IDT 89HPES16T4G2, Preliminary User'S Manual

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IDT Configuration Registers
PES16T4G2 User Manual 8 - 48 January 28, 2013
Notes
VCR0CAP- VC Resource 0 Capability (0x210)
VCR0CTL- VC Resource 0 Control (0x214)
Bit
Field
Field
Name
Type Default
Value
Description
7:0 PARBC RO Upstream:
0x3
Down-
stream:
0x1
Port Arbitration Capability. This field indicates the type of port
arbitration supported by the VC. Each bit corresponds to a Port
Arbitration capability. When more than one arbitration scheme is
supported, multiple bits may be set.
The upstream port supports hardware fixed round robin and
weighted round robin with 32 phases.
Downstream ports support only hardware fixed round robin.
bit 0 - hardware fixed round robin
bit 1 - weighted round robin with 32 phases
bit 2 - weighted round robin with 64 phases
bit 3 - weighted round robin with 128 phases
bit 4 - time-based weighted round robin with 128 phases
bit 5 - weighted round robin with 256 phases
13:8 Reserved RO 0x0 Reserved field.
14 APS RO 0x0 Advanced Packet Switching. Not supported.
15 RJST RO 0x0 Reject Snoop Transactions. No supported for switch ports.
22:16 MAXTS RO 0x0 Maximum Time Slots. Since this VC does not support time-based
WRR, this field is not valid.
23 Reserved RO 0x0 Reserved field.
31:24 PATBLOFF RO Upstream:
0x2
Down-
stream:
0x0
Port Arbitration Table Offset. This field contains the offset of the
port arbitration table from the base address of the Virtual Channel
Capability structure in double quad words (16 bytes).
The upstream port has a port arbitration table. Downstream ports
do not have a port arbitration table.
Bit
Field
Field
Name
Type
Default
Value
Description
7:0 TCVCMAP bit 0 RO
bits 1
through 7
RW
0xFF 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.
15:8 Reserved RO 0x0 Reserved field.
16 LPAT RW 0x0 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 Arbitra-
tion Table is used by the selected Port Arbitration scheme (that is
indicated by a set bit in the Port Arbitration Capability field
selected by Port Arbitration Select).
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 only has an effect in the upstream port.
This bit always returns 0 when read.