4-13
Register: 0xFC08
Current SCSI Data High (CSDHI)
Read Only
SHID[2:0]
Current SCSI Data High
[7:5]
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
[4:0]
Register: 0xFC0C
Select Enable High (SENHI)
Write Only
SHID[2:0]
SCSI High ID
[7:5]
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
register (
). No parity is
generated because only three of the lines are valid.
R
Reserved
[4:0]
7
6
5
4
0
SHID2
SHID1
SHID0
R
Defaults:
0
0
0
0
0
0
0
0
7
6
5
4
0
SHID2
SHID1
SHID0
R
Defaults:
x
x
x
0
0
0
0
0
Summary of Contents for Symbios SYM53C040
Page 12: ...xii Preface...
Page 90: ...4 18 SCSI and DMA Registers...
Page 98: ...5 8 SFF 8067 Registers...
Page 110: ...6 12 Two Wire Serial Registers...
Page 126: ...7 16 Miscellaneous Registers...
Page 160: ...8 34 System Registers...
Page 184: ...9 24 Electrical Characteristics...
Page 194: ...A 10 Register Summary...
Page 214: ......