Measurement-computing STLITE-PCI-8x Uživatelský manuál stáhnout pdf (Strana 16)

previously programmed as input-only are not driven.

Bits 4-7 of this register operate as “Write-1-To-Set.” Writing a “1” to any bit in the upper nibble will drive the

corresponding GPIO bit high even if it has been previously programmed as bi-directional. Bits previously

programmed as input only are not driven.

Writing a “0” to this register has no effect, while reading from this register returns the last value poked in.

GPIO IN Register (0x67 offset of PCI Header) Read Only

D7 D6 D5 D4 D3 D2 D1 D0

X SDO X X RESERVED RESERVED RESERVED RESERVED

GPIO3 GPIO2 GPIO1 GPIO0

This register allows read-back of the serial data (SDO) from either of the two A/D converters used to measure

slot temperature, power supply voltages or fan current.

The lower nibble (bits 0-3) is reserved by the 21150 bridge chip. Reading from this portion of the register will

return all zeros.

NOTE: When reading the upper nibble (bits 4-7), be sure to mask of unwanted bits to avoid

return of incorrect data.

GPIO CNTRL Register (0x66 offset of PCI Header) Read/Write

D7 D6 D5 D4 D3 D2 D1 D0

GPIO3_BI GPIO2_BI GPIO1_BI GPIO0_BI GPIO3_IN GPIO2_IN GPIO1_IN GPIO0_IN

This register configures each of the STLITE-PCI-8T motherboard’s GPIO bits as either bi-directional or input

type.

Bits 0-3 of this register operate in a “Write-1-To-Clear” manner. Writing a “1” to any bit in the lower nibble

will configure the corresponding GPIO bit as input type.

Bits 4-7 of this register operate as “Write-1-To-Set.” Writing a “1” to any bit in the upper nibble will configure

the corresponding GPIO bit as bi-directional.

Writing the value “0” to this register has no effect. Reading from this register returns the last value poked in.

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Measurement-computing STLITE-PCI-8x Uživatelský manuál Strana 16