MPC821 datasheet(96/242 Pages) NXP

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MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

"* When D_C~ line is high (data) the Rx shift register contents is driven. If

"* D_C~ is low (control) the status register contents is driven.

"* The status register contains all control register's bits (4:0) with the

"* addition of the following:

"* InDebugMode: (Bit 5). When this bit is active (H), the mpc is in debug mode,

"* i.e., either Freeze or VFLS(0:1) lines are driven high.

When mpc is not in socket, VflsP(0:1) coming from the debug port

are selected.

"* TxError: (Bit 6). When this bit is active (H), it signals that the MPC8XX was

"* reset (internally) during data transmission. (i.e., data received

"* during that trnasmission is corrupted). This bit is reset (L) when

"* either happens: (1) - The interface is reset by the host (both

"*AdsHardReset and AdsSoftReset are asserted (H) by the host

"* while the board is selected). (2) - The host writes the interface with

"* D_C~ signal low (control) and with data bit 6 high. (3) - a new data

"* word is written to the Tx shift register. (I.e., error is not kept

"*indefinitely).

"* PdaRst: (Bit 7). When this bit is active (H), it means that either SRESET*

"*or HRESET* or both are driven by the MPC8XX. The host have to wait until

"* this bit negates so that data may be wrriten to the debug port.

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

equations

PDOe = DATA_BUFFERS_ENABLE ;

PD.oe = PDOe;

when ( READ_DATA_WORD_ON_ADI_BUS) then

PD = RxReg.fb;

elsewhen ( STATUS_WORD_ON_ADI_BUS ) then

PD = [PdaRst.fb, TxError.fb, InDebugMode.fb, DbgClkDivSel1.fb, DbgClkDivSel0.fb,

StatusRequest~.fb,

DiagLoopBack~.fb, DebugEntry~.fb ];

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

"* Reset Status

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

PdaRst.clk = IClk;

PdaRst := (!PdaHardReset~ # !PdaSoftReset~) &

(AdsSelect~.fb==BOARD_IS_SELECTED);

" synchronized inside.

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

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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