IDT 89HPES64H16G2 User Manual page 254

IDT PCI to PCI Bridge and Proprietary Port Specific Registers
VCR0CTL- VC Resource 0 Control (0x214)
Bit
Field
7:0
15:8
16
19:17
23:20
26:24
30:27
31
VCR0STS - VC Resource 0 Status (0x218)
Bit
Field
15:0
16
PES64H16G2 User Manual
Field Default
Type
Name Value
TCVCMAP bit 0: 0xFF
RO
bits 1
through
7:
RW
Reserved RO 0x0
LPAT RW 0x0
PARBSEL RW 0x0
Reserved RO 0x0
VCID RO 0x0
Reserved RO 0x0
VCEN RO 0x1
Field Default
Type
Name Value
Reserved RO 0x0
PATS RO 0x0
Description
TC/VC Map. This field indicates the TCs that are mapped to the
VC resource.
Each bit corresponds to a TC. When a bit is set, the corresponding
TC is mapped to the VC.
Reserved field.
Load Port Arbitration Table. This bit, when set, updates the port
arbitration logic from the Port Arbitration Table for the VC resource.
In addition, this field is only valid when the Port Arbitration Table is
used by the selected port arbitration scheme (as indicated by a set
bit in the Port Arbitration Select field).
Software sets this bit to signal hardware to update port arbitration
logic with new values stored in Port Arbitration Table; clearing this
bit has no effect. Software uses the Port Arbitration Table Status
bit to confirm whether the new values of Port Arbitration Table are
completely latched by the arbitration logic.
This bit always returns 0 when read.
Port Arbitration Select. This field configures the VC resource to
provide a particular port arbitration service.
The permissible values of this field is a number that corresponds to
one of the asserted bits in the Port Arbitration Capability field of the
VC resource.
If the port arbitration scheme selected in this field is not one of the
supported advertised schemes, the operation of the device is
undefined.
Reserved field.
VC ID. This field assigns a VC ID to the VC resource. For VC0, this
field is always hardwired to zero.
Reserved field.
VC Enable. This field, when set, enables a virtual channel. For
VC0, this field is hardwired to 0x1 (enabled).
Description
Reserved field.
Port Arbitration Table Status. This bit indicates the coherency
status of the port arbitration table associated with the VC resource
and is valid only when the port arbitration table is used by the
selected arbitration algorithm.
This bit is set when any entry of the port arbitration table is written
by software and remains set until hardware finishes loading the
value after software sets the LPAT field in the VCR0CTL register.
16 - 44 April 5, 2013