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UM082 RTM311 User Manual
r1.3
UM082
www.abaco.com
page 27 of 28
7.12 Appendix A:
CPLD Register map
Register
R/W
Description
0x00
RO
Version Register
Bit 7..0
“0x01” initial release with basic functions
0x01
WO
Command Register 1
Bit 0
Clear the interrupt register
Bit 1
Test the interrupt inputs
Bit 2
Optional local reset
Bit 3
Reset USB3.0 hub
Bit 4
Reset ETH PHY1
Bit 5
Reset ETH PHY2
Bit 6-7
Reserved
0x02
R/W
Command Register 2
Bit 0
Configure M.2 device to SATA or PCIe
•
‘1’ PCIe
•
‘0’ SATA (Default)
Bit 1
Enable M.2 device
’s sleep mode
Bit 2
Enable I2C mode in DisplayPort driver
Bit 3
Enable SM bus mode in SATA driver
Bit 4-7
Reserved
0x03
RO
Interrupt Register
Bit 0
Interrupt from ETH PHY1
Bit 1
Reserved
Bit 2
M.2’s I2C alert
Bit 3 - 7
Reserved
0x04
RO
Status Register
Bit 0
1.1V rail is present
Bit 1
1.8V rail is present
Bit 2
DisplayPort is detected
Bit 3
SD card is detected