Pci Express Virtual Channel Capability - Renesas IDT 89HPES48H12G2 User Manual

IDT PCI to PCI Bridge and Proprietary Port Specific Registers

PCI Express Virtual Channel Capability

PCIEVCECAP - PCI Express VC Enhanced Capability Header (0x200)
Bit
Field Name
15:0
19:16 CAPVER
31:20 NXTPTR
PVCCAP1- Port VC Capability 1 (0x204)
Bit Field
Field Name
2:0 EVCCNT
3 Reserved
6:4 LPEVCCNT
7 Reserved
9:8 REFCLK
11:10 PATBLSIZ
31:12 Reserved
PVCCAP2- Port VC Capability 2 (0x208)
Bit
Field Name
7:0 VCARBCAP
23:8 Reserved
PES48H12G2 User Manual
Field Default
Type
Value
CAPID RO 0x2
RO 0x1
RWL Refer to sec-
tion Capabil-
ity Structures
on page 15-3
Default
Type
Value
RWL 0x0
RO 0x0
RWL 0x0
RO 0x0
RO 0x0
RWL 0x2
RO 0x0
Field Default
Type
Value
RO 0x0
RO 0x0
Description
Capability ID. The value of 0x2 indicates a virtual channel capabil-
ity structure.
Capability Version. The value of 0x1 indicates compatibility with
version 1 of the specification.
Next Pointer. Next capability pointer. The value of 0x0 terminates
the list.
Description
Extended VC Count. A value 0x0 indicates that only the default
VC (VC0) is implemented.
Reserved field.
Low Priority Extended VC Count. Not applicable (only the default
VC 0 is implemented).
Reserved field.
Reference Clock. Not supported (i.e., Time-based WRR Port Arbi-
tration is not implemented).
Port Arbitration Table Entry Size. This field indicates the size of
the port arbitration table in the device. It is set to 0x2 to indicate a
table with 4-bit entries.
0x0 - (bit1) Port arbitration table is 1-bit
0x1 - (bit2) Port arbitration table is 2-bits
0x2 - (bit4) Port arbitration table is 4-bits
0x3 - (bit8) Port arbitration table is 8-bits
Reserved field.
Description
VC Arbitration Capability. Not applicable (only the default VC 0 is
implemented).
Reserved field.
16 - 42 April 5, 2013