MCIMX255AJM4A Freescale, MCIMX255AJM4A Datasheet - Page 47

• Manufacturer Part Number: MCIMX255AJM4A
• Manufacturer: Freescale

Specifications of MCIMX255AJM4A

• Lead Free Status / RoHS Status: Compliant

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.
3.7.2.3.1
Figure 15
Freescale Semiconductor
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 36. Timing Parameters for MDMA Read and Write Modes (continued)
tkjn
ton
toff
—
—
2
1
i.MX25 Applications Processor for Automotive Products, Rev. 4
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)
time_d, time_k
Parameter(s)
Adjustable
time_jn
time_k
—
3
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