MCIMX25 Motorola Semiconductor Products, MCIMX25 Datasheet - Page 45

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

3.6.2.2
Figure 13
To meet timing requirements, a number of timing parameters must be controlled. See
on timing parameters for MDMA read and write modes.
Freescale Semiconductor
Parameter
tg(write)
tg(read)
tf(read)
tm, ti
ATA
td
tk
t0
and
MDMA Read
Parameters
and Write
Multiword DMA (MDMA) Mode Timing
Figure 14
Timing
td, td1
tgr
tm
—
—
tk
tfr
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 2
2
Table 34. Timing Parameters for MDMA Read and Write Modes
1
READ Data(15:0)
Write Data(15:0)
show the timing for MDMA read and write modes, respectively.
tm(min.) = ti(min.) = time_m
td1(min.) = td(min.) = time_d
tk(min.) = time_k
t0(min.) = (time_d + time_k)
tgr(min.–read) = tco + tsu + tbuf + tbuf + tcable1 + tcable2
tgr(min.–drive) = td – te(drive)
tfr(min.–drive) =0 k
tg(min.–write) = time_d
ADDR
(See note 1)
ADDR
(See note 1)
buffer_en
DMACK
DMACK
DMARQ
DMARQ
DIOR
DIOW
Figure 14. MDMA Write Mode Timing
Figure 13. MDMA Read Mode Timing
T – (tskew1 + tskew2 + tskew6)
tm
te
tgr
tm ton td1
T –(tskew1 + tskew2 + tskew5)
td
T – (tskew1 + tskew2 + tskew5)
T
tk
T – (tskew1 + tskew2 + tskew6)
Relation
tfr
tk
td
tk1
tk1
tkjn
tkjn
toff
Table 34
time_d, time_k
Parameter(s)
Adjustable
time_m
time_d
time_k
time_d
time_d
—
for details
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