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C141-E090-01EN5 - 80
9) The device shall assert DDMARDY- within t
LI
after the host has negated STOP. After
asserting DMARQ and DDMARDY- the device shall not negate either signal until after
the first negation of HSTROBE by the host.
10) The host shall drive the first word of the data transfer onto DD (15:0). This step may
occur any time during Ultra DMA burst initiation.
11) To transfer the first word of data: the host shall negate HSTROBE no sooner than t
LI
after
the device has asserted DDMARDY-. The host shall negate HSTROBE no sooner than
t
DVS
after the driving the first word of data onto DD (15:0).
5.5.4.2 The data out transfer
The following steps shall occur in the order they are listed unless otherwise specifically
allowed (see 5.6.3.8 and 5.6.3.2 for specific timing requirements):
1) The host shall drive a data word onto DD (15:0).
2) The host shall generate an HSTROBE edge to latch the new word no sooner than t
DVS
after
changing the state of DD (15:0). The host shall generate an HSTROBE edge no more
frequently than t
CYC
for the selected Ultra DMA Mode. The host shall not generate two
rising or falling HSTROBE edges more frequently than 2 t
CYC
for the selected Ultra DMA
mode.
3) The host shall not change the state of DD (15:0) until at least t
DVH
after generating an
HSTROBE edge to latch the data.
4) The host shall repeat steps (1), (2) and (3) until the data transfer is complete or an Ultra
DMA burst is paused, whichever occurs first.
5.5.4.3 Pausing an Ultra DMA data out burst
The following steps shall occur in the order they are listed unless otherwise specifically
allowed (see 5.6.3.9 and 5.6.3.2 for specific timing requirements).
a) Host pausing an Ultra DMA data out burst
1) The host shall not pause an Ultra DMA burst until at least one data word of an Ultra
DMA burst has been transferred.
2) The host shall pause an Ultra DMA burst by not generating an HSTROBE edge.
Note: The device shall not immediately negate DMARQ to initiate Ultra DMA burst
termination when the host stops generating HSTROBE edges. If the host does not
assert STOP, in order to initiate Ultra DMA burst termination, the device shall negate
DDMARDY- and wait t
RP
before negating DMARQ.
3) The host shall resume an Ultra DMA burst by generating an HSTROBE edge.