Adapter Host Registers

A.2.2 Channel Parameter Register±CH_PARM @ Base_Address + 4 (Host)

This is used to pass parameter information for HOST_CMD register com- mands as follows:

- GO (Tx GO): Load CH_PARM with the address of the first transmit list be- fore issuing the command. The list must be located on an 8-byte address boundary (three LSBs must be 0).

- GO (Rx GO): Load CH_PARM with the address of the first receive list be- fore issuing the command. The list must be located on an 8-byte address boundary (three LSBs must be 0).

Load CH_PARM and write the GO bit with no intervening DIO accesses, as the DIO_DATA and CH_PARM registers share a common holding register. Driver writers must ensure that the code that loads CH_PARM and writes the GO bit is noninterruptable. Otherwise, an intervening DIO could occur, corrupting the list address and resulting in unpredictable operation.

When read, the LSB of the CH_PARM register indicates the operating mode of the PCI output buffers (5 V or 3 V) for diagnostic purposes. A value of 1 indi- cates 5-V operation, a value 0 indicates 3-V operation.

In an adapter check, CH_PARM contains the cause of the adapter check (refer to Adapter Check Interrupt. Int_type = 110b and Int_Vec ￿ 00h, subsection 4.4.8).

Register Definitions

A-17

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Texas Instruments TNETE110A, TNETE211, TNETE100A manual Channel Parameter Register±CHPARM @ BaseAddress + 4 Host
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TNETE110A, TNETE211, TNETE100A specifications

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