CP690
Hotswap
ID 20955, Rev. 03
© 2002 PEP Modular Computers GmbH
Page 4 - 9
4.2.6.3
GPIO Output Data Register - Offset 65h
This section describes the GPIO output data register.
Dword address = 64h
Byte enable p_cbe_1<3:0> = xx0xb
Table 4-5: GPIO Output Data Register - Offset 65h
Dword Bit
Name
R/W
Description
11:8
GPIO output
enable write-1-to-
clear
R/W1TC
The gpio<3:0> pin output data
write-1-to-clear. Writing 1 to any of these bits drives the corre-
sponding bit low on the gpio<3:0> bus if it is programmed as bi-
directional. Data is driven on the PCI clock cycle following com-
pletion of the
configuration write to this register. Bit positions corresponding to
gpio pins that are programmed as input only are not driven.
Writing 0 to these bits has no effect.
When read, reflects the last value written.
Reset value: 0.
15:12
GPIO output
enable write-1-to-
set
R/W1TS
The gpio<3:0> pin output data
write-1- to-set. Writing 1 to any of these bits drives the corre-
sponding bit high on the gpio<3:0> bus if it is programmed as bi-
directional. Data is driven on the PCI clock cycle following com-
pletion of the
configuration write to this register. Bit positions corresponding to
gpio pins that are programmed as input only are not driven.
Writing 0 to these bits has no effect.
When read, reflects the last value written.
Reset value: 0.
