Table of Contents
Advertisement
7) If DSTROBE is negated, the device shall assert DSTROBE within t
8) If the host has not placed the result of its CRC calculation on DD (15:0)
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 DSTROBE within t
13) The host shall not negate STOP no assert HDMARDY- until at least t
14) The host shall not assert DIOR-, CS0-, CS1-, DA2, DA1, or DA0 until at
b) Host terminating an Ultra DMA data in burst
The following steps shall occur in the order they are listed unless otherwise
specifically allowed (see 5.6.3.6 and 5.6.3.2 for specific timing requirements):
1) The host shall not initiate Ultra DMA burst termination until at least one
2) The host shall initiate Ultra DMA burst termination by negating
3) The device shall stop generating DSTROBE edges within t
C141-E250
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.
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).
asserted DSTROBE and negated DMARQ and the host has asserted
STOP and negated HDMARDY-, and no sooner than t
places the result of its CRC 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-.
after negating DMACK-.
least t
after negating DMACK.
ACK
data word of an Ultra DMA burst has been transferred.
HDMARDY-. The host shall continue to negate HDMARDY- until the
Ultra DMA burst is terminated.
negating HDMARDY-.
5.5 Ultra DMA Feature Set
LI
after the device has
MLI
after the host
DVS
after the host negates
IORDYZ
of the host
RFS
5-141
after
ACK
Advertisement
Table of Contents
