MCIMX25 Motorola Semiconductor Products, MCIMX25 Datasheet - Page 44

• Manufacturer Part Number: MCIMX25
• Manufacturer: Motorola Semiconductor Products

Figure 12
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
44
Parameter
See
ATA
tA
—
—
t1
t2
t9
t3
t4
t0
Figure
gives timing waveforms for PIO write mode.
Mode Timing
12.
Parameter
PIO Write
t2w
—
—
—
—
t1
t9
t4
tA
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 2
1
Write 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
ADDR
(See note 1)
buffer_en
Table 33. Timing Parameters for PIO Write Mode
DIOR
DIOW
IORDY
IORDY
Figure 12. PIO Write Mode Timing
T – (tskew1 + tskew2 + tskew5)
T – (tskew1 + tskew2 + tskew6)
T – tskew1
T – (tskew1 + tskew2 + tskew5)
t1
Relation
ton
tA
T – (tskew1 + tskew2 +tskew5)
T
t2w
tB
t4 toff
t9
t1
tbuf)
if not met, increase time_2w
Adjustable Parameter(s)
time_1, time_2r, time_9
Freescale Semiconductor
time_2w
time_ax
time_9
time_4
time_1
—
—
Table 33