MPC5554 datasheet(33/58 Pages) FREESCALE

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Electrical Characteristics

MPC5554 Microcontroller Data Sheet, Rev. 4

Freescale Semiconductor

3.13.4

External Bus Interface (EBI) Timing

Table 22 lists the timing information for the external bus interface (EBI).

Table 22. Bus Operation Timing1

Spec

Characteristic

and

Description

Symbol

External Bus Frequency 2, 3

Unit

Notes

40 MHz

56 MHz

66 MHz

Min.

Max.

Min.

Max.

Min.

Max.

CLKOUT period

24.4

—

17.5

—

15.2

—

Signals are measured

at 50% VDDE.

CLKOUT duty cycle

tCDC

45%

55%

45%

55%

45%

55%

CLKOUT rise time

tCRT

——4

CLKOUT fall time

tCFT

——4

CLKOUT positive edge to output

signal invalid or Hi-Z (hold time)

External bus interface

BG 5

BR 6

CS[0:3]

ADDR[8:31]

DATA[0:31] 7

BDIP

RD_WR

TEA 8

TSIZ[0:1]

WE/BE[0:3] 9

tCOH

1.010

1.5

—

1.010

1.5

—

1.010

1.5

—ns

EBTS = 0

EBTS = 1

Hold time selectable

via SIU_ECCR

[EBTS] bit.

CLKOUT positive edge to output

signal valid (output delay)

External bus interface

BG 5

BR 6

CS[0:3]

ADDR[8:31]

DATA[0:31] 7

BDIP

RD_WR

TEA 8

TSIZ[0:1]

WE/BE[0:3] 9

tCOV

—

10.010



11.0

—

7.510

8.5

—

6.010

7.0

EBTS = 0

EBTS = 1

Output valid time

selectable via

SIU_ECCR

[EBTS] bit.

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