Technical data

MCIMX31C/MCIMX31LC Technical Data, Rev. 4.3
24 Freescale Semiconductor
Electrical Characteristics
Figure 11. Multiword DMA (MDMA) Timing
Figure 12 shows timing for MDMA read, Figure 13 shows timing for MDMA write, and Table 24 lists the
timing parameters for MDMA read and write.
Table 23. PIO Write Timing Parameters
ATA
Parameter
Parameter
from Figure 11
Value
Controlling
Variable
t1 t1 t1 (min) = time_1 * T – (tskew1 + tskew2 + tskew5) time_1
t2 t2w t2 (min) = time_2w * T – (tskew1 + tskew2 + tskew5) time_2w
t9 t9 t9 (min) = time_9 * T – (tskew1 + tskew2 + tskew6) time_9
t3 — t3 (min) = (time_2w – time_on)* T – (tskew1 + tskew2 +tskew5) If not met, increase
time_2w
t4 t4 t4 (min) = time_4 * T – tskew1 time_4
tA tA tA = (1.5 + time_ax) * T – (tco + tsui + tcable2 + tcable2 + 2*tbuf) time_ax
t0 — t0(min) = (time_1 + time_2 + time_9) * T time_1, time_2r,
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. —