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C141-E090-01EN 5 - 79
10) If the host has not placed the result of its CRC calculation on DD (15:0) since first
driving DD (15:0) during (9), the host shall place the result of its CRC calculation on
DD (15:0) (see 5.5.5).
11) 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).
12) The device shall latch the host's CRC data from DD (15:0) on the negating edge of
DMACK-.
13) The device shall compare the CRC data received from the host with the results of its
own CRC calculation. If a miscompare error occurs during one or more Ultra DMA
burst for any one command, at the end of the command, the device shall report the
first error that occurred (see 5.5.5).
14) The device shall release DSTROBE within t
IORDYZ
after the host negates DMACK-.
15) The host shall neither negate STOP nor assert HDMARDY- until at least t
ACK
after the
host has negated DMACK-.
16) The host shall not assert DIOR-, CS0-, CS1-, DA2, DA1, or DA0 until at least t
ACK
after negating DMACK.
5.5.4 Ultra DMA data out commands
5.5.4.1 Initiating an Ultra DMA data out burst
The following steps shall occur in the order they are listed unless otherwise specifically
allowed (see 5.6.3.7 and 5.6.3.2 for specific timing requirements):
1) The host shall keep DMACK- in the negated state before an Ultra DMA burst is initiated.
2) The device shall assert DMARQ to initiate an Ultra DMA burst.
3) Steps (3), (4), and (5) may occur in any order or at the same time. The host shall assert
STOP.
4) The host shall assert HSTROBE.
5) The host shall negate CS0-, CS1-, DA2, DA1, and DA0. The host shall keep CS0-, CS1-,
DA2, DA1, and DA0 negated until after negating DMACK- at the end of the burst.
6) Steps (3), (4), and (5) shall have occurred at least t
ACK
before the host asserts DMACK-.
The host shall keep DMACK- asserted until the end of an Ultra DMA burst.
7) The device may negate DDMARDY- t
ZIORDY
after the host has asserted DMACK-. Once
the device has negated DDMARDY-, the device shall not release DDMARDY- until after
the host has negated DMACK- at the end of an Ultra DMA burst.
8) The host shall negate STOP within t
ENV
after asserting DMACK-. The host shall not assert
STOP until after the first negation of HSTROBE.