AD9381SLASHPCB datasheet(33/44 Pages) AD

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AD9381

Rev. 0 | Page 33 of 44

0x87—Bits[6:0] New Data Flags (NDF)

This register indicates whether data in specific sections has

changed. In the address space from 0x80 to 0xFF, each register

address ending in 0b111 (for example, 0x87, 0x8F, 0x97, 0xAF)

is an NDF register. They all have the same data and all are reset

upon reading any one of them.

Table 29.

NDF Bit number

Changes Occurred

AVI infoframe

Audio infoframe

SPD infoframe

MPEG source infoframe

ACP packets

ISRC1 packets

ISRC2 packets

0x88—Bits[7:0] Active Line Start MSB

See Register 0x86.

0x89—Bits[7:0] Active Line End LSB

Combined with the MSB in Register 0x8A, these bits indicate

the last line of active video. All lines past this comprise a lower

horizontal bar. This is used in letter-box modes. If the 2-byte

value is greater than the number of lines in the display, there is

no lower horizontal bar.

0x8A—Bits[7:0] Active Line End MSB

See Register 0x89.

0x8B—Bits[7:0] Active Pixel Start LSB

Combined with the MSB in Register 0x8C, these bits indicate

the first pixel in the display that is active video. All pixels before

this comprise a left vertical bar. If the 2-byte value is 0x00, there

is no left bar.

0x8C—Bits[7:0] Active Pixel Start MSB

See Register 0x8B.

0x8D—Bits[7:0] Active Pixel End LSB

Combined with the MSB in Register 0x8E, these bits indicate

the last active video pixel in the display. All pixels past this

comprise a right vertical bar. If the 2-byte value is greater than

the number of pixels in the display, there is no vertical bar.

0x8E—Bits[7:0] Active Pixel End MSB

See Register 0x8D.

0x8F—Bits[6:0] NDF

See Register 0x87.

0x90—Bits[7:0] Audio Infoframe Version

0x91—Bits[7:4] Audio Coding Type

These bits identify the audio coding so that the receiver may

process audio properly.

Table 30.

CT [3:0]

Audio Coding

0x0

Refer to stream header

0x1

IEC60958 PCM

0x2

AC-3

0x3

MPEG1 (Layer 1 and Layer 2)

0x4

MP3 (MPEG1 Layer 3)

0x5

MPEG2 (multichannel)

0x6

AAC

0x7

DTS

0x8

ATRAC

0x91—Bits[2:0] Audio Channel Count

These bits specify how many audio channels are being sent—

2 channels to 8 channels.

Table 31.

CC [2:0]

Channel Count

000

Refer to stream header

001

010

011

100

101

110

111

0x92—Bits[4:2] Sampling Frequency

0x92—Bits[1:0] Ample Size

0x93—Bits[7:0] Max Bit Rate

For compressed audio only, when this value is multiplied by

8 kHz represents the maximum bit rate. A value of 0x08 in this

field yields a maximum bit rate of (8 kHz × 8 kHz = 64 kHz).

0x94—Bits[7:0] Speaker Mapping

These bits define the suggested placement of speakers.

Table 32.

Abbreviation

Speaker Placement

Front left

Front center

Front right

FCL

Front center left

FCR

Front center right

Rear left

Rear center

Rear right

RCL

Rear center left

RCR

Rear center right

LFE

Low frequency effect

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