PCM1741ESLASH2K datasheet(10/24 Pages) TI2

10 / 24 page

PCM1741

SBAS175

FIGURE 5. Control Data Word Format for MDI.

FIGURE 6. Register Write Operation.

SERIAL CONTROL INTERFACE

The serial control interface is a 3-wire serial port that

operates asynchronously to the serial audio interface. The

serial control interface is utilized to program the on-chip

mode registers. The control interface includes MD (pin 13),

MC (pin 14), and ML (pin 15). MD is the serial data input,

used to program the mode registers, MC is the serial bit

clock, used to shift data into the control port, and ML is the

control port latch clock.

All write operations for the serial control port use 16-bit data

words. Figure 5 shows the control data word format. The

most significant bit must be a “0”. There are seven bits,

labeled IDX[6:0], that set the register index (or 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 6 shows the functional timing diagram for writing the

serial control port. ML is held at a logic “1 ” state until a

ML is set to logic “0”. Sixteen clocks are then provided on

MC, corresponding to the 16 bits of the control data word on

MD. After the sixteenth clock cycle has completed, ML is set

to logic “1” to latch the data into the indexed mode control

CONTROL INTERFACE TIMING REQUIREMENTS

See Figure 7 for a detailed timing diagram of the serial

control interface. These timing parameters are critical for

proper control port operation.

FIGURE 4. Audio Interface Timing.

SYMBOL

PARAMETER

MIN

MAX

UNITS

tBCY

BCK Pulse Cycle Time

32, 48, or 64fS(1)

tBCH

BCK High Level Time

tBCL

BCK Low Level Time

tBL

BCK Rising Edge to LRCK Edge

tLB

LRCK Falling Edge to BCK Rising Edge

tDS

DATA Set Up Time

tDH

DATA Hold Time

NOTE: (1) fS is the sampling frequency (e.g., 44.1kHz, 48kHz, 96kHz, etc.)

LRCK

BCK

DATA

50% of V

BCH

BCL

BCY

IDX5

IDX6

IDX4

IDX2

IDX3

IDX1 IDX0

MSB

LSB

D6D5

D3D2

IDX6

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0

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