PCM5142 datasheet(53/123 Pages) TI2

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IDX6

IDX5

IDX4

IDX3

IDX2

IDX1

IDX0

MSB

LSB

R/W

PCM5141, PCM5142

www.ti.com

SLAS759B – AUGUST 2012 – REVISED JANUARY 2016

Device Functional Modes (continued)

MC is the serial bit clock, used to shift data in and out of the control port by falling edge of MC, and MS is the

mode control enable with LOW active, used to enable the internal mode register access. If feedback from the

device is not required, the MISO pin can be assigned to GPIO1 by register control.

8.4.1.1.1.1

All read/write operations for the serial control port use 16-bit data words. Figure 68 shows the control data word

format. The most significant bit is the read/write bit. For write operations, the bit must be set to 0. For read

operations, the bit must be set to 1. There are seven bits, labeled IDX[6:0], that hold the register index (or

address) for the read and write operations. The least significant eight bits, D[7:0], contain the data to be written

to, or the data that was read from, the register specified by IDX[6:0].

Figure 68 and Figure 69 show the functional timing diagram to write or read through the serial control port. MS is

held at a logic-1 state until a register access. To start the register write or read cycle, set MS to logic 0. Sixteen

clocks are then provided on MC, corresponding to the 16 bits of the control data word on MOSI and read-back

data on MISO. After the eighth clock cycle has completed, the data from the indexed-mode control register

appears on MISO during the read operation. After the sixteenth clock cycle has completed, the data is latched

into the indexed-mode control register during the write operation. To write or read subsequent data, MS is set to

logic 1 once (see tMHH in Figure 73).

Figure 68. Control Data Word Format; MDI

NOTE

B8 is used for selection of Write or Read. Setting = 0 indicates a Write, while = 1 indicates

a Read. Bits 15–9 are used for register address. Bits 7–0 are used for register data.

Multiple-byte write or read (up to 8 bytes) is supported while MS is kept low. The address

field becomes the initial address, automatically incrementing for each byte.

Figure 69. Serial Control Format; Write, Single Byte

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