PCT2303N DATA SHEET
CONTROL REGISTERS
!!
GPIO Pin Status
(Register 54h, R/W)
GI[15:10]
13 12
Reserved
GI[5:0]
15
14
11
10
9
8
7
6
5
4
3
2
1
0
Reset settings = xxxxh
The GPIO status register is a read/write register that reflects the state of all GPIO pins (inputs and outputs) on slot
12. The value of all GPIO pin inputs and outputs comes from each frame on slot 12, but is also available for reading
as GPIO pin status through the standard slot 1 and 2 command address/data protocols. GPIO inputs configured as
sticky are cleared by writing a 0 to the corresponding bit of this register. This should be the last event before setting
the AC’97 MLNK bit.
Bits corresponding to unimplemented GPIO pins should be forced to zero in this register and input slot 12.
GPIO bits that have been programmed as inputs and sticky, upon transition (high-to-low or low-to-high), cause the
individual GI bit to go asserted to 1, and remain asserted until a write of 0 to that bit. The only way to set the desired
value of a GPIO output pin is to set the control bit in output slot 12.
If configured as an input, the default value after register reset is always the state of the GPIO pin.
PC-TEL, Inc.
22
2303N0DOCDAT10A-0899
ETC [ ETC ]
