Fujitsu MHU2100AT Product Manual page 219

b) Device terminating an Ultra DMA data out burst
The following steps shall occur in the order they are listed unless otherwise
specifically allowed (see 5.6.3.11 and 5.6.3.2 for specific timing
requirements):
1) The device shall not initiate Ultra DMA burst termination until at least
2) The device shall initiate Ultra DMA burst termination by negating
3) The host shall stop generating an HSTROBE edges within t
4) If the device negates DDMARDY- within t
5) The device shall negate DMARQ no sooner than t
6) The host shall assert STOP with t
7) If HSTROBE is negated, the host shall assert HSTROBE with t
8) The host shall place the result of its CRC calculation on DD (15:0) (see
9) The host shall negate DMACK- no sooner than t
10) The device shall latch the host's CRC data from DD (15:0) on the
11) The device shall compare the CRC data received from the host with the
12) The device shall release DDMARDY- within t
C141-E202-01EN
one data word of an Ultra DMA burst has been transferred.
DDMARDY-.
device negating DDMARDY-.
an HSTROBE edge, then the device shall be prepared to receive zero or
one additional data words. If the device negates DDMARDY- greater
than t after the host has generated an HSTROBE edge, then the device
SR
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 host.
DDMARDY-. The device shall not assert DMARQ again until after the
Ultra DMA burst is terminated.
The host shall not negate STOP again until after the Ultra DMA burst is
terminated.
device has negated DMARQ. No data shall be transferred during this
assertion. The device shall ignore this transition of HSTROBE.
HSTROBE shall remain asserted until the Ultra DMA burst is
terminated.
5.5.5).
asserted HSTROBE and STOP and the device has negated DMARQ and
DDMARDY-, and no sooner than t
calculation on DD (15:0).
negating edge of DMACK-.
results of its own CRC calculation. If a miscompare error occurs during
one or more Ultra DMA bursts for any one command, at the end of the
command, the device shall report the first error that occurred (see 5.5.5).
DMACK-.
5.5 Ultra DMA Feature Set
after the host has generated
SR
after negating
RP
after the device has negated DMARQ.
LI
after the host has
MLI
after placing the result of its CRC
DVS
after the host has negated
IORDYZ
of the
RFS
timing
RFS
after the
LI
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