AD1986ABSTZ datasheet(49/56 Pages) AD

49 / 56 page

AD1986A

Rev. 0 | Page 49 of 56

FUNCTION SELECT REGISTER (REGISTER 0x66, PAGE 01)

This register is used to select which function (analog I/O pins), information and I/O (0x6801), and sense (0x6A01) registers apply to it.

The AD1986A associates FC = 0x0 with surround functions and FC = 0x01 with front functions. These are changed in the AD1986A to

align with the device pinout and to separate LINE_OUT functions.

Reg

Name

D15

D14

D13

D12

D11

D10

Default

0x661

Function

Select

FC3

FC2

FC1

FC0

T/R

0x0000

Table 113.

Function

T/R

(FIP or Ring

Selection Bit)

This bit sets which jack conductor the sense value is measured from. Software will program the corresponding rng/tp

selector bit together with the I/O number in bits FC [3:0]. Once software programs the value and properly reads it back to

confirm selection and implementation, it will access the rest of the bits fields in the descriptor. Mono inputs and outputs

should report the relevant function and sense information when T/R is set to 0 (tip). The FIP bit should report 0 (Page

0x01, Register 0x68, Bit 0 reports no function information present) when T/R is set to a 1 on a mono input or output.

T/R

Function

Tip (left channel)

Default

Ring (right channel)

These bits specify the type of audio function described by this page. These bits are read/write and represent current

AC ’97 Revision 2.2 defined I/O capabilities. Software will program the corresponding I/O number in this field together

with the tip/ring selector bit T/R. Once software programs the value and properly reads it back to confirm selection and

implementation, it will access the rest of the bits fields in the descriptor.

FC [3:0]

Function

Default

FC [3:0]

Function Code

Bits

0x0

DAC 1 (master out). maps to front DACs (L/R)

Default

0x1

DAC 2 (AUX out). maps to surround DACs (L/R)

0x2

DAC 3 (C/LFE). maps to C/LFE DACs

0x3

S/P-DIF out

0x4

Phone in

0x5

MIC_1 (Mic select = 0)

0x6

MIC_2 (Mic select = 1)

0x7

Line in

0x8

CD in

0x9

Video in

Not supported on the

AD1986A

0xA

Aux in

0xB

Mono out

0xC

Headphone ut

0xD–0xF

Reserved

Reserved.

Default: 0

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