MPC821 datasheet(93/242 Pages) NXP

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MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

TxReg0 := RxReg0.fb;

else

TxReg0 := TxReg0.fb;

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

"* Receive Shift Register.

"* A single stage shift register used as a source for the Tx shift register.

"* In normal mode the input for the Rx shift register is the MPC8XX's DSDO, while

"* in diagnostic loopback mode, data is taken directly from the Tx shift

"* serial output.

"* The output of the Rx shift register is fed to the input of the Tx shift

"* register. When transmission (and reception) is done the received data

"* word is compossed of the Rx shift register (LSB) concatenated with the

"* 7 LSBs of the Tx shift register.

"* The edge (in Clk2 terms) upon which data is shifted in is determined by

"* TxClkSns as with the Tx shift register but on opposite edges, i.e.,

"* data is shifted Out from the Tx shift register on the Falling edge of

"* DSCK while is shifted In to the Rx shift register on the Rising edge

"* DSCK. (DSCK terms are constant in that regard).

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

equations

RxReg0.clk = IClk;

RxReg0.ar = Reset;

when ( STATE_TX_ENABLED & STATE_TX_ON_RISING & Clk2 #

STATE_TX_ENABLED & STATE_TX_ON_FALLING & !Clk2) & (!IN_DIAG_LOOP_BACK) then

RxReg0.d = DSDO;

"shift in ext data

else when ( STATE_TX_ENABLED & STATE_TX_ON_RISING & Clk2 #

STATE_TX_ENABLED & STATE_TX_ON_FALLING & !Clk2) & IN_DIAG_LOOP_BACK then

RxReg0.d = TxReg7.fb;"

shift in from transmit reg

else

RxReg0.d = RxReg0.fb;" hold value

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

"* AdsReq.

"* Host from ads, read acknowledge. This state machine generates an automatic

"* ADS read request from the host when either a byte of data is received in the

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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