MCIMX257CJM4A Freescale, MCIMX257CJM4A Datasheet - Page 46

• Manufacturer Part Number: MCIMX257CJM4A
• Manufacturer: Freescale

Specifications of MCIMX257CJM4A

• Lead Free Status / RoHS Status: Compliant

To meet PIO read 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
Figure 12
46
Parameter
See
ATA
trd
tA
t1
t2
t9
t5
t6
t0
Figure
gives timing waveforms for PIO write mode.
Mode Timing
11.
Parameter
PIO Read
trd1
t2r
—
t1
t9
t5
t6
tA
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 6
1
t1(min.) = time_1
t2(min.) = time_2r
t9(min.) = time_9
t5(min.) = tco + tsu + tbuf + tbuf + tcable1 + tcable2
0
tA(min.) = (1.5 + time_ax) T – (tco + tsui + tcable2 + tcable2 + 2 tbuf)
trd1(max.) = (–trd) + (tskew3 + tskew4)
trd1(min.) = (time_pio_rdx – 0.5)
(time_pio_rdx – 0.5)
t0(min.) = (time_1 + time_2 + time_9)
Write Data(15:0)
ADDR
(See note 1)
buffer_en
Table 34. Timing Parameters for PIO Read Mode
DIOR
DIOW
IORDY
IORDY
Figure 12. PIO Write Mode Timing
T – (tskew1 + tskew2 + tskew5)
T – (tskew1 + tskew2 + tskew6)
T – (tskew1 + tskew2 + tskew5)
T > tsu + thi + tskew3 + tskew4
t1
Relation
ton
tA
T – (tsu + thi)
T
t2w
tB
t4 toff
t9
t1
If not met, increase time_2
time_1, time_2r, time_9
Freescale Semiconductor
Adjustable Parameter
time_pio_rdx
time_ax
time_2r
time_9
time_1
—
Table 34