PI7C8150BMA-33 datasheet(12/107 Pages) PERICOM

12 / 107 page

PI7C8150B

ASYNCHRONOUS 2-PORT PCI-TO-PCI BRIDGE

Page 12 of 107

April 2015 – Revision 2.1

SIGNAL DEFINITIONS

2.1

Signal Types

Signal Type

Description

Input Only

Output Only

Power

Tri-State bi-directional

STS

Sustained Tri-State. Active LOW signal must be pulled HIGH for 1 cycle when

deasserting.

Open Drain

2.2

Signals

Note: Signal names that end with “_L” are active LOW.

2.2.1

PRIMARY BUS INTERFACE SIGNALS

Name

Pin #

Type

Description

P_AD[31:0]

49, 50, 55, 57, 58,

60, 61, 63, 67, 68,

70, 71, 73, 74, 76,

77, 93, 95, 96, 98,

99, 101, 107, 109,

112, 113, 115,

116, 118, 119,

121, 122

N3, T2, T4, N5,

P5, T5, N6, R5,

T6, P7, T7, R7,

T8, P8, R8, T9,

R12, P12, T14,

R13, N12, T15,

P16, N15, M14,

M13, M15,

L13, M16, L14,

L15, L16

Primary Address / Data: Multiplexed address and data

bus. Address is indicated by P_FRAME_L assertion.

Write data is stable and valid when P_IRDY_L is

asserted and read data is stable and valid when

P_TRDY_L is asserted. Data is transferred on rising

clock edges when both P_IRDY_L and P_TRDY_L are

asserted. During bus idle, PI7C8150B drives P_AD to a

valid logic level when P_GNT_L is asserted.

P_CBE[3:0]

64, 79, 92, 110

R6, R9, T13,

N16

Primary Command/Byte Enables: Multiplexed

command field and byte enable field. During address

phase, the initiator drives the transaction type on these

pins. After that, the initiator drives the byte enables

during data phases. During bus idle, PI7C8150B drives

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

asserted.

P_PAR

N11

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_L) for address parity. For write data phases,

P_PAR is an input and is valid one clock after

P_IRDY_L is asserted. For read data phase, P_PAR is

an output and is valid one clock after P_TRDY_L is

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

P_AD lines are tri-stated. During bus idle, PI7C8150B

drives P_PAR to a valid logic level when P_GNT_L is

asserted.

P_FRAME_L

STS

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_L

indicates the final data phase requested by the initiator.

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

for one cycle.

15-0048

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