MCIMX25 Motorola Semiconductor Products, MCIMX25 Datasheet - Page 46

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MCIMX25

Manufacturer Part Number
MCIMX25
Description
Manufacturer
Motorola Semiconductor Products
Datasheet

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1
2
3
3.6.2.3
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.
3.6.2.3.1
Figure 15
46
Parameter
See
See
tk1 in the UDMA figures equals (tk –2
tf(write)
ATA
tn, tj
tL
Figure
Figure
shows the timing for UDMA in-transfer start.
13.
14.
MDMA Read
Parameters
and Write
Ultra DMA (UDMA) Mode Timing
Timing
UDMA In-Transfer Timing
Table 34. Timing Parameters for MDMA Read and Write Modes (continued)
tkjn
ton
toff
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 2
2
1
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
Figure 15. Timing for UDMA In-Transfer Start
DMACK
DMARQ
DIOR
DIOW
DATA READ
ADDR
IORDY
T).
T – tskew1
T – tskew1
T – (tskew1 + tskew2 + tskew6)
tack
Relation
tenv
T – (tsu + tco + 2
T – (tskew1 + tskew2 + tskew6)
tds
tc1
tdh
tc1
tbuf + 2
tcable2)
Freescale Semiconductor
time_d, time_k
Parameter(s)
Adjustable
time_jn
time_k
3

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