SH7721 datasheet(780/1524 Pages) RENESAS

780 / 1524 page

Section 21

Serial I/O with FIFO (SIOF)

Rev. 3.00 Jan. 18, 2008 Page 718 of 1458

REJ09B0033-0300

(2)

Control by Secondary FS (Slave Mode 2)

The CODEC normally outputs the SIOFSYNC signal as synchronization pulse (FS). In this

method, the CODEC outputs the secondary FS specific to the control data transfer after 1/2 frame

time has been passed (not the normal FS output timing) to transmit or receive control data. This

method is valid for SIOF slave mode. The following summarizes the control data interface

procedure by the secondary FS.

• Transmit normal transmit data of LSB = 0 (the SIOF forcibly clears 0).

• To execute control data transmission, send transmit data of LSB = 1 (the SIOF forcibly set to 1

by writing SITCDR).

• The CODEC outputs the secondary FS.

• The SIOF transmits or receives (stores in SIRCDR) control data (data specified by SITCDR)

synchronously with the secondary FS.

Figure 21.8 shows an example of the control data interface timing by the secondary FS.

SIOFSCK

SIOFRxD

SIOFTxD

SIOFSYNC

L-channel

data

Specifications: TRMD[1:0]=01,

TDLE=1,

RDLE=1,

CD0E=1,

REDG=0,

TDLA[3:0]=0000,

RDLA[3:0]=0000,

CD0A[3:0]=0000,

FL[3:0]=1110 (Frame length: 128 bits),

TDRE=0,

RDRE=0,

CD1E=0,

TDRA[3:0]=0000,

RDRA[3:0]=0000,

CD1A[3:0]=0000

LSB=1 (Secondary FS request)

1 frame

1/2 frame

Normal FS

Secondary FS

Control

channel 0

Slot

No.0

Slot

No.0

Figure 21.8

Control Data Interface (Secondary FS)

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