Fujitsu MPC3065AH Manual Do Utilizador

C141-E056-01EN

5 - 76

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.

The following steps shall occur in the order they are listed unless otherwise specifically
allowed (see 5.6.4.7 and 5.6.4.2 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.