MCIMX253CJM4A Freescale, MCIMX253CJM4A Datasheet - Page 48
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MCIMX253CJM4A
Manufacturer Part Number
MCIMX253CJM4A
Description
Manufacturer
Freescale
Datasheet
1.MCIMX253CJM4A.pdf
(142 pages)
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To meet timing requirements, a number of timing parameters must be controlled. See
on timing parameters for MDMA read and write modes.
1
2
3
3.7.2.3
UDMA mode timing is more complicated than PIO mode or MDMA mode. In this section, timing
diagrams for UDMA in- and out-transfers are provided.
48
Parameter
tg(read)
tg(write)
See
See
tk1 in the UDMA figures equals (tk –2
tf(read)
tf(write)
tm, ti
ATA
tn, tj
—
td
tk
t0
tL
Figure
Figure
13.
14.
MDMA Read
Parameters
and Write
Ultra DMA (UDMA) Mode Timing
Timing
td, td1
tkjn
ton
toff
tm
tgr
—
—
—
—
tfr
tk
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 6
2
Table 36. Timing Parameters for MDMA Read and Write Modes
1
Write Data(15:0)
tm(min.) = ti(min.) = time_m
td1(min.) = td(min.) = time_d
tk(min.) = time_k
t0(min.) = (time_d + time_k)
tgr(min.–read) = tco + tsu + tbuf + tbuf + tcable1 + tcable2
tgr(min.–drive) = td – te(drive)
tfr(min.–drive) =0 k
tg(min.–write) = time_d
tf(min.–write) = time_k
tL(max.) = (time_d + time_k–2)
tn= tj= tkjn = (max.(time_k,. time_jn)
ton = time_on
toff = time_off
ADDR
(See note 1)
buffer_en
DMACK
DMARQ
DIOW
Figure 14. MDMA Write Mode Timing
T).
T – tskew1
T – tskew1
T – (tskew1 + tskew2 + tskew6)
tm ton td1
T – (tskew1 + tskew2 + tskew6)
T –(tskew1 + tskew2 + tskew5)
T – (tskew1 + tskew2 + tskew5)
T
T – (tskew1 + tskew2 + tskew6)
Relation
tk
T – (tsu + tco + 2
td
T – (tskew1 + tskew2 + tskew6)
tbuf + 2
tk1
tkjn
toff
tcable2)
Freescale Semiconductor
Table 36
time_d, time_k
time_d, time_k
Parameter(s)
Adjustable
time_m
time_jn
time_d
time_d
time_d
time_k
time_k
—
—
for details
3
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