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Register: 0xFC08
Current SCSI Data High (CSDHI)
Read Only
7
6
SHID2
SHID1
0
0
SHID[2:0]
Current SCSI Data High
The Current SCSI Data High register is a read only
register that allows the microcontroller to read the active
SCSI High ID data bus. This register is used during
arbitration to check for higher priority arbitrating devices.
No parity is generated because only three of the lines are
valid.
R
Reserved
Register: 0xFC0C
Select Enable High (SENHI)
Write Only
7
6
SHID2
SHID1
x
x
SHID[2:0]
SCSI High ID
The Select Enable Register High for the SCSI High ID
lines is a write only register that is used as a mask to
monitor a single ID during a selection attempt. The
simultaneous occurrence of BSY/ false and SEL/ true and
the correct ID bit, will cause an interrupt. This interrupt
can be disabled by resetting all bits in this register and in
the
Select Enable (SER)
generated because only three of the lines are valid.
R
Reserved
5
4
SHID0
Defaults:
0
0
5
4
SHID0
Defaults:
x
0
R
0
0
0
R
0
0
0
register (0xFC04). No parity is
0
0
[7:5]
[4:0]
0
0
[7:5]
[4:0]
4-13
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