MCIMX35 Motorola Semiconductor Products, MCIMX35 Datasheet - Page 99

• Manufacturer Part Number: MCIMX35
• Manufacturer: Motorola Semiconductor Products

1
2. Make ton and toff big enough to avoid bus contention.
Freescale Semiconductor
There is a special timing requirement in the ATA host that requires the internal DIOW to go only high 3 clocks after the last
active edge on the DSTROBE signal. The equation given on this line tries to capture this constraint.
Parameter
MCIMX35 (i.MX35) Multimedia Applications Processor for Automotive Products Advance Information, Rev. 0
tdzfs
ATA
tenv
tzah
tack
tcyc
tcvh
tmli
tds
tdh
trp
—
—
Parameter
Figure
Figure
Figure 72
from
tmli1
tdzfs
tds1
tdh1
tzah
tack
tenv
tx1
tcvh
ton
toff
tc1
trp
Figure 72. UDMA-In Device Terminates Transfer Timing Diagram
1
70,
71,
tack (min.) = (time_ack * T) – (tskew1 + tskew2)
tenv (min.) = (time_env * T) – (tskew1 + tskew2)
tenv (max.) = (time_env * T) + (tskew1 + tskew2)
tds – (tskew3) – ti_ds > 0
tdh – (tskew3) –ti_dh > 0
(tcyc – tskew) > T
trp (min.) = time_rp * T – (tskew1 + tskew2 + tskew6)
(time_rp * T) – (tco + tsu + 3T + 2 *tbuf + 2*tcable2) > trfs (drive)
tmli1 (min.) = (time_mlix + 0.4) * T
tzah (min.) = (time_zah + 0.4) * T
tdzfs = (time_dzfs * T) – (tskew1 + tskew2)
tcvh = (time_cvh *T) – (tskew1 + tskew2)
ton = time_on * T – tskew1
toff = time_off * T – tskew1
Table 65. UDMA-In Burst Timing Parameters
Preliminary—Subject to Change Without Notice
Description
should be low enough
Controlling Variable
tskew3, ti_ds, ti_dh
T big enough
time_dzfs
time_mlix
time_ack
time_env
time_zah
time_cvh
time_rp
time_rp
—
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