CXD1185CQ/CR
2. The command complete with ACK inactive if :
· phase change occurs and PHC bit in interrupt request register 2 is set to “1”.
If this is the case and the DMA bit is set to “1”, the DRQ signal also remains inactive.
· while the transfer byte counter is in use :
the DMA bit is set to “1”, the status register TRBZ bit is set to “1” and the FIFO status register FIE bit is
set to 1, or in receive mode, the DMA bit is set to “0” and the status register TRBZ bit is set to “1”.
· while executing a single byte transfer :
the mode is send and the FIE bit is set to 1,
or the mode is receive, FIFO status register bits FC3-FC0 are all set to “1”.
3. The command complete with ACK active if :
· the mode is receive and a parity error occurs on the SCSI bus.
(However, this is not the case if the mode register HSPE bit is set to “0”.)
· status is message-in phase, the TRBE bit is set to “0”, the REQ signal is active and a 1-byte message is
received.
Note that in the above two cases the “Deassert ACK” command must be executed afterwards.
4. Handshaking is temporarily interrupt with ACK inactive if :
· while the transfer byte counter is in use :
the mode is send and the FIFO status register FIE bit is set to “1”.
· during synchronous transfer, the difference in the number of REQ and ACK reaches the offset specified
in the synchronous transfer register.
· the mode is receive, during synchronous transfer, the number of FIFO bytes remaining is fewer than the
offset specified in the synchronous transfer register.
5. Handshaking is temporarily interrupt with ACK active if :
· while the transfer byte counter is in use :
the mode is receive and the FIFO status register FIF bit is set to “1”.
• Transfer Information
In the initiator mode, causes data transfer to take place.
• Transfer Pad
In the initiator mode, causes data transfer to take place.
Note that unlike “Transfer Information”, the data output by the CXD1185C are all “0”s and parity generation
is not performed.
In addition, no parity check is performed on any data input to the CXD1185C.
Except for these two exceptions, this command is identical to the “Transfer Information” command.
• Deassert ACK
Makes the SCSI ACK signal inactive.
• Assert ATN
Makes the SCSI ATN signal active.
• Deassert ATN
Makes the SCSI ATN signal inactive. After executing the “Select with ATN” or “Assert ATN” command, the
SCSI bus ATN signal remains active until this command is executed.
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SONY [ SONY CORPORATION ]
