MPC821 datasheet(91/242 Pages) NXP

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Support Information

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

else

TX_DISABLED;

state TX_ENABLED:

if(TxWordEnd # PdaRst.fb) then

TX_DISABLED

else

TX_ENABLED;

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

"* Transmit Length Counter. This counter determines the length of transmission

"* towards the MPC. The fast clock is used here to allow 1/2 clock resolution

"* with the negation of TxEn, which enables DSCK outside.

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

equations

TxWordLen.ar = Reset;

TxWordLen.clk = IClk;

TxWordEnd = (TxWordLen.fb == TX_WORD_LENGTH);

when ( STATE_TX_ENABLED & !TxWordEnd & !PdaRst.fb) then

TxWordLen.d = TxWordLen.fb + 1;

else

TxWordLen.d = 0;

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

"* TxClkSns - Transmit Clock Sense.

"* Since Host req is synced acc to IClk and may be detected active when Clk2 is

"* either '1' or '0', DSCK and the clock according to which DSDI is sent and

"* DSDO is sampled should be changed.

"* When TxClkSns is '0' - DSCK will be !Clk2 while transmit will be done

according to Clk2 and recieve by !Clk2.

"* When TxClkSns is '1' - DSCK will be Clk2 while transmit will be done

according to !Clk2~ and recieve by Clk2.

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

equations

TxClkSns.clk = IClk;

TxClkSns.ar = Reset;

state_diagram TxClkSns

state TX_ON_RISING:

if (HOST_WRITE_ADI_DATA & BndTmrExp.fb & Clk2) then

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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