TP3420AV datasheet(30/32 Pages) NSC

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SC1 Messaging Sequence (Continued)

Time

SC1

Actions Required

(ms)

I430 Frame Content

0 (MFC INT)

(LRS)

if FL__EXT flag set, do not check for new flags on SC1L, but check for

SC2 channel. Reset FL__EXT. Send SC2 command as appropriate.

SC1L__NB (IDLE) > MFT1L

(LRS)

0 (MFC INT)

(IDLE)

if FL__EXT flag not set, check for new flags on SC1L, assume LB1I.

Check for SC2 channel. Send SC2 command as appropriate.

SC1__NB(IDLE) > SC1__PB, SC1 command (LBL1I) > SC1__NB,

SC1__NB(LB1I) > MFT1L.

(IDLE)

0 (MFC INT)

(LB1I)

if FL__EXT flag not set, Check for new flags on SC1L assume LB2I.

Check for SC2 channel. Send SC2 command as appropriate.

SC1__NB(LB1I) > SC1__PB, SC1 command(LB2I) > SC1__NB,

SC1__NB(LB2I) > MFT1L

(LB1I)

0 (MFC INT)

(LB2I)

if FL__EXT flag not set, check for new flags on SC1L, assume IDLE.

Check for SC2 channel. Send SC2 command as appropriate.

SC1__NB(LB2I) > SC1__PB, SC1 command (IDLE) > SC1__NB

SC1__ NB(IDLE) > MFT1L.

(LB2I)

0 (MFC INT)

(IDLE)

etc.

On the TE receive side, the LP, DTSE and FECV messages

are checked once, and for every occurrence an interrupt

is generated. The other messages are validated 3 times be-

fore an interrupt is generated. Subsequent repetitions of the

command do not cause an interrupt.

SC2 CHANNEL TRANSMITTER HANDLING

The software should keep a list of flags to indicate SC2 com-

mands as defined in the spec. At the 30 ms tick MFC INT, the

software should scan through the list of flags (top down) and,

seeing the first flag, should write the appropriate command

in the MFT2 register and keep the value in SC2__NB (soft-

ware buffer).

On the TE receive side, the SC2 command is verified 3

times before an Interrupt is generated. Subsequent repeti-

tions of the command do not cause an interrupt.

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