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Index 8Fh

Reserved

Index 90h

GPIO Pin Direction Register 1 (R/W)

Reset Value = 00h

GPIO7 Direction: Selects if GPIO7 is an input or output: 0 = Input; 1 = Output.

GPIO6 Direction: Selects if GPIO6 is an input or output: 0 = Input; 1 = Output.

GPIO5 Direction: Selects if GPIO5 is an input or output: 0 = Input; 1 = Output.

GPIO4 Direction: Selects if GPIO4 is an input or output: 0 = Input; 1 = Output.

GPIO3 Direction: Selects if GPIO3 is an input or output: 0 = Input; 1 = Output.

GPIO2 Direction: Selects if GPIO2 is an input or output: 0 = Input; 1 = Output.

GPIO1 Direction: Selects if GPIO1 is an input or output: 0 = Input; 1 = Output.

GPIO0 Direction: Selects if GPIO0 is an input or output: 0 = Input; 1 = Output.

Note: Several of these pins have specific alternate functions. The direction configured here must be consistent with the pins’ use as

the alternate function.

Index 91h

GPIO Pin Data Register 1 (R/W)

Reset Value = 00h

GPIO7 Data: Reflects the level of GPIO7: 0 = Low; 1 = High.

GPIO6 Data: Reflects the level of GPIO6: 0 = Low; 1 = High.

GPIO5 Data: Reflects the level of GPIO5: 0 = Low; 1 = High.

GPIO4 Data: Reflects the level of GPIO4: 0 = Low; 1 = High.

GPIO3 Data: Reflects the level of GPIO3: 0 = Low; 1 = High.

GPIO2 Data: Reflects the level of GPIO2: 0 = Low; 1 = High.

GPIO1 Data: Reflects the level of GPIO1: 0 = Low; 1 = High.

GPIO0 Data: Reflects the level of GPIO0: 0 = Low; 1 = High.

Note: This register contains the direct values of GPIO[7:0] pins. Write operations are valid only for bits defined as output. Reads from

this register read the last written value if the pin is an output. The pins are configured as inputs or outputs in F0 Index 90h.

Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)

Bit

Description

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