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C141-E034-02EN 5 - 65
3) The device shall stop generating DSTROBE edges within t
RFS
of the host negating
HDMARDY-.
4) If the host negates HDMARDY- within t
SR
after the device has generated 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
SR
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
RFS
timing for the
device.
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 generating DSTROBE
edges.
2) The device shall negate DMARQ no sooner than t
SS
after generating the last DSTROBE
edge. The device shall not assert DMARQ again until after the Ultra DMA burst is
terminated.
3) The device shall release DD (15:0) no later than t
AZ
after negating DMARQ.
4) The host shall assert STOP within t
LI
after the device has negated DMARQ. The host
shall not negate STOP again until after the Ultra DMA burst is terminated.
5) The host shall negate HDMARDY- within t
LI
after the device has negated 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.
6) The host shall drive DD (15:0) no sooner than t
ZAH
after the device has negated DMARQ.
For this step, the host may first drive DD (15:0) with the result of its CRC calculation (see
5.5.5):
7) If DSTROBE is negated, the device shall assert DSTROBE within t
LI
after the host has
asserted STOP. No data shall be transferred during this assertion. The host shall ignore
this transition on DSTROBE. DSTROBE shall remain asserted until the Ultra DMA
burst is terminated.
8) If the host has not placed the result of its CRC calculation on DD (15:0) since first driving
DD (15:0) during (6), the host shall place the result of its CRC calculation on DD (15:0)
(see 5.5.5).
9) The host shall negate DMACK- no sooner than t
MLI
after the device has asserted
DSTROBE and negated DMARQ and the host has asserted STOP and negated
HDMARDY-, and no sooner than t
DVS
after the host places the result of its CRC
calculation on DD (15:0).