CXD1185CQ/CR
When SPPE=“0”
When SPPE=“1”
Software changes
It behaves as a CXD1185AQ. It responds to any selection and issues SPE (SCSI
Parity Error) interrupt (Interrupt request register2 (03 h), bit1)
Does not respond to selection if SCSI parity error is detected.
If SPPE bit is fixed to “0”, it behaves as a CXD1185AQ, hence no software changes are required. Setting
SPPE bit to “1” would eliminate the possibility of SPE interrupt after selection and the routine that deals with
it.
Distinguishing CXD1185AQ and CXD1185C
To distinguish the two by software, follow the steps below.
1. Write “1” to SPPE bit (bit2) of MODE register (0C h).
2. Read SPPE bit (bit2) of MODE register (0C h).
Value of SPPE bit
Chip name
CXD1185AQ
CXD1185C
0
1
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SONY [ SONY CORPORATION ]
