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VIPER Technical Manual Detailed hardware description
© 2007 Eurotech Ltd Issue E 71
I
2
C
The PXA255 I
2
C interface is brought out to the COMs connector PL4, see 73HPL4 –
COMS ports
, page 376H89, for connection details.
The I
2
C unit supports a fast mode operation of 400Kbits/s and a standard mode of
100Kbits/s.
Fast-mode devices are downward-compatible and can communicate with standard-
mode devices in a 0 to 100Kbits/s I
2
C-bus system. As standard-mode devices,
however, are not upward compatible, they should not be incorporated in a fast-mode
I
2
C-bus system as they cannot follow the higher transfer rate and unpredictable states
will occur.
The I
2
C unit does not support the hardware general call, 10-bit addressing or
CBUS compatibility.
Keep bus loads below 200pF.
TPM
The VIPER provides the option for an Atmel AT97SC3201 Trusted Platform Module
(TPM), which provides full TCG/TCPA V1.1b compatibility. For further details please
contact Eurotech Ltd (see
74H75H377HAppendix A – Contacting Eurotech, page 378H101) for purchasing
information.
When the TPM is fitted OUT6 and OUT7 from the general purpose I/O
interface are not available.
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L