PCM1865DBT datasheet(43/115 Pages) TI

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MOSI

MISO

HI-z

IDX6

IDX5 IDX4

IDX3 IDX2

IDX1 IDX0

MSB

LSB

R/W

PCM1861, PCM1863, PCM1865

www.ti.com

SLAS831C – MARCH 2014 – REVISED AUGUST 2014

Table 18. MD1 - I2C Address or SPI Chip Select

Mode

MD1 Usage

Static MD1 Value

Configuration

I2C

Address pin

Low

I2C Address: 0x94

I2C

Address pin

High

I2C Address: 0x96

SPI

MS (SPI Chip Select)

N/A

8.19.3 SPI Interface

The SPI interface is a 4-wire synchronous serial port which operates asynchronously to the serial audio interface

and the system clock (SCK). The serial control interface is used to program and read the on-chip mode registers.

The control interface includes MISO, MOSI , MC, and MS. MISO (Master In Slave Out) is the serial data output,

used to read back the values of the mode registers; MOSI (Master Out Slave In) is the serial data input, used to

program the mode registers.

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

active-low mode control enable, used to enable the internal mode register access. If data from the device is not

required, the MISO pin can be assigned to GPIO1 by register control.

8.19.3.1 Register Read/Write Operation

All read/write operations for the serial control port use 16-bit data words. Figure 39 shows the control data word

format. The most significant bit is the read/write (R/W) 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 40 and Figure 41 show the functional timing diagram for writing or reading through the serial control port.

MS should be held at logic 1 state until a register needs to be written or read. To start the register write or read

cycle, MS should be set to logic 0. Sixteen clocks are then provided on MC, corresponding to the 16 bits of the

control data word on MOSI and readback 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 should be set to logic 1 once.

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.

Figure 39. Control Data Word Format for MDI

Figure 40. Serial Control Format for Write

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