IMX35 datasheet(106/148 Pages) FREESCALE

106 / 148 page

i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6

Freescale Semiconductor

106

Figure 82. UDMA-In Device Terminates Transfer Timing Diagram

Table 68. UDMA-In Burst Timing Parameters

ATA

Parameter

Parameters

from

Figure 80,

Figure 81,

Figure 82

Description

Controlling Variable

tack

tack (min.) = (time_ack

× T) – (tskew1 + tskew2)

time_ack

tenv

tenv (min.) = (time_env

× T) – (tskew1 + tskew2)

tenv (max.) = (time_env

× T) + (tskew1 + tskew2)

time_env

tds

tds1

tds – (tskew3) – ti_ds > 0

tskew3, ti_ds, ti_dh

should be low enough

tdh

tdh1

tdh – (tskew3) – ti_dh > 0

tcyc

tc1

(tcyc – tskew > T

T big enough

trp

trp (min.) = time_rp

× T – (tskew1 + tskew2 + tskew6)

time_rp

—tx11

1 There is a special timing requirement in the ATA host that requires the internal DIOW to go high three clocks after the last active

edge on the DSTROBE signal. The equation given on this line tries to capture this constraint.

2. Make ton and toff large enough to avoid bus contention.

(time_rp

× T) – (tco + tsu + 3T + 2 × tbuf + 2 × tcable2) > trfs (drive)

time_rp

tmli

tmli1

tmli1 (min.) = (time_mlix + 0.4)

× T

time_mlix

tzah

tzah (min.) = (time_zah + 0.4)

× T

time_zah

tdzfs

tdzfs = (time_dzfs

× T) – (tskew1 + tskew2)

time_dzfs

tcvh

tcvh = (time_cvh

× T) – (tskew1 + tskew2)

time_cvh

—ton

toff

ton = time_on

× T – tskew1

toff = time_off

× T – tskew1

—

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