Production Data

WM8716

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PD, Rev 4.2, August 2008

13

SOFTWARE CONTROL INTERFACE

The WM8716 can be controlled using a 3-wire serial interface. MD/DM0 (pin 26) is used for the

program data, MC/DM1 (pin 22) is used to clock in the program data and ML/I2S (pin 28) is use to

latch in the program data. The 3-wire interface protocol is shown in Figure 6. CSB/IWO (pin 23) must

be low when writing.

ML/I2S (PIN 28)

MC/DM1 (PIN 27)

MD/DM0 (PIN 26)

B15 B14 B13

B2

B1

B0

Figure 6 Three-Wire Serial Interface

REGISTER MAP

WM8716 controls the special functions using 4 program registers, which are 16-bits long. These

registers are all loaded through input pin MD/DM0. After the 16 data bits are clocked in, ML/I2S is

used to latch in the data to the appropriate register. Table 5 shows the complete mapping of the

4 registers. Note that in hardware differential mode and 8X modes, software control is not available.

The hardware differential mode (Diff[1:0]) clock loss detector disable (CDD) can only be accessed by

writing to M2[8:5] with the pattern 1111. Register M4 is then accessible by setting A[2:0] to 110.

B15

B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

M0

-

-

-

-

A2 (0) A1(0) A0(0)

LDL

AL7

AL6

AL5

AL4

AL3

AL2

AL1

AL0

M1

-

-

-

-

A2(0) A1(0) A0(1)

LDR

AR7

AR6

AR5

AR4

AR3

AR2

AR1

AR0

M2

-

-

-

-

A2(0) A1(1) A0(0)

-

-

-

-

IW1

IW0

OPE

DEM

MUT

M3

-

-

-

-

A2(0) A1(1) A0(1)

IZD

SF1

SF0

CK0

REV

SR0

ATC

LRP

M4

-

-

-

-

A2(1) A1(1) A0(0)

-

-

CDD DIFF1 DIFF0

-

-

-

-

Table 5 Mapping of Program Registers