MPC821 datasheet(150/242 Pages) NXP

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Support Information

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

"* Configuration hold counter. Since the rise time of the HARD RESET signal

"* is relatively slow, there is a need to provide a hold time for reset

"* configuration.

ConfigHold.clk = SYSCLK;

when (SyncHardReset~.fb & !ConfigHoldEnd.fb) then ConfigHold := ConfigHold.fb +1;

else when (SyncHardReset~.fb & ConfigHoldEnd.fb) then ConfigHold := ConfigHold.fb;

else when (!SyncHardReset~.fb) then ConfigHold := 0;

ConfigHoldEnd = (ConfigHold.fb == HARD_CONFIG_HOLD_VALUE); " terminal count

!ResetConfig~ = !HardReset~;" drives RSTCONF~ to MPC8XX

!DriveConfig~ = !ConfigHoldEnd.fb; " drives configuration data on the bus.

"******************************************************************************

"* NMI generation

"******************************************************************************

equations

NMI~.oe = NMIEn;

NMI~ = 0;" O.D.

NMIEn = !RstDeb1.fb & AbrDeb1.fb;" only abort button depressed

"******************************************************************************

"* local data buffers enable

"******************************************************************************

equations

SyncHardReset~.clk = SYSCLK;

DSyncHardReset~.clk = SYSCLK;

SyncHardReset~ := HardReset~;

DSyncHardReset~ := SyncHardReset~.fb;

SyncTEA~.clk = SYSCLK;

SyncTEA~ := TEA~;

LocDataBufEn.oe = 3;

Freescale Semiconductor, Inc.

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MPC821 датащи(PDF) 150 Page - NXP Semiconductors