PCIMX258CJM4A datasheet(51/144 Pages) FREESCALE

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i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 3

Freescale Semiconductor

Figure 19 shows timing for host-terminated UDMA out-transfer.

Figure 19. Timing for Host-Terminated UDMA Out-Transfer

Timing parameters for UDMA out-bursts are listed in Table 38.

Table 38. Timing Parameters UDMA Out-Bursts

ATA

Parameter

Spec

Parameter

Value

How to Meet?

tack

tack(min.) = (time_ack

× T) – (tskew1 + tskew2)

time_ack

tenv

tenv(min.) = (time_env

× T) – (tskew1 + tskew2)

tenv(max.) = (time_env

× T) + (tskew1 + tskew2)

time_env

tdvs

tdvs = (time_dvs

× T) – (tskew1 + tskew2)

time_dvs

tdvh

tdvs = (time_dvh

× T) – (tskew1 + tskew2)

time_dvh

tcyc

tcyc = time_cyc

× T – (tskew1 + tskew2)

time_cyc

t2cyc

—

t2cyc = time_cyc

× 2 × T

time_cyc

trfs1

trfs

trfs = 1.6

× T + tsui + tco + tbuf + tbuf

—

tdzfs

tdzfs = time_dzfs

× T – (tskew1)

time_dzfs

tss

tss = time_ss

× T – (tskew1 + tskew2)

time_ss

tmli

tdzfs_mli

tdzfs_mli =max.(time_dzfs, time_mli)

× T – (tskew1 + tskew2)

—

tli

tli1

tli1 > 0

—

tli

tli2

tli2 > 0

—

tli

tli3

tli3 > 0

—

tcvh

tcvh = (time_cvh

× T) – (tskew1 + tskew2)

time_cvh

—ton

toff

ton = time_on

× T – tskew1

toff = time_off

× T – tskew1

—

DMARQ

ADDR

DIOW

DIOR

DMACK

DATA WRITE

buffer_en

tack

tcvh

toff

tss

tcyc

IORDY

tli2

tli3

tdzfs_mli

tcyc1

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