PCM1774 datasheet(19/49 Pages) TI

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THREE-WIRE INTERFACE (SPI, MODE (PIN 28) = LOW)

MSB

IDX6

IDX5

IDX4

IDX3

IDX2

IDX1

IDX0

LSB

R0001-01

16Bits

(1)SingleWriteOperation

MSB

LSB

MSB

(2)ContinuousWriteOperation

MSB

8BitsxNFrames

NFrames

LSB MSB

LSB

MSB

LSB

8Bits

T0012-03

PCM1774

SLAS551 – JULY 2007

All write operations for the serial control port use 16-bit data words. Figure 17 shows the control data word

format. The most-significant bit must be 0. There are seven bits, labeled IDX[6:0], that set the register address

for the write operation. The least-significant eight bits, D[7:0], contain the data to be written to the register

specified by IDX[6:0].

Figure 18 shows the functional timing diagram for writing to the serial control port. To write the data into the

mode register, the data is clocked into an internal shift register on the rising edge of the MC clock. The serial

data should change on the falling edge of the MC clock, and MS should be LOW during write mode. The rising

edge of MS should be aligned with the falling edge of the last MC clock pulse in the 16-bit frame. MC can run

continuously between transactions while MS is in the LOW state.

Figure 17. Control Data Word Format for MD

Figure 18. Register Write Operation

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