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LPC/FWH Interface Configuration
11-38 Intel® 460GX Chipset Software Developer’s Manual
11.2.9.1 GP Output
Offset: 00-03h
Attribute: Read/Write
Default Value: 00000000h
Size: 32 bits
11.2.9.2 GP Data
Offset: 04-07h
Attribute: Read/Write
Default Value: 00000000h
Size: 32 bits
25 GPIO[19] 5 GPIO[5]
24 GPIO[18] 4 GPIO[4]
23 Reserved 3 GPIO[3]
22 Reserved 2 GPIO[2]
21 Reserved 1 GPIO[1]
20 Reserved 0 GPIO[0]
19 GPIO[13]
18 GPIO[12]
17 GPIO[11]
16 GPIO[10]
Bit GPIO Bit GPIO
Bit Description
31:29 Reserved.
28:24 Mux Output: When set to a ‘0’, the muxed GPIO pin is programmed as an input. When set to ‘1’,
the muxed GPIO pin is programmed as an output. In the GPO mode, this bit cannot be changed
once the GP Lock bit is set. The setting of this bit only has effect if the muxed GPIO is
programmed to be a GPIO.
23:20 Reserved.
19:16 Mux Output: When set to a ‘0’, the muxed GPIO pin is programmed as an input. When set to ‘1’,
the muxed GPIO pin is programmed as an output. In the GPO mode, this bit cannot be changed
once the GP Lock bit is set. The setting of this bit only has effect if the muxed GPIO is
programmed to be a GPIO.
15:9 Reserved.
8:0 Output: When set to a ‘0’, the GPIO pin is programmed as an input. When set to ‘1’, the GPIO pin
is programmed as an output. This bit cannot be changed once the GP Lock bit is set.
Bit Description
31:29 Reserved.
28:24 Muxed Data: If a data bit is programmed to be an output, then this bit can be updated by software
to drive a value on the output pin. If the data bit is programmed as an input, then this bit reflects
the state of the input pin and cannot be updated by software. This bit cannot be changed once the
GP Lock bit is set. The value of this bit only has meaning if the muxed GPIO is enabled as a GPIO.
23:20 Reserved.