IDT 89HPES16NT2, User Manual

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IDT Non-Transparent Mode Operation
PES16NT2 User Manual 10 - 34 April 15, 2008
Notes
PC_PCIELCAP - Port C NTB Mode PCI Express Link Capabilities (0x04C)
2 FED RW1C 0x0 Fatal Error Detected . This bit indicates the status of Fatal
errors. Errors are logged in this registers regardless of
whether error reporting is enabled or not.
3 URD RW1C 0x0 Unsupported Request Detected . This bit indicates the
device received an Unsupported Request. Errors are
logged in this register regardless of whether error reporting
is enabled or not.
4 AUXPD RO 0x0 Aux Power Detected . Devices that require AUX power,
set this bit when AUX power is detected.This device does
not require AUX power, hence the value is hardwired to
zero.
5 TP RO 0x0 Transactions Pending. The transparent bridge does not
issue Non-Posted Requests on its own behalf. Therefore,
this field is hardwired to zero.
15:6 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type
Default
Value
Description
3:0 MAXLNKSPD RO 0x1 Maximum Link Speed . This field is hardwired to 0x1 to
indicate 2.5 Gbps.
9:4 MAXLNK-
WDTH
RWL 0x8 Maximum Link Width . This field indicates the maximum
link width of the given PCI Express link. This field may be
overridden to allow the link width to be forced to a smaller
value. Setting this field to a invalid or reserved value
results in x1 being used.
0 - reserved
1 - (x1) x1 link width
2 - (x2) x2 link width
4 - (x4) x4 link width
8 - (x8) x8 link width
others - reserved
11:10 ASPMS RO 0x1 Active State Power Management (ASPM) Support. This
field is hardwired to 0x1 to indicate L0s Support.
Unlike the other ports, Port C does not support L1 ASPM.
14:12 L0SEL RO see text L0s Exit Latency . This field indicates the L0s exit latency
for the given PCI Express link. This field depends of
whether a common or separate reference clock is used
When separate clocks are used 1 us to 2 us is reported
with a read only value of 0x5.
When a common clock is used 256 ns to 512 ns is
reported with a read-only value of 0x3
Bit
Field
Field
Name
Type
Default
Value
Description