MPC8260 datasheet(10/16 Pages) FREESCALE

Il numero della parte	MPC8260

Spiegazioni elettronici	UPM Timing Diagram

PDF	16 Pages

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Produttore elettronici	FREESCALE [Freescale Semiconductor, Inc]

Homepage	http://www.freescale.com

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MPC8260 UPM Timing Diagram, Rev. 2

Freescale Semiconductor

UPM Timings

Figure 5 shows the UPM with two consecutive WAEN.

Figure 5. UPM with Two Consecutive WAEN

CLKIN

ADDR

DATA

PSDVAL

PGPLx

addr

Note:

1 Minimum RAM words for UPWAIT to take effect:

00: 08ea a800

01: 00a0 0000

02: 00a0 1000 // WAEN=1

03: 00a0 1000 // WAEN=1

04: 01b5 4405

2 WAEN needs to be set in two consecutive RAM words. The UPM waits at the second RAM word. Figure 6 shows

what happens if only one WAEN is set.

3 Due to synchronization of UPWAIT, the internal UPWAIT is two cycles later than external UPWAIT. If the external

UPWAIT goes active half a cycle after CS is active, the first WAEN that has an effect is at RAM address 02 for

a read. Even if WAEN values of 00 and 01 are configured, the UPM does not wait because UPWAIT has not

arrived yet due to delay.

UPWAIT

internal

UPWAIT

MPC8260 Scheda tecnica(PDF) 10 Page - Freescale Semiconductor, Inc