ML7204-003 datasheet(55/214 Pages) LAPIS

55 / 214 page

FEDL7204-003-02

ML7204-003

55/214

Description of operation (Figure 33)

 Performing single-channel operation

 Transmit

Operates according to the contents described in Operation and Error processing in Figure 17.

 Receive

Operates according to the contents described in Operation and Error processing in Figure 21. The

G.711PLC function enable control register (G711_PLCEN) must be set to “0” at activation of Speech CODEC.

 Activating 2-channel operation

To change the mode from a single-channel operation mode to a 2-channel operation mode, set DC_EN = 1 (&

SC_EN = 1).

Encoder: Starts encoding signals from CH1 and CH2 after processing of up to one frame following the setting of

DC_EN = 1.

Decoder: Starts two receive data write requests in one frame after processing of up to one frame following the

setting of DC_EN = 1.

(Note)

When G.729.A is selected as the Speech CODEC coding format, the setting of SC_EN = DC_EN = 1 is

inhibited.

When the G.711 PLC function is enabled, the setting of SC_EN = DC_EN = 1 is inhibited.

 Performing 2-channel operation

 Transmit

 2-channel transmit request notification register (TXREQ_DC)

The 2-channel transmit request notification register (TXREQ_DC) is set to “1” while two transmit data read

requests are issued in one frame.

 Channel data read sequence

Two transmit data read requests are issued in one frame in the order of CH1

 CH2.

However, when read operation from the MCU side does not terminate for the CH1 transmit data read request, a

read request for CH2 transmit data is not issued.

 Read sequence

After encoding processing for CH1 and CH2 of one frame terminates, an interrupt is generated by setting

FR0_CH1 and a CH1 transmit data read request is issued. Read CH1 transmit data (160 bytes) according to

the read request.

When CH1 transmit data read processing terminates, an interrupt is generated by setting FR0_CH2 = 1 and a

CH2 transmit data read request is issued.

Read CH2 transmit data (160 bytes) according to the read request.

In this operation state, the following signals are input to the encoder from CH1 and CH2.

Encoder input signal (CH1) = (Transmit data AIN_x input to Speech CODEC) + (CH2 receive data

Rx_CH2)

Encoder input signal (CH2) = (Transmit data AIN_x input to Speech CODEC) + (CH1 receive data

Rx_CH1)

 Valid read period RE_DCn(CH1 & CH2)

Terminate transmit data read processing from CH1 and CH2 within 18.0 ms after a CH1 transmit data read

request (FR0_CH1 = 1) is issued.

ML7204-003 Datasheet(PDF) 55 Page - LAPIS Semiconductor Co., Ltd.

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