Transcend
44-Pin ID
E Flash M
odule (Horizo
ntal)
TS128M ~
4GDOM44H-
S
Host Pausing an Ultra DMA Data-In Burst
The host pauses a Data-In burst by following the steps lettered below. A timing diagram is shown in
below: Ultra DMA Data-In Burst Host 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 host 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 host shall pause an Ultra DMA data burst by negating -HDMARDY.
(c) The device shall stop generating DSTROBE edges within tRFS of the host negating -HDMARDY.
(d) While operating in Ultra DMA modes 2, 1, or 0 the host 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 host
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 host shall resume an Ultra DMA data burst by asserting -HDMARDY.
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 host may assert STOP to request termination of the Ultra DMA data burst no sooner than tRP after
-HDMARDY is negated.
(2) After negating -HDMARDY, the host may receive zero, one, two, or three more data words from the device.
(3) The bus polarity of the (-) DMARQ and (-)DMACK signals is dependent on the active interface mode.
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