TS4GDOM40V datasheet(46/52 Pages) TRANSCEND

46 / 52 page

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Transcend Information Inc.

Ver 1.7

Device Pausing an Ultra DMA Data-Out Burst

The device pauses an Ultra DMA Data-Out burst by following the steps lettered below. The timing

diagram is shown in below: Ultra DMA Data-Out Burst Device Pause Timing. The timing parameters are

specified in Page 12: Ultra DMA Data Burst Timing Requirements and are described in Page 13: Ultra

DMA Data Burst Timing Descriptions.

The following steps shall occur in the order they are listed unless otherwise specifically allowed:

(a) The device shall not pause an Ultra DMA data burst until at least one data word of an Ultra DMA data

burst has been transferred.

(b) The device shall pause an Ultra DMA data burst by negating -DDMARDY.

(d) While operating in Ultra DMA modes 2, 1, or 0 the device shall be prepared to receive zero, one or two

additional data words after negating -HDMARDY. While operating in Ultra DMA modes 4 or 3 the

device shall be prepared to receive zero, one, two or three additional data words. The additional data

words are a result of cable round trip delay and tRFS timing for the device.

(e) The device shall resume an Ultra DMA data burst by asserting -DDMARDY.

ALL WAVEFORMS IN THIS DIAGRAM ARE SHOWN WITH THE ASSERTED STATE HIGH.

NEGATIVE TRUE SIGNALS APPEAR INVERTED ON THE BUS RELATIVE TO THE DIAGRAM.

Notes:

(1) The device may negate DMARQ to request termination of the Ultra DMA data burst no sooner than tRP after -DDMARDY is

negated.

(2) After negating -DDMARDY, the device may receive zero, one, two, or three more data words from the host.

TS4GDOM40V Datasheet(PDF) 46 Page - Transcend Information. Inc.