MCIMX257DJM4A Freescale, MCIMX257DJM4A Datasheet - Page 47

• Manufacturer Part Number: MCIMX257DJM4A
• Manufacturer: Freescale

Specifications of MCIMX257DJM4A

• Operating Temperature (min): -20C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

To meet PIO write mode timing requirements, a number of timing parameters must be controlled.
shows timing parameters and their determining relations, and indicates parameters that can be adjusted to
meet required conditions.
1
3.7.2.2
Figure 13
Freescale Semiconductor
Parameter
See
ATA
tA
—
—
t1
t2
t9
t3
t4
t0
Figure
and
Mode Timing
12.
Parameter
PIO Write
Multiword DMA (MDMA) Mode Timing
Figure 14
t2w
—
tA
—
—
—
t1
t9
t4
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 6
1
READ Data(15:0)
t1(min.) = time_1
t2(min.) = time_2w
t9(min.) = time_9
t3(min.) = (time_2w – time_on)
t4(min.) = time_4
tA = (1.5 + time_ax) T – (tco + tsui + tcable2 + tcable2 + 2
t0(min.) = (time_1 + time_2 + time_9)
Avoid bus contention when switching buffer on by making ton long
enough
Avoid bus contention when switching buffer off by making toff long
enough
show the timing for MDMA read and write modes, respectively.
ADDR
(See note 1)
Table 35. Timing Parameters for PIO Write Mode
DMACK
DMARQ
DIOR
Figure 13. MDMA Read Mode Timing
T – (tskew1 + tskew2 + tskew5)
T – (tskew1 + tskew2 + tskew6)
T – tskew1
T – (tskew1 + tskew2 + tskew5)
tm
te
tgr
td
Relation
tk
tfr
T – (tskew1 + tskew2 +tskew5)
T
tk1
tkjn
tbuf)
if not met, increase time_2w
Adjustable Parameter(s)
time_1, time_2r, time_9
time_2w
time_ax
time_9
time_4
time_1
—
—
Table 35
47