82371AB Datasheet, PDF (224/284 Pages) Intel Corporation – PCI-TO-ISA / IDE XCELERATOR PIIX4

82371AB (PIIX4)
E
11.3.5.11. Device 10: Generic I/O Device 1
Device 10 monitors a generic I/O device with a programmable IO address or GPI18.
Device 10 System Events:
— PCI accesses to programmable IO addresses, selectable below. This can cause idle,
burst, or global standby timer reloads, IO trap SMI#, or forwarding of the cycle from PCI
to ISA. It can optionally generate a Chip Select signal (PCS1#). The address consists of
a 16-bit base address and 4-bit mask, allowing an address range from
1 to 16 bytes.
— Assertion of GPI18. The polarity of active signal (high or low) is selectable. This can
cause idle, burst, or global standby timer reloads.
Device 10 Address Ranges:
[GDEC_MON_DEV10]
Programmable Base Address:
[BASE_DEV10]
Programmable Mask:
[MASK_DEV10]
Device 10 Idle Timer:
Resolution: 1 second
Count: 5 bit
[IDL_CNTC]
GPI Enable:
[GPI_EN_DEV10]
GPI Polarity Select:
[GPI_POL_DEV10]
Device 10 ISA Forwarding Enable:
[EIO_EN_DEV10]
Chip Select (PCS1#) Enable: [CS_EN_DEV10]
Device 10 Idle Timer Reload:
[IDL_EN_DEV10]
Global Standby Timer Reload:
[GRLD_EN_DEV10]
Burst Timer Reload (Fast Burst Only): [BRLD_EN_DEV10]
Idle Timer Expiration SMI#:
[IDL_EN_DEV10] [IDL_STS_DEV10]
Trap SMI#:
[TRP_EN_DEV10] [TRP_STS_DEV10]
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