MPC821 datasheet(90/242 Pages) NXP

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Support Information

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

AdsAck.ar

= Reset;

AdsAck.oe

= ADS_IS_SELECTED;

S_HstReq.clk = IClk;

DS_HstReq.clk = IClk;

S_HstReq := HstReq;

DS_HstReq := S_HstReq.fb & HstReq;"double synced

S_D_C~.clk = IClk;" synchronizing D_C~ selector

S_D_C~ := D_C~;

state_diagram AdsAck

state !ADS_ACK_ACTIVE:

if ( (HOST_WRITE_ADI_CONTROL #

(HOST_WRITE_ADI_DATA & !PdaRst.fb) )

& BndTmrExp.fb) then

ADS_ACK_ACTIVE

else

!ADS_ACK_ACTIVE;

state ADS_ACK_ACTIVE:

if ( DS_HstReq.fb==!HOST_REQ_ACTIVE ) then

!ADS_ACK_ACTIVE

else

ADS_ACK_ACTIVE;

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

"* Transmit Enable logic.

"* Enables transmit of serial data over DSDI and generation of serial

"* clock over DSCK.

"* Transmission begins immediately after data written by the host is latched

"* into the transmit shift register and ends after 7 shifts were made to the

"* tx shift register.

"* Termination is done using a 4 bit counter TxWordLength which has a terminal

"* count (and reset) TxWordEnd.

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

equations

TxEn.ar = Reset;

TxEn.clk = IClk;" to provide 1/2 clock resolution

state_diagram TxEn

state TX_DISABLED:

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

TX_ENABLED

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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