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Un buon manuale d’uso
Le regole impongono al rivenditore l'obbligo di fornire all'acquirente, insieme alle merci, il manuale d’uso Philips ISP1521. La mancanza del manuale d’uso o le informazioni errate fornite al consumatore sono la base di una denuncia in caso di inosservanza del dispositivo con il contratto. Secondo la legge, l’inclusione del manuale d’uso in una forma diversa da quella cartacea è permessa, che viene spesso utilizzato recentemente, includendo una forma grafica o elettronica Philips ISP1521 o video didattici per gli utenti. La condizione è il suo carattere leggibile e comprensibile.
Che cosa è il manuale d’uso?
La parola deriva dal latino "instructio", cioè organizzare. Così, il manuale d’uso Philips ISP1521 descrive le fasi del procedimento. Lo scopo del manuale d’uso è istruire, facilitare lo avviamento, l'uso di attrezzature o l’esecuzione di determinate azioni. Il manuale è una raccolta di informazioni sull'oggetto/servizio, un suggerimento.
Purtroppo, pochi utenti prendono il tempo di leggere il manuale d’uso, e un buono manuale non solo permette di conoscere una serie di funzionalità aggiuntive del dispositivo acquistato, ma anche evitare la maggioranza dei guasti.
Quindi cosa dovrebbe contenere il manuale perfetto?
Innanzitutto, il manuale d’uso Philips ISP1521 dovrebbe contenere:
- informazioni sui dati tecnici del dispositivo Philips ISP1521
- nome del fabbricante e anno di fabbricazione Philips ISP1521
- istruzioni per l'uso, la regolazione e la manutenzione delle attrezzature Philips ISP1521
- segnaletica di sicurezza e certificati che confermano la conformità con le norme pertinenti
Perché non leggiamo i manuali d’uso?
Generalmente questo è dovuto alla mancanza di tempo e certezza per quanto riguarda la funzionalità specifica delle attrezzature acquistate. Purtroppo, la connessione e l’avvio Philips ISP1521 non sono sufficienti. Questo manuale contiene una serie di linee guida per funzionalità specifiche, la sicurezza, metodi di manutenzione (anche i mezzi che dovrebbero essere usati), eventuali difetti Philips ISP1521 e modi per risolvere i problemi più comuni durante l'uso. Infine, il manuale contiene le coordinate del servizio Philips in assenza dell'efficacia delle soluzioni proposte. Attualmente, i manuali d’uso sotto forma di animazioni interessanti e video didattici che sono migliori che la brochure suscitano un interesse considerevole. Questo tipo di manuale permette all'utente di visualizzare tutto il video didattico senza saltare le specifiche e complicate descrizioni tecniche Philips ISP1521, come nel caso della versione cartacea.
Perché leggere il manuale d’uso?
Prima di tutto, contiene la risposta sulla struttura, le possibilità del dispositivo Philips ISP1521, l'uso di vari accessori ed una serie di informazioni per sfruttare totalmente tutte le caratteristiche e servizi.
Dopo l'acquisto di successo di attrezzature/dispositivo, prendere un momento per familiarizzare con tutte le parti del manuale d'uso Philips ISP1521. Attualmente, sono preparati con cura e tradotti per essere comprensibili non solo per gli utenti, ma per svolgere la loro funzione di base di informazioni e di aiuto.
Sommario del manuale d’uso
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Pagina 1
ISP1521 Hi-Speed Univ ersal Serial Bus hub controller Rev . 03 — 24 November 2004 Product data 1. General description The ISP1521 is a stand-alone Universal Serial Bus (USB) hub controller IC that complies with Univ ersal Serial Bus Specification Rev . 2.0 . It suppor ts data transf er at high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-s[...]
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Pagina 2
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 2 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 2. Features ■ Complies with: ◆ Univ ersal Serial Bus Specification Rev . 2.0 ◆ Adv anced Configuration and P ower Interf ace (ACPI™), OnNow™ an[...]
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Pagina 3
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 3 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 4. Abbreviations A CPI — Advanced Configuration and P ower Interf ace EMI — ElectroMagnetic Interf erence ESD — ElectroStatic Discharge NAK — Not [...]
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Pagina 4
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Pagina 5
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 5 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 7. Pinning inf ormation 7.1 Pinning 7.2 Pin description Fig 2. Pin configuration. ISP1521BE MLD712 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 60 5[...]
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Pagina 6
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 6 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. DP0 4 AI/O upstream f acing por t 0 D+ connection (analog) RPU 5 AI pull-up resistor connection; connect this pin through a resistor of 1.5 k Ω± 5 % to [...]
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Pagina 7
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 7 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. OC4_N 32 AI/I ov ercurrent sense input f or downstream f acing por t 4 (analog/digital) PSW4_N 33 I/O output — power switch control output (open-dr ain) [...]
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Pagina 8
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 8 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. DP3 55 AI/O downstream f acing por t 3 D+ connection (analog) [3] V CC2 56 - transceiver supply v oltage 2 (3.3 V) GND 57 - ground supply DM4 58 AI/O downs[...]
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Pagina 9
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 9 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] The maxim um current the ISP1521 can sink on a pin is 8 mA. [2] Symbol names ending with underscore N (f or example, NAME_N) represent activ e LOW sign[...]
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Pagina 10
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 10 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 8. Functional description 8.1 Analog transceivers The integrated tr ansceivers directly interf ace to USB lines. They can tr ansmit and receiv e serial da[...]
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Pagina 11
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 11 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 8.2.5 Hub repeater A hub repeater is responsible f or managing connectivity on a per packet basis . It implements pack et signaling connectivity and resum[...]
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Pagina 12
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 12 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. The trigger ing v oltage of the POR circuit is 2.03 V nominal. A POR is automatically generated when V CC goes belo w the trigger voltage f or a duration [...]
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Pagina 13
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 13 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 9. Configuration selections The ISP1521 is configured through I/O pins and, optionally , through an external I 2 C-bus , in which case the hub can updat[...]
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Pagina 14
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 14 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 9.1 Configuration through I/O pins 9.1.1 Number of downstream facing por ts T o discount a ph ysical downstream f acing por t, connect pins DP and DM of [...]
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Pagina 15
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 15 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. F or global ov ercurrent detection, an increased v oltage drop is needed f or the ov ercurrent sense device (in this case, a lo w-ohmic resistor). This ca[...]
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Pagina 16
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 16 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. Both analog and digital ov ercurrent modes are suppor ted; see Ta b l e 7 . F or digital ov ercurrent detection, the normal digital TTL lev el is accepted[...]
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Pagina 17
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 17 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 9.2 Device descriptors and string descriptor s settings using I 2 C-bus 9.2.1 Background inf ormation on I 2 C-b us The I 2 C-bus is suitab le for bi-dire[...]
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Pagina 18
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 18 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 9.2.2 Architecture of configurable hub descriptor s The configurab le hub descriptors can be masked in the internal ROM memor y; see Figure 7 . These de[...]
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Pagina 19
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 19 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 9.2.3 ROM or EEPROM map Remark: A 128-byte EEPR OM suppor ts one language ID only , and a 256-b yte EEPROM supports two language IDs. 9.2.4 ROM or EEPROM [...]
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Pagina 20
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 20 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 11 bDescriptorT ype - 03 [2] STRING 12 13 bString - 50 00 P of Philips 14 15 - 68 00 h 16 17 - 69 00 i 18 19 - 6C 00 l 1A 1B - 69 00 i 1C 1D - 70 00 p 1E [...]
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Pagina 21
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 21 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 56 57 - 33 00 3 58 59 - 33 00 3 5A 5B - 37 00 7 5C 5D - 38 00 8 5E 5F - 37 00 7 60 61 - 37 00 7 62 63 - 36 00 6 64 65 - 37 00 7 66 67 - 38 00 8 68 69 - 20[...]
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Pagina 22
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 22 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. A2 A3 - 63 00 c A4 A5 - 6F 00 o A6 A7 - 6E 00 n A8 A9 - 64 00 d AA AB - 75 00 u A C AD - 63 00 c AE AF - 74 00 t B0 B1 - 6F 00 o B2 B3 - 72 00 r B4 B5 - 7[...]
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Pagina 23
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 23 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] If this string descriptor is not suppor ted, this bLength field must be progr ammed with the value 02H. [2] If this string descriptor is not suppor t[...]
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Pagina 24
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 24 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 10. Hub contr oller description Each USB de vice is composed of se ver al independent logic endpoints. An endpoint acts as a ter minus of comm unication ?[...]
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Pagina 25
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 25 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 11. Descriptors The ISP1521 hub controller suppor ts the f ollowing standard USB descriptors: • De vice • De vice_qualifier • Other_speed_configur[...]
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Pagina 26
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 26 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] V alue in units of 2 mA. T able 16: De vice_qualifier descriptor Offset (bytes) Field name V alue (hex) Comments Full-speed High-speed 0 bLength 0A 0[...]
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Pagina 27
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 27 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] V alue in units of 2 ms. T able 19: Interface descriptor Offset (bytes) Field name V alue (hex) Comments Full-speed High-speed 0 bLength 09 09 descrip[...]
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Pagina 28
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 28 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 12. Hub requests The hub must react to a v ariety of requests initiated by the host. Some requests are standard and are implemented by an y USB de vice wh[...]
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Pagina 29
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 29 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] De vice address: 0 to 127. [2] Returned value in b ytes. [3] MSB specifies endpoint direction: 0 = OUT , 1 = IN. The ISP1521 accepts either value. 12[...]
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Pagina 30
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 30 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] Returns vendor-specific data. [2] Returned value in b ytes. [3] F eature selector value; see Ta b l e 2 5 . [4] Do wnstream por t identifier: 1 to N[...]
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Pagina 31
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 31 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 12.3.2 Get device status This request returns two bytes of data; see Ta b l e 2 7 . 12.3.3 Get interface status The request returns two bytes of data; see[...]
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Pagina 32
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 32 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 12.3.6 Get por t status This request returns four bytes of data. The first w ord contains the por t status bits (wP or tStatus), and the next w ord conta[...]
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Pagina 33
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 33 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 12.4 V arious get descriptors bmRequestT ype — 10000000B bmRequest — GET_DESCRIPT OR = 6 2 suspend change 0 no change 1 resume complete 3 ov ercurrent[...]
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Pagina 34
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 34 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 13. Limiting v alues [1] V alid only when supply v oltage is present. [2] T est method availab le on request. [3] Equiv alent to discharging a 100 pF capa[...]
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Pagina 35
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 35 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 15. Static characteristics [1] Irrespectiv e of the number of de vices connected, the v alue of I CC is alwa ys 91 mA in full-speed. [2] Including R pu dr[...]
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Pagina 36
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 36 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] All pins are 5 V tolerant. [2] The b us capacitance (C b ) is specified in pF . T o meet the specification for V OL and the maximum rise time (300 n[...]
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Pagina 37
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 37 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] F or minimum value, the HS termination resistor is disabled and the pull-up resistor is connected. Only during reset, when both the hub and the device[...]
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Pagina 38
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 38 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 16. Dynamic characteristics [1] Recommended accur acy of the clock frequency is 500 ppm f or the crystal. [2] Suggested v alues f or external capacitors w[...]
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Pagina 39
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 39 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. T able 43: Dynamic characteristics: high-speed sour ce electrical characteristics V CC = 3.0 V to 3.6 V; T amb = − 40 ° Ct o+ 7 0 ° C; test circuit Fi[...]
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Pagina 40
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 40 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] Excluding the first tr ansition from idle state. [2] Char acterized only , not tested. Limits guaranteed b y design. [1] Excluding the first tr ansi[...]
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Pagina 41
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 41 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. T PERIOD is the bit duration corresponding with the USB data rate . Full-speed timing symbols hav e a subscript prefix ‘F’, low-speed timing a prefi[...]
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Pagina 42
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 42 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. Full-speed timing symbols hav e a subscript prefix ‘F’, low-speed timing a prefix ‘L ’. Fig 14. Hub differential data dela y and SOP distortion.[...]
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Pagina 43
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 43 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [1] f SCL = 1 ⁄ 64 × f XT AL . [2] Rise time is determined by C b and pull-up resistor v alue R p (typical 4.7 k Ω ). T able 46: Dynamic characterist[...]
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Pagina 44
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 44 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 17. Application inf ormation 17.1 Descriptor configuration selection 17.2 Overcurrent detection limit adjustment F or an ov ercurrent limit of 500 mA per[...]
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Pagina 45
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 45 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 17.3 Self-powered hub configurations Fig 19. Self-powered hub; individual port power switc hing; individual over current detection. PSW1_N PSW2_N TEST_HI[...]
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Pagina 46
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 46 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. Fig 20. Self-powered hub; ganged port power switching; global o vercurrent detection. PSW1_N TEST_HIGH OC1_N 5.1 V ± 3 % POWER SUPPL Y (kick-up) − + 1 [...]
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Pagina 47
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 47 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 18. T est information (1) T ransmitter: connected to 50 Ω inputs of a high-speed differential oscilloscope. Receiver: connected to 50 Ω outputs of a h[...]
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Pagina 48
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 48 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 19. P ackage outline Fig 23. LQFP80 packa ge outline . UNIT A max. A 1 A 2 A 3 b p cE (1) eH E LL p Z y w v θ REFERENCES OUTLINE VERSION EUROPEAN PROJECT[...]
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Pagina 49
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 49 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. 20. Soldering 20.1 Introduction to soldering surface mount pac kages This te xt gives a v er y brief insight to a complex technology . A more in-depth acc[...]
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Pagina 50
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 50 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. • F or packages with leads on tw o sides and a pitch (e): – larger than or equal to 1.27 mm, the f ootprint longitudinal axis is preferred to be paral[...]
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Pagina 51
Philips Semiconductors ISP1521 Hi-Speed USB hub controller Product data Rev . 03 — 24 No vember 2004 51 of 53 9397 750 13702 © Koninklijk e Philips Electronics N.V . 2004. All rights reserved. [3] These tr ansparent plastic packages are e xtremely sensitive to reflo w soldering conditions and must on no account be processed through more than on[...]
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Pagina 52
9397 750 13702 Philips Semiconductors ISP1521 Hi-Speed USB hub controller © Koninklijk e Philips Electronics N.V . 2004. All rights reser v ed. Product data Rev . 03 — 24 No vember 2004 52 of 53 Contact inf ormation For additional inf or mation, please visit http://www.semiconductor s.philips.com . For sales office addresses , send e-mail to: s[...]
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Pagina 53
© K oninklijke Philips Electronics N.V . 2004. Printed in The Netherlands All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be ch[...]