MPC5121E datasheet(47/86 Pages) FREESCALE

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Electrical and Thermal Characteristics

MPC5121E/MPC5123 Data Sheet, Rev. 4

Freescale Semiconductor

3.3.9.2

PIO Mode Timing

A timing diagram for the PIO read mode is given in Figure 25.

Figure 25. PIO Read Mode Timing

To fulfill read mode timing, the different timing parameters given in Table 3-26 must be observed.

In PIO write mode, timing waveforms are somewhat different as shown in Figure 26.

Table 3-26. Timing Parameters PIO Read

ATA

Parameter

PIO Read

Mode Timing

Parameter

Value

How to meet

SpecID

t1(min) = (time_1 × T) – (tskew1 +tskew2 +tskew5)

calculate and programming

time_1. 1

1 See the MPC5121e Microcontroller Reference Manual.

A9.20

t2rt2(min) = (time_2r × T) – (tskew1 +tskew2 +tskew5)

calculate and programming

time_2r. 1

A9.21

t9(min) = (time_9 × T) – (tskew1 +tskew2 +tskew6)

calculate and programming

time_9. 1

A9.22

t5(min) = tco +tsu +tbuf +tbuf +tcable1 +tcable2

If not met, increase time_2r

A9.23

0—

A9.24

tA(min) = (1.5 + time_ax) × T –

(tco +tsui +tcable2 +tcable2 +2×tbuf)

calculate and programming

time_ax. 1

A9.25

trd

trd1

trd1(max) =(–trd)+(tskew3 +tskew4)

trd1(min) = (time_pio_rdx – 0.5 ) × T–(tsu +thi)

(time_pio_rdx – 0.5) × T > tsu +thi +tskew3 +tskew4

calculate and programming

time_pio_rdx. 1

A9.26

—t0(min) = (time_1 + time_2 + time_9) × T

time_1, time_2r, time_9

A9.27

ADDR

DIOR

Read Data (15:0)

IORDY

t2r

trd1

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