W83C554F datasheet(21/156 Pages) WINBOND

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W83C554F

Pin Descriptions

WINBOND ELECTRONICS CORP. AMERICA

Table 2-4 (continued). IDE Interface Bus Signals

Pin Name

Pin #

Input/

Output

Description

DA[2:0]

88,90,89

Output

IDE Drive Address for command block and control block of device

(drive).

DD[15:0]

98,101,103,

105,108,

110,112,

114,115,

113,111,

109,106,

104,102,

100

Input/

Output

IDE Drive Data. 16-bit bi-directional bus.

IDECHRDY/

DDMARDY#/

DSTROBE

Input

Multi-function pin.

In PIO and Multiword DMA modes: IDE I/O Channel Ready.

When IDECHRDY is negated, the current cycle will be extended.

This input is connected to the primary port, and can also be

connected to the secondary port.

In UltraDMA Read mode: DSTROBE. 554F latches the data from

the device (drive) on the rising and falling edge of DSTROBE.

In UltraDMA Write mode: DDMARDY#. 554F uses this signal,

when negated by the device (drive), to pause the UltraDMA

transaction.

IDEIRQB

Input

IDE IRQ B. Secondary port interrupt request.

IDEIRQA

Input

IDE IRQ A. Primary port interrupt request.

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