MPC821 datasheet(92/242 Pages) NXP

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Support Information

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

TX_ON_FALLING

else

TX_ON_RISING;

state TX_ON_FALLING:

if (HOST_WRITE_ADI_DATA & BndTmrExp.fb & !Clk2) then

TX_ON_RISING

else

TX_ON_FALLING;

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

"* Tx shift Register.

"* 8 bits shift register which either shifts data out (MSB first) or holds

"* its data. The edge (in Clk2 terms) upon which the above actions are taken,

"* is determined by TxClkSns. The Tx shift register operates according to IClk.

"* The Tx shift register is 1'st written by the host (data cycle) and along

"* with write being acknowledged to the host data is shifted out via DSDI.

"* In order of saving logic, the Tx shift register is shared with the Receive

"* shift register, this, due to the fact that when a bit is shifted out a FF

"* becomes available. Since the Tx shift register is shifted MSB first, its

"* LSB FFs are grdualy becoming available for received data.

"* To provide a 1/2 DSCK hold time for DSDI, a single FF receive SR is used

"* which is the source for the Tx shift register. (if 0 hold is required

"* for DSDI this FF may be ommited)

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

equations

TxReg.clk = IClk;

TxReg.ar = Reset;

when ( HOST_WRITE_ADI_DATA & BndTmrExp.fb & !STATE_TX_ENABLED) then

[TxReg7..TxReg1] := [PD7..PD1].pin;

" latching ADI data

else when (STATE_TX_ENABLED & STATE_TX_ON_RISING & !Clk2 #

STATE_TX_ENABLED & STATE_TX_ON_FALLING & Clk2) then

[TxReg7..TxReg1] := [TxReg6..TxReg0].fb;

" shifting out MSB 1'st.

else

[TxReg7..TxReg1] := [TxReg7..TxReg1].fb;

" Holding value.

when ( HOST_WRITE_ADI_DATA & BndTmrExp.fb & !STATE_TX_ENABLED) then

TxReg0 := PD0.pin;

else when (STATE_TX_ENABLED & STATE_TX_ON_RISING & !Clk2 #

STATE_TX_ENABLED & STATE_TX_ON_FALLING & Clk2) then

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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