MPC821 datasheet(98/242 Pages) NXP

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Support Information

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

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

equations

DSCK.oe = ADS_IS_SELECTED;

when ( ADS_IS_SELECTED & !PdaSoftReset~ ) then

DSCK = H;"debug mode enable

else when ( ADS_IS_SELECTED & !TxEn.fb & PdaSoftReset~ ) then

DSCK = !DebugEntry~.fb;"debug mode direct entry

else when (ADS_IS_SELECTED & TxEn.fb & STATE_TX_ON_RISING) then

DSCK = !Clk2;"debug port clock

else when (ADS_IS_SELECTED & TxEn.fb & STATE_TX_ON_FALLING) then

DSCK = Clk2;"debug port inverted clock

else when (!ADS_IS_SELECTED) then

DSCK = H;"default value, infact X

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

"* DSDI.

"* Debug Port Serial Data in. (from MPC8XX).

"* To provide better hold time for DSDI from the last rising edge of DSCK,

"* a dedicated enable for DSDI is provided - DSDI_ENABLE.

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

equations

DsdiEn.ar = Reset;

DsdiEn.clk = IClk;

state_diagram DsdiEn

state DSDI_DISABLED:

if(HOST_WRITE_ADI_DATA & BndTmrExp.fb & !PdaRst.fb) then

DSDI_ENABLED

else

DSDI_DISABLED;

state DSDI_ENABLED:

if(STATE_TX_DISABLED # PdaRst.fb) then

DSDI_DISABLED

else

DSDI_ENABLED;

equations

DSDI.oe = ADS_IS_SELECTED & !IN_DIAG_LOOP_BACK; "avoid junk driven on DSDI input

"during diagnostic loop back mode.

when (ADS_IS_SELECTED & !PdaSoftReset~) then

DSDI = H;

else when (ADS_IS_SELECTED & !STATE_DSDI_ENABLED & PdaSoftReset~ ) then

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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