Page 4

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 4 Table 3.1 Serial ID: Data Fields – Address A0 1 Data Address Size (Bytes) Name of Field Description of Field BASE ID FIELDS 0 1 Identifier Type of serial transceiver (see table 3.2) 1 1 Ext. Identifier Extended identifier of type of[...]

  • Page 5

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 5 Identifier 1 The identifier value sp ecifies the physical device described by the serial information. 2 This value shall be included in the serial data. The defined identifier values are shown in 3 table 3.2. Finisar SFP modules have [...]

  • Page 6

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 6 1 TABLE 3.3: Connector values 2 Value Description of connector 00h Unknown or unspecified 01h SC 02h Fibre Channel Style 1 copper connector 03h Fibre Channel Style 2 cop per connector 04h BNC/TNC 05h Fibre Channel coaxial headers 06h [...]

  • Page 7

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 7 Transceiver 1 The following b it significant indicators define the electronic or optical interfaces that are 2 supported by the transceiver. At least one bit shall be set in this field. For Fibre Channel 3 transceivers, the Fibre Chan[...]

  • Page 8

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 8 The SONET compliance code bits allow the host to determine with which specifications 1 a SONET transceiver complies. For each bit rate defined in Table 3.5 (OC - 3, OC - 12, 2 OC - 48), SONET specifi es short reach (SR), intermediate [...]

  • Page 9

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 9 BR, nominal 1 The nominal bit rate (BR, nominal) is specified in units of 100 Megabits per second, 2 rounded off to the nearest 100 Megabits per second. The bit rate includes t hose bits 3 necessary to encode and delimit the signal as[...]

  • Page 10

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 10 transceiver technology. It is common for the trans ceiver to support both 50 micron and 1 62.5 micron fiber. 2 3 Length (Copper) 4 This value specifies the minimum link length that is supported by the transceiver while 5 operating in[...]

  • Page 11

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 11 Vendor Rev 1 The vendor revision number (vendor rev) is a 4 - byte field that contains ASCII 2 characters, left - aligned and padded on the right with ASCII spaces (20h), defining the 3 vendor’s product revision number. A value of [...]

  • Page 12

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 12 Options 1 The bits in the option field shall specify the options implemented in the transceiver as 2 described in table 3.6. Standard Finisar SFP transceivers do not implement TX_FAULT 3 or RATE_SELECT, so byte 65 set to 00010010b . [...]

  • Page 13

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 13 1 Date Code 2 The date code is an 8 - byte field that contains the vendor’s date code in ASCII 3 characters. The date code is mandatory. The date code shall be in the format specified 4 by table 3.7. 5 Table 3.7: Date Code 6 7 Data[...]

  • Page 14

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 14 Table 3.8: Diagnostic Monitoring Type 1 Data Address Bits Description 92 7 Reserved for legacy diagnostic implementations. Must be ‘0’ for compilance with this document. 92 6 Digital diagnostic monitoring implemented (described i[...]

  • Page 15

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 15 Enhanced Options 1 “Enhanced Options” is a 1 byte field with 8 single bit in dicators which describe the 2 optional digital diagnostic features implemented in the transceiver. Since transceivers 3 will not necessarily implement a[...]

  • Page 16

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 16 1 Table 3.10: I/O Timing for Soft Control & Status Functions 2 Parameter Symbol Min Max Units Conditions TX_DISABLE assert time t_off 100 ms Time from TX_DISABLE bit set 1 until optical output falls below 10% of nominal TX_DISABL[...]

  • Page 17

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 17 1 Diagnostics 2 2 wire serial bus address 1010001X (A2h) is used to access measurements of 3 transceiver temperature, internally measured supply voltage, TX bias current, TX out put 4 power, received optical power, and two additional[...]

  • Page 18

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 18 calibrated to absolute units using the most representative fiber output type. 1 Accuracy is ±3dB. Data is not valid when the transmitter is disabled. 2 5) Measured RX received average optical power in mW. Represent ed as a 16 bit 3 [...]

  • Page 19

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 19 External Calibration 1 Measurements are raw A/D values and must be converted to real units using calibration 2 constants stored in EEPROM locations 56 – 95 at 2 wire serial bus address A2h (see 3 Table 3.15) . Calibration is valid [...]

  • Page 20

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 20 5) Measured received optical power. Received power, RX_PWR, is given in µW by 1 the following equation: 2 Rx_PWR (µW) = Rx_PWR(4) * Rx_PWR AD 4 (16 bit unsigned integer) + 3 Rx_PWR(3)*Rx_PWR AD 3 (16 bit unsigned integer) + Rx_PWR([...]

  • Page 21

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 21 Calibration Constants 1 2 TABLE 3.1 5 : Calibra tion constants for External Calibration Option 3 (2 Wire Address A2h) 4 5 Address # Bytes Name Description 56 - 59 4 Rx_PWR(4) Single precision floating point calibration data - Rx opti[...]

  • Page 22

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 22 The slope constants at addresses 76, 80,84, and 88, are unsigned fixed - point binary 1 numbers. The slope will therefore always be positive. The binary point is in between 2 the upper and lower bytes, i.e., between the eight and nin[...]

  • Page 23

    AN - 2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 23 1 Table 3.16c: IEEE - 754 Single - Precision Floating Point Number Format 2 FUNCTION SIGN EXPONENT MANTISSA BIT 31 30……………………23 22……………………………………………………………0 BYTE 3 2 1 0 ß [...]

  • Page 24

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 24 Real Time Diagnostic Registers TABLE 3. 17 : A/D Values and Status Bits (2 Wire Address A2h) Byte Bit Name Descriptio n Converted analog values. Calibrated 16 bit data. 96 All Temperature MSB Internally measured module temperature. [...]

  • Page 25

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 25 110 1 LOS Digital state of the LOS Output Pin. Updated within 100msec of change on pin. This function is implemented in all Fin isar transceivers with digital diagnostic capability. 110 0 Data_Ready_Bar Indicates transceiver has ach[...]

  • Page 26

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 26 Table 3. 18 : Alarm and Warning Flag Bits (2 - Wire Address A2h) Reserved Optional Alarm and Warning Flag Bits 112 7 Temp High Alarm Set when internal temperature exceeds high alarm level. 112 6 Temp Low Alarm Set when internal temp[...]

  • Page 27

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 27 Bytes 123 – 126 contain write - only RAM for entry of a 32 bit password that allows access to user writable EEPROM at locations 128 - 247. The default password for Finisar devices is 0, however it can be set to any value at the fa[...]

  • Page 28

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 28 4. DDTC Electrical Interface Definition Overview The Digital Diagnostics Transceiver Controller (DDTC) IC manages all system monitoring functions in the SFP transceiver module. The DDTC is accessed through a 2 - wire serial interfac[...]

  • Page 29

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 29 2 - Wire Interface Reset : After any interruption in protocol, power loss, or system reset, the following steps reset the DDTC . 1. Clock up to nine cycles. 2. Look for SDA high in each cycle while SCL is high. 3. Create a Start Con[...]

  • Page 30

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 30 Acknowledge Polling : Once the internally - timed write has started and the DDTC inputs are disabled, acknowledge polling can be initiated. The process involves transmitting a start condition followed by the device address. The R/W [...]

  • Page 31

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 31 Detailed 2 - Wir e Serial Port Operation This section gives a more detailed description of 2 - wire theory of operation. The 2 - wire serial port interface supports a bi - directional data transmission protocol with device addressin[...]

  • Page 32

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 32 Within the bus specifications a regular mode (10 0 kHz clock rate) and a fast mode (400 kHz clock rate) are defined. The DDTC works in both modes. 5) Acknowledge : Each receiving device, when addressed, is obliged to generate an Ack[...]

  • Page 33

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 33 of the command/control byte (R/W) defines the operation to be performed. When set to a 1 a read operation is selected, and when set to a 0 a write operation is selected. Following the START condition, the DDTC monitors the SDA bus c[...]

  • Page 34

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 34 DC ELECTRICAL CHARACTERISTICS ( Vcc = 3.15V to 3.60V) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES Input Leakage (SDA, SCL) I LI - 1 +1 µ A 2 Input Logic 1 (SDA, SCL) V IH 0.7Vcc Vcc+0.5 V 1 Input Logic 0 (SDA, SCL) V IL GND [...]

  • Page 35

    AN - 2030: Digital Diagn ostic Monitoring Interface for Optical Transceivers F i n i s a r 9/26/02 Revision D Page 35 For More Information Finisar Corporation 1308 Moffett Park Drive Sunnyvale, CA 94089 - 1133 Tel. (408) 548 - 1000 Fax (408) 541 - 6138 sales@finisar.com www.finisar.com[...]