Terminating An Ultra Dma Data In Burst - Fujitsu MHJ2181AT Product Manual

3) The device shall resume an Ultra DMA burst by generating a DSTROBE
b) Host pausing an Ultra DMA data in burst
1) The host shall not pause an Ultra DMA burst until at least one data word
2) The host shall pause an Ultra DMA burst by negating HDMARDY-.
3) The device shall stop generating DSTROBE edges within t
4) If the host negates HDMARDY- within t
5) The host shall resume an Ultra DMA burst by asserting HDMARDY-.

5.5.3.4 Terminating an Ultra DMA data in burst

a) Device terminating an Ultra DMA data in burst
The following steps shall occur in the order they are listed unless otherwise
specifically allowed (see 5.6.4.5 and 5.6.4.2 for specific timing
requirements):
1) The device shall initiate termination of an Ultra DMA burst by not
2) The device shall negate DMARQ no sooner than t
3) The device shall release DD (15:0) no later than t
4) The host shall assert STOP within t
5) The host shall negate HDMARDY- within t
6) The host shall drive DD (15:0) no sooner than t
C141-E088-03EN
edge.
of an Ultra DMA burst has been transferred.
negating HDMARDY-.
a DSTROBE edge, then the host shall be prepared to receive zero or one
additional data words. If the host negates HDMARDY- greater than t
after the device has generated a DSTROBE edge, then the host shall be
prepared to receive zero, one or two additional data words. The
additional data words are a result of cable round trip delay and t
for the device.
generating DSTROBE edges.
last DSTROBE edge. The device shall not assert DMARQ again until
after the Ultra DMA burst is terminated.
DMARQ.
DMARQ. The host shall not negate STOP again until after the Ultra
DMA burst is terminated.
DMARQ. The host shall continue to negate HDMARDY- until the Ultra
DMA burst is terminated. Steps (4) and (5) may occur at the same time.
negated DMARQ. For this step, the host may first drive DD (15:0) with
the result of its CRC calculation (see 5.5.5):
5.5 Ultra DMA Feature Set
RFS
after the device has generated
SR
after generating the
SS
after negating
AZ
after the device has negated
LI
after the device has negated
LI
after the device has
ZAH
of the host
SR
timing
RFS
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