Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
395
Datasheet Volume Two: Functional Description, February 2014
Integrated I/O (IIO) Configuration Registers
Type:
CFG
PortID:
N/A
Bus:
0
Device:
5Function:0
Offset:
0x840
Bit
Attr
Default
Description
63:34
RV
-
Reserved.
33:30
RW_L
0x8
fifo_cdt_threshold:
The IRP has a FIFO on the inbound path feeding the R2PCIe. This is only a 
staging FIFO to assist in the flow of inbound traffic. This field specifies the 
number of FIFO entries to use in this IRP staging FIFO.
29:28
RW_L
0x1
ncbncs_cdt_threshold:
Number of credits allocated for IIO to UBox NCB and NCS combined. Uses 
entries in R2PCIe BL Pool B.
27:24
RW_L
0x8
idi_cdt_threshold:
Specifies the credits used for
I2U data for VC0
I2U data VC1/VCm
I2U data VCp
DRS to CBox
These use R2PCIe BL Pool A entries.
23:22
RW_L
0x1
qpi_drs_cdt_threshold:
21:20
RW_L
0x1
vc1_cdt_threshold:
Specifies the credits used for VC1 and VCm combined. Uses R2PCIe AD Pool 
A credits.
19:18
RW_L
0x1
vcp_cdt_threshold:
17:14
RW_L
0x9
vc0_wr_cdt_threshold:
13:10
RW_L
0xb
vc0_rd_cdt_threshold:
These are the total credits allocated for read requests for VC0. There are 
three transaction types that can use this pool:
Non-posted read requests (used for remote peer-to-peer)
A credit from this pool will be used to send these.
Posted read requests (used for read requests to HA, either local or remote)
A credit from this pool will be used to send these.
A credit from the vc0_rdp0_cdt_threshold pool will be used.
NDR to Intel
®
QPI requests
A credit from the qpi_ndr_cdt_threshold will be used.
If more than one credit is used, then a credit will be used from this pool too.
The total number of credits reserved for all three types is 12, regardless of 
how these registers are programmed.
9:6
RW_L
0x7
vc0_rd_p0_cdt_threshold:
These represent how many of the vc0_rd_cdt_threshold credits may be used 
for non-posted reads (remote peer-to-peer).
Posted read requests (used for read requests to HA, either local or remote)
A credit from this pool will be used to send these.
A credit from the vc0_rd_cdt_threshold pool will be used.
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