BSP Developer's Guide

VxWorks 5.5
BSP Developer’s Guide
/***************************************************************************
*
* xxxWideXferParamsQuery - get wide data transfer parameters
*
* Updates the wide data transfer parameters suggested in the call to match
* the XXX SCSI controller's capabilities. Transfer width is in the units
* of the WIDE DATA TRANSFER message's transfer width exponent field. This is
* an 8 bit field where 0 represents a narrow transfer of 8 bits, 1 represents
* a wide transfer of 16 bits and 2 represents a wide transfer of 32 bits.
*
* RETURNS: OK
*/
LOCAL STATUS xxxWideXferParamsQuery
(
SCSI_CTRL *pScsiCtrl, /* ptr to controller info */
UINT8 *xferWidth /* suggested transfer width */
)
{
}
/***************************************************************************
*
* xxxXferParamsSet - set transfer parameters
*
* Validate the requested parameters, convert to the XXX SCSI controller's
* native format and save in the current thread for later use (the chip's
* registers are not actually set until the next script activation for this
* thread).
*
* Transfer period is specified in SCSI units (multiples of 4 ns). An offset
* of zero specifies asynchronous transfer.
*
* RETURNS: OK if transfer parameters are OK, else ERROR.
*/
LOCAL STATUS xxxXferParamsSet
(
SCSI_CTRL *pScsiCtrl, /* ptr to controller info */
UINT8 offset, /* max REQ/ACK offset */
UINT8 period /* min transfer period */
)
{
}
/***************************************************************************
*
* xxxWideXferParamsSet - set wide transfer parameters
*
* Assume valid parameters and set the XXX's thread parameters to the
* appropriate values. The actual registers are not written yet, but will
* be written from the thread values when it is activated.
*
* Transfer width is specified in SCSI transfer width exponent units.
*
* RETURNS: OK
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