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in error and should not be monitored. This limits the SYM53C040 to only
target applications, with no disconnects, on a wide bus.
To select a high ID for the SYM53C040, connect any of the SCSI high
data lines (8–15) to one of the SHID[2:0] pins. The user can monitor the
value of the SHID[2:0] pins by reading the SHID[2:0] bits in the
Current
SCSI Data High (CSDHI)
register (0xFC08). The
Select Enable High
(SENHI)
register allows a bit to be set that corresponds to the device
SCSI ID. This allows an interrupt to be generated if the corresponding
data line is driven during selection, if the data line is connected to the
appropriate SHIDx pin.
Figure 2.3
on
page 2-7
illustrates SCSI arbitration
and selection/reselection and DMA target transfers.
2-6
Functional Description
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