Fujitsu MAN3184 SERIES Specifications page 80

If received pCRC and computed pCRC do not match (i.e., a pCRC error is detected), or if
an improperly formatted data group is transferred, then the INIT creates an attention
condition or before the last transfer of the pCRC field. When the TARG switches to a
MESSAGE OUT phase the INIT sends an INITIATOR DETECTED ERROR message to
the TARG. This message notifies the TARG that data contained within the data group was
invalid.
If the TARG does not retry transferring the information transfer or it exhausts its retry
limit the TARG goes into a STATUS phase and send a CHECK CONDITION status with
a sense key set to ABORTED COMMAND and an additional sense code set to
INITIATOR DETECTED ERROR MESSAGE RECEIVED for the task associated with
the received INITIATOR DETECTED ERROR message.
(d) Data Group Pad field and pCRC field transfer from INIT to TARG
If the I/O signal is false (transfer to the target), the INIT determines the data field transfer is
complete by detecting an assertion of the P_CRCA signal. If the REQ signal is asserted (i.e., pad
field required) the INIT shall first transfer the two pad bytes, then the four pCRC bytes. If the REQ
signal is negated (i.e., no pad field required) the INIT shall transfer the four pCRC bytes.
Pad field data and pCRC field data are transferred using the same negotiated values as the data
field data.
The TARG may continue to send REQs, up to the negotiated offset, for the next data group. The
TARG shall not transition REQ with P_CRCA asserted until the initiator has responded with all
ACK transitions for the previous data group.
When the INIT detects an assertion of the P_CRCA signal and the REQ signal is asserted (i.e., pad
field required), the transmission sequence is the following way.
1) Transfer data bytes for all outstanding REQs received prior to the REQ that had the
P_CRCA signal asserted. INIT drives the DB(15-0) signals to their desired pad values.
2) INIT delays at least one transmit setup time, negates the ACK signal and holds the DB(15-
0) signals valid for a minimum of one transmit hold time and the ACK signal negated for a
minimum of a transmit assertion period.
3) INIT drives the DB(15-0) signals to their desired pCRC values, delays at least one
transmit setup time, asserts the ACK signal and holds the DB(15-0) signals valid for a
minimum of one transmit hold time and the ACK signal asserted for a minimum of a
transmit assertion period.
4) INIT drives the DB(15-0) signals to their desired pCRC values and delays at least one
transmit setup time.
5) INIT negates the ACK signal and holds the DB(15-0) signals valid for a minimum of one
transmit hold time and the ACK signal negated for a minimum of a transmit assertion
period.
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