IDT 89HPES64H16G2 User Manual page 223

IDT PCI to PCI Bridge and Proprietary Port Specific Registers
PCIEDCTL - PCI Express Device Control (0x048)
Bit
Field
0
1
2
3
4
7:5
8
9
10
11
14:12
15
PES64H16G2 User Manual
Field Default
Type
Name Value
CEREN RW 0x0
NFEREN RW 0x0
FEREN RW 0x0
URREN RW 0x0
ERO RO 0x0
MPS RW 0x0
ETFEN RW 0x0
PFEN RO 0x0
AUXPMEN RO 0x0
ENS RO 0x0
MRRS RO 0x0
Reserved RO 0x0
Description
Correctable Error Reporting Enable. This bit controls reporting
of correctable errors.
Non-Fatal Error Reporting Enable. This bit controls reporting of
non-fatal errors.
Fatal Error Reporting Enable. This bit controls reporting of fatal
errors.
Unsupported Request Reporting Enable. This bit controls
reporting of unsupported requests.
Enable Relaxed Ordering. When set, this bit enables relaxed
ordering. The switch never sets the relaxed ordering bit in transac-
tions it initiates as a requester.
Max Payload Size. This field sets maximum TLP payload size for
the device.
This field should be set to a value less than that advertised by the
Maximum Payload Size Supported (MPAYLOAD) field in the PCI
Express Device Capabilities (PCIEDCAP) register. Setting this
field to a value larger than that advertised in the MPAYLOAD field
produces undefined results.
0x0 - (s128) 128 bytes max payload size
0x1 - (s256) 256 bytes max payload size
0x2 - (s512) 512 bytes max payload size
0x3 - (s1024) 1024 bytes max payload size
0x4 - (s2048) 2048 bytes max payload size
0x5 - (s4096) 4096 bytes max payload size
0x6 - reserved (treated as 128 bytes)
0x7 - reserved (treated as 128 bytes)
Extended Tag Field Enable. Since the bridge function never gen-
erates a transaction that requires a completion, this bit has no
functional effect on the device during normal operation.
To aid in debug, when the SEQTAG field is set in the TLCTL regis-
ter, this field controls whether tags are generated in the range from
0 through 31 or from 0 through 255.
Phantom Function Enable. The internal bridges within the switch
do not support phantom function numbers. Therefore, this field is
hardwired to zero.
Auxiliary Power PM Enable. The device does not implement this
capability.
Enable No Snoop. The bridge function does not generate transac-
tions with the No Snoop bit set and passes transactions through
the bridge with the No Snoop bit unmodified.
Maximum Read Request Size. The bridge function does not gen-
erate transactions larger than 128 bytes and passes transactions
through the bridge with the size unmodified. Therefore, this field
has no functional effect on the behavior of the bridge.
Reserved field.
16 - 13 April 5, 2013