XIO2000AI datasheet(127/159 Pages) TAOS

127 / 159 page

PCI Express Extended Configuration Space

117

April 2007 Revised October 2008

SCPS155C

5.28 Port Arbitration Table (VC1)

The port arbitration table is provided to allow software to define round-robin weighting for traffic entering the

PCI interface. The table is divided into 128 phases.

PCI Express extended register offset:

1C0h – 1FCh

Read/Write

Default value:

0000 0000h

Table 5−25. Port Arbitration Table

OFFSET

Phase 7

Phase 6

Phase 5

Phase 4

Phase 3

Phase 2

Phase 1

Phase 0

1C0h

Phase 15

Phase 14

Phase 13

Phase 12

Phase 11

Phase 10

Phase 9

Phase 8

1C4h

Phase 23

Phase 22

Phase 21

Phase 20

Phase 19

Phase 18

Phase 17

Phase 16

1C8h

Phase 31

Phase 30

Phase 29

Phase 28

Phase 27

Phase 26

Phase 25

Phase 24

1CCh

Phase 39

Phase 38

Phase 37

Phase 36

Phase 35

Phase 34

Phase 33

Phase 32

1D0h

Phase 47

Phase 46

Phase 45

Phase 44

Phase 43

Phase 42

Phase 41

Phase 40

1D4h

Phase 55

Phase 54

Phase 53

Phase 52

Phase 51

Phase 50

Phase 49

Phase 48

1D8h

Phase 63

Phase 62

Phase 61

Phase 60

Phase 59

Phase 58

Phase 57

Phase 56

1DCh

Phase 71

Phase 70

Phase 69

Phase 68

Phase 67

Phase 66

Phase 65

Phase 64

1E0h

Phase 79

Phase 78

Phase 77

Phase 76

Phase 75

Phase 74

Phase 73

Phase 72

1E4h

Phase 87

Phase 86

Phase 85

Phase 84

Phase 83

Phase 82

Phase 81

Phase 80

1E8h

Phase 95

Phase 94

Phase 93

Phase 92

Phase 91

Phase 90

Phase 89

Phase 88

1ECh

Phase 103

Phase 102

Phase 101

Phase 100

Phase 99

Phase 98

Phase 97

Phase 96

1F0h

Phase 111

Phase 110

Phase 109

Phase 108

Phase 107

Phase 106

Phase 105

Phase 104

1F4h

Phase 119

Phase 118

Phase 117

Phase 116

Phase 115

Phase 114

Phase 113

Phase 112

1F8h

Phase 127

Phase 126

Phase 125

Phase 124

Phase 123

Phase 122

Phase 121

Phase 120

1FCh

Each phase consists of a four-bit field as indicated below.

BIT NUMBER

RESET STATE

Table 5−26. Port Arbitration Table Entry Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

3:0

PORT_SELECT

Port arbitration select. This 4-bit field is used by software to identify the port ID (secondary PCI

device) that must be allocated to this slot of arbitration bandwidth depending upon the port

arbitration scheme enabled. The default value for this field is 0h.

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