PI7C7300DNA datasheet(72/107 Pages) PERICOM

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PI7C7300D

3-PORT PCI-TO-PCI BRIDGE

Page 72 of 107

Pericom Semiconductor

November 2005 - Revision 1.01

When S1_RESET# or S2_RESET# is asserted by means of the secondary reset bit,

PI7C7300D remains accessible during secondary interface reset and continues to respond

to accesses to its configuration space from the primary interface.

SUPPORTED COMMANDS

The PCI command set is given below for the primary and secondary interfaces.

13.1

PRIMARY INTERFACE

P_CBE [3:0] #

Command

Action

0000

Interrupt

Acknowledge

Ignore

0001

Special Cycle

Do not claim. Ignore.

0010

I/O Read

If address is within pass through I/O range, claim and

pass through.

Otherwise, do not pass through and do not claim for

internal access.

0011

I/O Write

Same as I/O Read.

0100

Reserved

-----

0101

Reserved

-----

0110

Memory Read

If address is within pass through memory range, claim

and pass through.

If address is within pass through memory mapped I/O

range, claim and pass through.

Otherwise, do not pass through and do not claim for

internal access.

0111

Memory Write

Same as Memory Read.

1000

Reserved

-----

1001

Reserved

-----

1010

Configuration Read

Type 0 Configuration Read:

If the bridge’s IDSEL line is asserted, perform function

decode and claim if target function is implemented.

Otherwise, ignore. If claimed, permit access to target

function’s configuration registers. Do not pass through

under any circumstances.

II. Type 1 Configuration Read:

If the target bus is the bridge’s secondary bus: claim

and pass through as a Type 0 Configuration Read.

If the target bus is a subordinate bus that exists behind

the bridge (but not equal to the secondary bus): claim

and pass through as a Type 1 Configuration Read.

Otherwise, ignore.

1011

Configuration Write

Type 0 Configuration Write: same as Configuration

Read.

II. Type 1 Configuration Write (not special cycle

request):

If the target bus is the bridge’s secondary bus: claim

and pass through as a Type 0 Configuration Write

If the target bus is a subordinate bus that exists behind

the bridge (but not equal to the secondary bus): claim

and pass through unchanged as a Type 1 Configuration

Write.

Otherwise, ignore.

III. Configuration Write as Special Cycle Request

(device = 1Fh, function = 7h)

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