SH7721 datasheet(779/1524 Pages) RENESAS

779 / 1524 page

Section 21

Serial I/O with FIFO (SIOF)

Rev. 3.00 Jan. 18, 2008 Page 717 of 1458

REJ09B0033-0300

The number of channels in control data is specified by the CD0E and CD1E bits in SICDAR.

Table 21.8 shows the relationship between the number of channels in control data and bit settings.

Table 21.8

Setting Number of Channels in Control Data

Bit

Number of Channels

CD0E

CD1E

Note:

To use only one channel in control data, use channel 0.

21.4.5

Control Data Interface

Control data performs control command output to the CODEC and status input from the CODEC.

The SIOF supports the following two control data interface methods.

• Control by slot position

• Control by secondary FS

Control data is valid only when data length is specified as 16 bits.

(1)

Control by Slot Position (Master Mode 1, Slave Mode 1)

Control data is transferred for all frames transmitted or received by the SIOF by specifying the slot

position of control data. This method can be used in both SIOF master and slave modes. Figure

21.7 shows an example of the control data interface timing by slot position control.

SIOFSCK

SIOFRxD

SIOFTxD

SIOFSYNC

L-channel

data

R-channel

data

Specifications: TRMD[1:0]=00 or 10,

TDLE=1,

RDLE=1,

CD0E=1,

REDG=0,

TDLA[3:0]=0000,

RDLA[3:0]=0000,

CD0A[3:0]=0001,

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

TDRE=1,

RDRE=1,

CD1E=1,

TDRA[3:0]=0010,

RDRA[3:0]=0010,

CD1A[3:0]=0011

Control

channel 0

Control

channel 1

1 frame

Slot No.0

Slot No.1

Slot No.2

Slot No.3

Figure 21.7

Control Data Interface (Slot Position)

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