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Transcend Information Inc.

Ver 1.3

31

Host Terminating an Ultra DMA Data-Out Burst

Termination of an Ultra DMA Data-Out burst by the host is shown in below: Ultra DMA Data-Out

Burst Host Termination Timing while timing parameters are specified in Page 12: Ultra DMA Data Burst

Timing Requirements and timing parameters 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 host shall initiate termination of an Ultra DMA data burst by not generating HSTROBE edges.

shall not negate STOP again until after the Ultra DMA data burst is terminated.

DMARQ again until after the Ultra DMA data burst is terminated.

assert -DDMARDY again until after the Ultra DMA data burst termination is complete.

DMARQ. No data shall be transferred during this assertion. The device shall ignore this transition on

HSTROBE. HSTROBE shall remain asserted until the Ultra DMA data burst is terminated.

(f) The host shall place the result of its CRC calculation on D[15:00] (see ATA specification Ultra DMA

CRC Calculation).

of its CRC calculation on D[15:00].

(h) The device shall latch the host’s CRC data from D[15:00] on the negating edge of -DMACK.

(i) The device shall compare the CRC data received from the host with the results of its own CRC

calculation. If a miscompare error occurs during one or more Ultra DMA data bursts for any one

command, at the end of the command, the device shall report the first error that occurred (see ATA

specification Ultra DMA CRC Calculation).

has negated -DMACK.

negating DMACK..