82375EB datasheet(24/131 Pages) INTEL

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82375EBSB

26 PCEBESC Interface Signals

Pin Name

Type

Description

ARBITRATION AND INTERRUPT ACKNOWLEDGE CONTROL

EISAHOLD

EISA HOLD

EISAHOLD is used by the ESC to request control of the EISA Bus from

the PCEB This signal is synchronous to PCICLK and is driven inactive when

PCIRST

is asserted

EISAHLDA

out

EISA HOLD ACKNOWLEDGE

The PCEB asserts EISAHLDA to inform the ESC that

it has been granted ownership of the EISA Bus This signal is synchronous to the

PCICLK

PEREQ

out

PCI-TO-EISA REQUEST OR INTERRUPT ACKNOWLEDGE

PEREQ

INTA

is a

dual-function signal The signal function is determined by the state of EISAHLDA

INTA

signal

When EISAHLDA is negated this signal is an interrupt acknowledge (ie PEREQ

INTA

asserted indicates to the ESC that the current cycle on the EISA is an interrupt

acknowledge)

When EISAHLDA is asserted this signal is a PCI-to-EISA request (ie PEREQ

INTA

asserted indicates to the ESC that the PCEB needs to obtain the ownership of

the EISA Bus on behalf of a PCI agent)

This signal is synchronous to the PCICLK and it is driven inactive when PCIRST

asserted

STPGNT

out

STOP GRANT ACKNOWLEDGE

STPGNT

is asserted when the PCEB receives a

STOP GRANT PCI special cycle for one PCICLK period This signal is only asserted

when the PCI AD 310 signals equal 00120002h during the first data phase of the PCI

special cycle Data of 00120002h on AD 310 in subsequent data phases during a

PCI special cycle does not result in the assertion of STPGNT

82375EB Datasheet(PDF) 24 Page - Intel Corporation

82375EB Datasheet(HTML) 24 Page - Intel Corporation

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