TS4GDOM40V datasheet(36/52 Pages) TRANSCEND

36 / 52 page

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Transcend Information Inc.

Ver 1.7

Initiating an Ultra DMA Data-In Burst

(a) An Ultra DMA Data-In burst is initiated by following the steps lettered below. The timing diagram is

shown in below: Ultra DMA Data-In Burst Initiation Timing. The associated 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.

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

(d) The device shall assert DMARQ to initiate an Ultra DMA data burst. After assertion of DMARQ the

device shall not negate DMARQ until after the first negation of DSTROBE.

(e) Steps (c), (d), and (e) may occur in any order or at the same time. The host shall assert STOP.

(f) The host shall negate -HDMARDY.

(g) In True IDE mode, the host shall not assert -CS0, -CS1 and A[02:00].

(h) Steps (c), (d), and (e) shall have occurred at least tACK before the host asserts -DMACK. The host

shall keep -DMACK asserted until the end of an Ultra DMA data burst.

(i) The host shall release D[15:00] within tAZ after asserting -DMACK.

(j) The device may assert DSTROBE tZIORDY after the host has asserted -DMACK. While operating in

True IDE mode, once the device has driven DSTROBE, the device shall not release DSTROBE until

after the host has negated -DMACK at the end of an Ultra DMA data burst.

(k) The host shall negate STOP and assert -HDMARDY within tENV after asserting -DMACK. After

negating STOP and asserting -HDMARDY, the host shall not change the state of either signal until

after receiving the first transition of DSTROBE from the device (i.e., after the first data word has been

received).

(l) The device shall drive D[15:00] no sooner than tZAD after the host has asserted -DMACK, negated

STOP, and asserted -HDMARDY.

(m) The device shall drive the first word of the data transfer onto D[15:00]. This step may occur when the

device first drives D[15:00] in step (j).

(n) To transfer the first word of data the device shall negate DSTROBE within tFS after the host has

negated STOP and asserted -HDMARDY. The device shall negate DSTROBE no sooner than tDVS

after driving the first word of data onto D[15:00].

TS4GDOM40V Datasheet(PDF) 36 Page - Transcend Information. Inc.