VT8231 datasheet(22/132 Pages) ETC

номер детали	VT8231

подробное описание детали	SOUTH BRIDGE PC99 COMPLIANT

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VT8231

Preliminary Revision 0.8 October 29, 1999

-16-

Pinouts

7HFKQRORJLHV ,QF

:H &RQQHFW

UltraDMA-33 / 66 Enhanced IDE Interface (continued)

Signal Name

Pin #

I/O

Signal Description

PDCS1#

L18

Primary Master Chip Select. This signal corresponds to CS1FX#

on the primary IDE connector.

PDCS3#

L19

Primary Slave Chip Select. This signal corresponds to CS3FX# on

the primary IDE connector.

SDCS1#

U18

Secondary Master Chip Select.

This signal corresponds to

CS17X# on the secondary IDE connector.

SDCS3#

U19

Secondary Slave Chip Select. This signal corresponds to CS37X#

on the secondary IDE connector.

PDA[2-0]

M20, M18, M19

Primary Disk Address. PDA[2:0] are used to indicate which byte

in either the ATA command block or control block is being accessed.

SDA[2-0]

V20, V18, V19

Secondary Disk Address. SDA[2:0] are used to indicate which byte

in either the ATA command block or control block is being accessed.

PDD[15-0]

T17, R17, T18, T20,

P17, N16, R19, P18,

R18, R20, N17, P16,

T19, U20, R16, T16

Primary Disk Data

SDD[15-0] / SA[15-0]

W18, V17, Y17, W16,

V15, Y15, W14, T15,

U15, U16, V14, W15,

Y16, V16, W17, Y18

Secondary Disk Data (SPKR strap 4.7K ohms low) or

ISA Address (SPKR strap 4.7K ohms high)

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