PCM5141 Datasheet, PDF (69/110 Pages) Texas Instruments – 2VRMS DirectPath™, 112/106dB Audio Stereo DAC with 32-bit, 384kHz PCM Interface

PCM5141, PCM5142
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SLAS759A – AUGUST 2012 – REVISED SEPTEMBER 2012
Register Read/Write Operation
All read/write operations for the serial control port use 16-bit data words. Figure 81 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 81 and Figure 82 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 t_MHH in Figure 86).
MSB
LSB
IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 R/W D7 D6 D5 D4 D3 D2 D1 D0
Register Index (or Address)
Register Data
Figure 81. 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.
MS
MC
MOSI
MISO
A6 A5 A4 A3 A2 A1 A0 W D7 D6 D5 D4 D3 D2 D1 D0
HI-Z
Figure 82. Serial Control Format; Write, Single Byte
MS
MC
MOSI
MISO
ADDR
BYTE 0 BYTE 1 BYTE 2 BYTE 3 BYTE 4 BYTE 5 BYTE 6 BYTE 7
W
HI-Z
Figure 83. Serial Control Format; Write, Multiple Byte
Copyright © 2012, Texas Instruments Incorporated
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