Figure 1.37 Read Stream And Write Flow - Fujitsu MBA3073 SERIES Technical Manual

Read Stream
REQ 0
DB15-0
P_CRCA 0
<Earliest assertion of P_CRCA>
Target should not assert the P_CRCA
signal until a minimum of a flow
control transmit hold time after the
end of the previous IU.
Write Flow
REQ
ACK
Invalid
Data
Data
P_CRCA
<Earliest assertion of P_CRCA>
Target should not assert the P_CRCA
signal until a minimum of a
control transmit hold time
end of the previous IU.
(5) Deskewing
The deskewing is a technique to compensate incoming Data and REQ/ACK signal skew. The
deskewing is done during training sequence, and it adjust the timing of P1, P_CRCA and DB(15-
0) to be optimum against REQ/ACK. The deskewing is only enabled in paced transfers.
1-23
The assertion of the REQ
signal corresponding to
the last iuCRC transfer
last packet of data stream
(if Pad is not required)
Flow control
setup time
The assertion of the REQ
signal corresponding to
the last iuCRC transfer
Valid Data
Flow Control Setup Time
flow
after the

Figure 1.37 READ STREAM and WRITE FLOW

iuCRC iuCRC
Flow control
hold time
Last iuCRC
<Slowest negation of P_CRCA>
P_CRCA signal a minimum of a
flow control transmit setup time
before the start of the next IU.
<Slowest negation of P_CRCA>
Target should negate the
P_CRCA signal a minimum of a
flow control transmit setup time
before the start of the next IU.
Invalid Data
Don't Care
Target should negate the
C141-C007