MPC5123 datasheet(50/86 Pages) FREESCALE

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MPC5121E/MPC5123 Data Sheet, Rev. 4

Electrical and Thermal Characteristics

Freescale Semiconductor

3.3.9.4

UDMA In Timing Diagrams

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

given:

•

Figure 29 gives timing for UDMA in transfer start

•

Figure 30 gives timing for host terminating UDMA in transfer

•

Figure 31 gives timing for device terminating UDMA in transfer.

Table 3-28. Timing Parameters MDMA Read and Write

ATA

Parameter

MDMA

Read/Write

Timing

Parameter

Value

How to meet

SpecID

tm, ti

tm(min) =ti(min) =(time_m ×T)–(tskew1 +tskew2 +tskew5)

calculate and

programming

time_m. 1

1 See the MPC5121e Microcontroller Reference Manual.

A9.40

td, td1

td1(min) =td(min) =(time_d ×T) – (tskew1 + tskew2 + tskew6)

calculate and

programming

time_d. 1

A9.41

tk(min) =(time_k ×T)–(tskew1 + tskew2 + tskew6)

calculate and

programming

time_k. 1

A9.42

—t0(min) = (time_d + time_k) × T

time_d, time_k

A9.43

tg(read)

tgr

tgr(min-read) =tco +tsu +tbuf +tbuf +tcable1 +tcable2

tgr(min-drive) = td – te(drive)

time_d. 1

A9.44

tf(read)

tfr

tfr(min-drive) = 0

—

A9.45

tg(write)

—tg(min-write) =time_d×T–(tskew1 + tskew2 + tskew5)

time_d

A9.46

tf(write)

—tf(min-write)=time_k ×T–(tskew1 + tskew2 + tskew6)

time_k

A9.47

—tL(max) = [(time_d + time_k – 2) × T]

– [tsu +tco +(2×tbuf)+(2 ×tcable2)]

time_d, time_k

A9.48

tn, tj

tkjn

tn =tj =tkjn = [max(time_k,. time_jn) × T]

–(tskew1 + tskew2 + tskew6)

calculate and

programming

time_jn. 1

A9.49

—ton

toff

ton = (time_on × T) – tskew1

toff = (time_off × T) – tskew1

—

A9.50

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