Intel B940 Datasheet Page 357

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Datasheet, Volume 2 357
Intel
®
QuickPath Architecture System Address Decode Register Description
3.8 Intel
®
QPI Physical Layer Registers
3.8.1 QPI_0_PH_CPR, QPI_1_PH_CPR
This is the Intel QPI Physical Layer Capability Register.
Device: 2
Function: 1
Offset: 68h
Access as a Dword
Bit Type
Reset
Value
Description
31:30 RV Reserved
29 RO
LFSR_POLYNOMIAL.
Agent's ITU polynomial capability for loopback.
28:24 RO
NUMBER_OF_TX_LANES
Number of Tx lanes with which an implementation can operate for full
width.
Bit 28 – If set, 20 lanes.
The bit indicating the maximum lanes will determine the number of
control/status bits implemented in Tx/Rx Data lane Control/Status
Registers.
23 RO
PRBS_CAPABILITY
If set, implementation is capable of using specified pattern in
bitlock/retraining.
22 RO
SCRAMBLE_CAPABILITY
If set, implementation is capable of data scrambling/descrambling with
LFSR.
21:20 RO
RAS_CAPABILITY
Any of these bits set indicates Alternate Clock RAS capability available
and that corresponding control bits in QPI_*_PH_CTR are implemented.
19:18 RV Reserved
17:16 RO
DETERMINISM_SUPPORT
Determinism supported mode of operations.
Bit 17 =If set, Master mode of operation supported. Component
Specification or equivalent document should contain the
information about PhyL0Synch.
Bit 16 = If set, Slave mode of operation supported.
15:11 RV 0 Reserved
10:8 RO
LINK_WIDTH_CAPABILITY
Bit 8: If set, Full Width capable.
7:5 RO 0
DEBUG_CAPABILITY
Bit7 =If set, an implementation is not capable of extracting slave
electrical parameter from TS.Loopback and apply during the test.
Bit 6 =If set, an implementation is not capable of running in Compliance
slave mode as well as transitioning to Loopback.Pattern from
Compliance state.
Bit 5 =If set, an implementation is not capable of doing Loopcount Stal
4RO0
RETRAIN_GRANULARITY
If set, implementation is capable of 16UI granularity in retraining
duration.
3:0 RO
PHY_VERSION
This is the Intel QPI Phy version.
0 = Current Intel QPI version 0.
Others = Reserved.
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