PI7C7300 datasheet(13/109 Pages) PERICOM

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PI7C7300A

3-PORT PCI-TO-PCI BRIDGE

ADVANCE INFORMATION

Page 13 OF 109

09/25/03 Revision 1.09

SIGNAL DEFINITIONS

3.1

SIGNAL TYPES

Signal Type

Description

PCI input (3.3V, 5V tolerant)

PIU

PCI input (3.3V, 5V tolerant) with weak pull-up

PID

PCI input (3.3V, 5V tolerant) with weak pull-down

PCI output (3.3V)

PCI tri-state bidirectional (3.3V, 5V tolerant)

PSTS

PCI sustained tri-state bi-directional (Active LOW signal which must be driven

inactive for one cycle before being tri-stated to ensure HIGH performance on a

shared signal line)

PTS

PCI tri-state output

POD

PCI output which either drives LOW (active state) or tri-state

3.2

PRIMARY BUS INTERFACE SIGNALS

Name

Pin #

Type

Description

P_AD[31:0]

Y7, W7, Y8, W8,

V8, U8, Y9, W9,

W10, V10, Y11,

V11, U11, Y12,

W12, V12, V16,

W16, Y16, W17,

Y17, U18, W18,

Y18, U19, W19,

Y19, U20, V20,

Y20, T17, R17

Primary Address/Data. Multiplexed address and data

bus. Address is indicated by P_FRAME# assertion.

Write data is stable and valid when P_IRDY# is

asserted and read data is stable and valid when

P_TRDY# is asserted. Data is transferred on rising

clock edges when both P_IRDY# and P_TRDY# are

asserted. During bus idle, PI7C7300A drives P_AD to

a valid logic level when P_GNT# is asserted.

P_CBE[3:0]

V9, U12, U16,

V19

Primary Command/Byte Enables. Multiplexed

command field and byte enable field. During address

phase, the initiator drives the transaction type on these

pins. The initiator then drives the byte enables during

data phases. During bus idle, PI7C7300A drives

P_CBE[3:0] to a valid logic level when P_GNT# is

asserted.

P_PAR

U15

Primary Parity. Parity is even across P_AD[31:0],

P_CBE[3:0], and P_PAR (i.e. an even number of 1’s).

P_PAR is an input and is valid and stable one cycle

after the address phase (indicated by assertion of

P_FRAME#) for address parity. For write data phases,

P_PAR is an input and is valid one clock after

P_IRDY# is asserted. For read data phase, P_PAR is

an output and is valid one clock after P_TRDY# is

asserted. Signal P_PAR is tri-stated one cycle after the

P_AD lines are tri-stated. During bus idle, PI7C7300A

drives P_PAR to a valid logic level when P_GNT# is

asserted.

P_FRAME#

W13

PSTS

Primary FRAME (Active LOW). Driven by the

initiator of a transaction to indicate the beginning and

duration of an access. The de-assertion of P_FRAME#

indicates the final data phase requested by the initiator.

Before being tri-stated, it is driven to a de-asserted

state for one cycle.

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