TLC32046MFKB datasheet(27/56 Pages) TI

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2–13

FSR

FSX

Period A

Receive Conversion

Transmit Conversion Period

Period B

Receive Conversion

Figure 2–5. More Than One Receive Frame Sync Between Two Transmit Frame Syncs

2.22 More Than One Transmit Frame Sync Occurring Between Two Receive

Frame Syncs – Asynchronous Operation

When incrementally adjusting the conversion period via the A + A

′ or A – A′ register options, a specific

protocol must be followed. For both transmit and receive conversion periods, the incremental conversion

period adjustment is performed near the end of the conversion period. The command to use the incremental

conversion period adjust options is sent to the AIC during an FSX frame sync. The ongoing transmit

conversion period is then adjusted. However, three possibilities exist for the receive conversion period

adjustment as shown in Figure 2–6. When the adjustment command is issued during transmit conversion

period A, receive conversion period A is adjusted if there is sufficient time between t1 and t2. If there is not

sufficient time between t1 and t2, receive conversion period B is adjusted. The third option is that the receive

portion of an adjustment command can be ignored if the adjustment command is sent during a receive

conversion period, which is adjusted due to a prior adjustment command. For example, if adjustment

commands are issued during transmit conversion periods A, B, and C, the first two commands may cause

receive conversion periods A and B to be adjusted, while the third receive adjustment command is ignored.

The third adjustment command is ignored since it was issued during receive conversion period B, which

already is adjusted via the transmit conversion period B adjustment command.

FSR

FSX

Receive Conversion Period B

Receive Conversion Period A

Period C

Conversion

Transmit

Period B

Conversion

Transmit

Period A

Conversion

Transmit

Figure 2–6. More Than One Transmit Frame Sync Between Two Receive Frame Syncs

2.23 More than One Set of Primary and Secondary DX Serial Communications

Occurring Between Two Receive Frame Syncs (See DX Serial Data Word

Format section) – Asynchronous Operation

The TA, TA

′, TB, and control register information that is transmitted in the secondary communication is

accepted and applied during the ongoing transmit conversion period. If there is sufficient time between t1

and t2, the TA, RA′, and RB register information, sent during transmit conversion period A, is applied to

receive conversion period A; otherwise, this information is applied during receive conversion period B. If RA,

′, and RB register information has been received and is being applied during an ongoing conversion

period, any subsequent RA, RA

′, or RB information received during this receive conversion period is

disregarded (see Figure 2–7).

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