VT82C596 datasheet(13/96 Pages) ETC

13 / 96 page

VT82C596B

Revision 0.3 June 17, 1999

-7-

Pinouts

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Table 1. Pin Descriptions

PCI Bus Interface

Signal Name

Pin #

I/O

Signal Description

PCLK

D11

PCI Clock. PCLK provides timing for all transactions on the PCI Bus.

FRAME#

Frame. Assertion indicates the address phase of a PCI transfer. Negation indicates

that one more data transfer is desired by the cycle initiator.

AD[31:0]

B1, C1, E1,

D1, A2, B2,

C2, E2, B3, C3,

E3, D3, A4,

B4, C4, E4, E6,

D6, A7, B7,

C7, D7, A8,

B8, E8, D8,

A9, B9, C9,

D9, A10, B10

Address/Data Bus. The standard PCI address and data lines. The address is driven

with FRAME# assertion and data is driven or received in following cycles.

C/BE[3:0]#

D2, D4, C6, C8

Command/Byte Enable. The command is driven with FRAME# assertion. Byte

enables corresponding to supplied or requested data are driven on following clocks.

IRDY#

Initiator Ready. Asserted when the initiator is ready for data transfer.

TRDY#

Target Ready. Asserted when the target is ready for data transfer.

STOP#

Stop. Asserted by the target to request the master to stop the current transaction.

DEVSEL#

Device Select. The VT82C596B asserts this signal to claim PCI transactions through

positive or subtractive decoding.

PAR

Parity. A single parity bit is provided over AD[31:0] and C/BE[3:0]#.

SERR#

System Error. SERR# can be pulsed active by any PCI device that detects a system

error condition. Upon sampling SERR# active, the VT82C596B can be programmed

to generate an NMI to the CPU.

IDSEL

Initialization Device Select.

IDSEL is used as a chip select during PCI

configuration read and write cycles.

PIRQA-D#

R3, R4, P5, G1

PCI Interrupt Request. These pins are typically connected to the PCI bus INTA#-

INTD# pins as follows:

PIRQA#

PIRQB#

PIRQC#

PIRQD#

PCI Slot 1

INTA#

INTB#

INTC#

INTD#

PCI Slot 2

INTB#

INTC#

INTD#

INTA#

PCI Slot 3

INTC#

INTD#

INTA#

INTB#

PCI Slot 4

INTD#

INTA#

INTB#

INTC#

PREQ#

B12

PCI Request. This signal goes to the North Bridge to request the PCI bus.

PGNT#

A12

PCI Grant. This signal is driven by the North Bridge to grant PCI access to the

VT82C596B.

PCKRUN#

C10

PCI Bus Clock Run. This signal indicates whether the PCI clock is or will be

stopped (high) or running (low). The VT82C596B drives this signal low when the

PCI clock is running (default on reset) and releases it when it stops the PCI clock.

External devices may assert this signal low to request that the PCI clock be restarted

or prevent it from stopping. Refer to the PCI Mobile Design Guide for more details.

VT82C596 数据表(PDF) 13 Page - List of Unclassifed Manufacturers

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VT82C596 数据表(PDF) 13 Page - List of Unclassifed Manufacturers

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