82375EB datasheet(19/131 Pages) INTEL

19 / 131 page

82375EBSB

Pin Name

Type

Description

MEMACK

MEMORY ACKNOWLEDGE

MEMACK

is the response handshake that indicates

to the PCEB that the function requested over the MEMREQ

andor FLSHREQ

signals has been completed

If the PCEB is configured for Guaranteed Access Time Mode through the Arbiter

Control Register and both MEMREQ

and FLSHREQ

are asserted the assertion

of MEMACK

indicates to the PCEB that ownership of main memory has been

granted and that all system buffers have been flushed and temporarily disabled

If MEMACK

is asserted in response to assertion of MEMREQ

(GAT either

enabled or disabled) it indicates that the system’s buffers pointing towards the main

memory are flushed and temporarily disabled so that APIC can proceed with the

interrupt message sequence

If FLSHREQ

is asserted and MEMREQ

is not asserted (with GAT mode being

either enabled or disabled) the assertion of MEMACK

indicates that the system’s

posted write buffers pointing towards PCI are flushed and temporarily disabled and

the EISA Bus can be granted to an EISA master or DMA

This signal is synchronous to the PCI clock

23 Address Decoder Signals

Pin Name

Type

Description

MEMCS

out

MEMORY CHIP SELECT

MEMCS

is a programmable address decode signal

provided to a Host CPU bridge A Host bridge can use MEMCS

to forward a PCI cycle

to the main memory behind the bridge MEMCS

is asserted one PCI clock after

FRAME

is sampled asserted (address phase) and is valid for one clock cycle before

being negated MEMCS

is driven high during reset

PIODEC

PCI IO SPACE DECODER

PIODEC

can be used to provide arbitrarily complex

EISA-to-PCI IO address space mapping This signal can be connected to the decode

select output of an external IO address decoder When PIODEC

is asserted during

an EISA IO cycle that cycle is forwarded to the PCI Bus

Note that an external pull-up resistor is required if this input signal is not used (ie not

driven by the external logic)

82375EB Datasheet(PDF) 19 Page - Intel Corporation

82375EB Datasheet(HTML) 19 Page - Intel Corporation

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