MPC5121E datasheet(53/86 Pages) FREESCALE

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Electrical and Thermal Characteristics

MPC5121E/MPC5123 Data Sheet, Rev. 4

Freescale Semiconductor

3.3.9.5

UDMA Out Timing Diagrams

UDMA mode timing is more complicated than PIO mode or MDMA mode. In this section, timing diagrams for UDMA out are

given:

•

Figure 32 gives timing for UDMA out transfer start

•

Figure 33 gives timing for host terminating UDMA out transfer

•

Figure 34 gives timing for device terminating UDMA out transfer.

Table 29. Timing Parameters UDMA in Burst

ATA

Parameter

UDMA In

Timing

Parameter

Value

How to Meet

SpecID

tack

tack(min) = (time_ack × T) – (tskew1 +tskew2)

calculate and

programming time_ack. 1

1 See the MPC5121e Microcontroller Reference Manual.

A9.51

tenv

tenv(min) = (time_env × T) – (tskew1 +tskew2)

tenv(max) = (time_env × T) + (tskew1 +tskew2)

calculate and

programming time_env. 1

A9.52

tds

tds1

tds –(tskew3) – ti_ds > 0

tskew3, ti_ds, ti_dh should

be low enough

A9.53

tdh

tdh1

tdh –(tskew3) – ti_dh > 0

A9.54

tcyc

tc1

(tcyc –tskew ) > T

Bus clock period T big

enough

A9.55

trp

trp(min) = time_rp × T – (tskew1 +tskew2 +tskew6)

calculate and

programming time_rp. 1

A9.56

—

tx1

2 A special timing requirement in the ATA host requires the internal DIOW to go only high three clocks after the last active edge

on the DSTROBE signal. The equation given on this line tries to capture this constraint.

(time_rp × T) – [tco + tsu + 3T + (2 × tbuf) + (2 × tcable2)] >

trfs (drive)

calculate and

programming time_rp. 1

A9.57

tmli

tmli1

tmli1(min) = (time_mlix + 0.4) × T

calculate and

programming time_mlix. 1

A9.58

tzah

tzah(min) = (time_zah + 0.4) × T

calculate and

programming time_zah. 1

A9.59

tdzfs

tdzfs =(time_dzfs ×T)– (tskew1 +tskew2)

calculate and

programming time_dzfs. 1

A9.60

tcvh

tcvh =(time_cvh ×T)– (tskew1 +tskew2)

calculate and

programming time_cvh. 1

A9.61

—

ton

toff

3 Make t

on and toff large enough to avoid bus contention.

ton =(time_on×T) –tskew1

toff =(time_off ×T)–tskew1

—

A9.62

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