PCI EXPRESS BASE SPECIFICATION, REV 1.0a
4
2.3. H
ANDLING OF
R
ECEIVED
TLP
S
...................................................................................... 76
2.3.1. Request Handling Rules ........................................................................................ 79
2.3.2. Completion Handling Rules .................................................................................. 89
2.4. T
RANSACTION
O
RDERING
.............................................................................................. 90
2.4.1. Transaction Ordering Rules.................................................................................. 90
2.4.2. Update Ordering and Granularity Observed by a Read Transaction .................. 93
2.4.3. Update Ordering and Granularity Provided by a Write Transaction .................. 94
2.5. V
IRTUAL
C
HANNEL
(VC) M
ECHANISM
.......................................................................... 95
2.5.1. Virtual Channel Identification (VC ID) ................................................................ 97
2.5.2. TC to VC Mapping ................................................................................................ 98
2.5.3. VC and TC Rules................................................................................................... 99
2.6. O
RDERING AND
R
ECEIVE
B
UFFER
F
LOW
C
ONTROL
...................................................... 100
2.6.1. Flow Control Rules ............................................................................................. 101
2.7. D
ATA
I
NTEGRITY
......................................................................................................... 110
2.7.1. ECRC Rules......................................................................................................... 110
2.7.2. Error Forwarding ............................................................................................... 114
2.8. C
OMPLETION
T
IMEOUT
M
ECHANISM
........................................................................... 116
2.9. L
INK
S
TATUS
D
EPENDENCIES
....................................................................................... 117
2.9.1. Transaction Layer Behavior in DL_Down Status............................................... 117
2.9.2. Transaction Layer Behavior in DL_Up Status .................................................... 118
3. DATA LINK LAYER SPECIFICATION .......................................................................... 119
3.1. D
ATA
L
INK
L
AYER
O
VERVIEW
.................................................................................... 119
3.2. D
ATA
L
INK
C
ONTROL AND
M
ANAGEMENT
S
TATE
M
ACHINE
....................................... 121
3.2.1. Data Link Control and Management State Machine Rules................................. 122
3.3. F
LOW
C
ONTROL
I
NITIALIZATION
P
ROTOCOL
................................................................ 123
3.3.1. Flow Control Initialization State Machine Rules................................................ 125
3.4. D
ATA
L
INK
L
AYER
P
ACKETS
(DLLP
S
) ........................................................................ 128
3.4.1. Data Link Layer Packet Rules............................................................................. 128
3.5. D
ATA
I
NTEGRITY
......................................................................................................... 132
3.5.1. Introduction......................................................................................................... 132
3.5.2. LCRC, Sequence Number, and Retry Management (TLP Transmitter).............. 133
3.5.3. LCRC and Sequence Number (TLP Receiver) .................................................... 145
4. PHYSICAL LAYER SPECIFICATION ............................................................................ 151
4.1. I
NTRODUCTION
............................................................................................................. 151
4.2. L
OGICAL
S
UB
-
BLOCK
................................................................................................... 151
4.2.1. Symbol Encoding................................................................................................. 152
4.2.2. Framing and Application of Symbols to Lanes ................................................... 155
4.2.3. Data Scrambling ................................................................................................. 158
4.2.4. Link Initialization and Training .......................................................................... 159
4.2.5. Link Training and Status State Machine (LTSSM) Descriptions ........................ 167
4.2.6. Link Training and Status State Rules .................................................................. 170
4.2.7. Clock Tolerance Compensation .......................................................................... 200
4.2.8. Compliance Pattern............................................................................................. 201
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