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Struck Documentation
SIS8300-KU
MTCA.4 Digitizer
Page 34 of 92
7.5.6 Firmware Options register
#define SIS8300KU_PCIE_STATUS_REG
0x07
This register holds the information of the PCI Express Link.
Bit read Function
31
reserved
30
...
...
...
13
reserved
12
reserved
11
0
10
PCI Express Link Max_Payload_Size bit 2
9
PCI Express Link Max_Payload_Size bit 1
8
PCI Express Link Max_Payload_Size bit 0
7
0
6
PCI Express Link negotiated Speed bit 2
5
PCI Express Link negotiated Speed bit 1
4
PCI Express Link negotiated Speed bit 0
3
PCI Express Link negotiated Width bit 3
2
PCI Express Link negotiated Width bit 2
1
PCI Express Link negotiated Width bit 1
0
PCI Express Link negotiated Width bit 0
PCI Express Link Max_Payload_Size
bits 2:0 Maximum payload size
000
128 bytes
001
256 bytes
010
512 bytes
011
1024 bytes
100
2048 bytes
101
4096 bytes
PCI Express Link negotiated Speed
bits 2:0 Negotiated Speed
001
Gen1: 2.5 GT/s
010
Gen2: 5 GT/s
100
Gen3: 8 GT/s
PCI Express Link negotiated Width
bits 2:0 Negotiated Width
0001
x1: 1 lane
0010
x2: 2 lanes
0100
x4: 4 lanes
1000
x8: 8 lanes (not possible)