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5.71 Port Local AckID Status CSR n (SPn_ACKID_STAT)
SRIO Registers
Each of the four ports is supported by a register of this type (see
). The port local ackID status
CSR n (SPn_ACKID_STAT) is shown in
and described in
.
Table 144. SPn_ACKID_STAT Registers and the Associated Ports
Register
Address Offset
Associated Port
SP0_ACKID_STAT
1148h
Port 0
SP1_ACKID_STAT
1168h
Port 1
SP2_ACKID_STAT
1188h
Port 2
SP3_ACKID_STAT
11A8h
Port 3
Figure 134. Port Local AckID Status CSR n (SPn_ACKID_STAT)
31
29 28
24 23
16
Reserved
INBOUND_ACKID
Reserved
R-0
R/W-0
R-0
15
13 12
8 7
3 4
0
Reserved
OUTSTANDING_ACKID
Reserved
OUTBOUND_ACKID
R-0
R/W-0
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = Value after reset
Table 145. Port Local AckID Status CSR n (SPn_ACKID_STAT) Field Descriptions
Bit
Field
Value
Description
31–29
Reserved
0
These read-only bits return 0s when read.
28–24
INBOUND_ACKID
00000b–11111b
Input port next expected ackID value
23–13
Reserved
0
These read-only bits return 0s when read.
12–8
OUTSTANDING_ACKID
00000b–11111b
Output port unacknowledged ackID status. Next expected acknowledge
control symbol ackID field that indicates the ackID value expected in the
next received acknowledge control symbol.
control symbol ackID field that indicates the ackID value expected in the
next received acknowledge control symbol.
7–5
Reserved
0
These read-only bits return 0s when read.
4–0
OUTBOUND_ACKID
00000b–11111b
Output port next transmitted ackID value. Software writing this value can
force retransmission of outstanding unacknowledged packets in order to
manually implement error recovery.
force retransmission of outstanding unacknowledged packets in order to
manually implement error recovery.
Serial RapidIO (SRIO)
202
SPRUE13A – September 2006