AD9381SLASHPCB datasheet(13/44 Pages) AD

13 / 44 page

AD9381

Rev. 0 | Page 13 of 44

AUDIO BOARD LEVEL MUTING

The audio can be muted through the infoframes or locally

via the serial bus registers. This can be controlled with

AVI Infoframes

The HDMI TMDS transmission contains Infoframes with

specific information for the monitor such as:

•

Audio information

•

2 to 8 channels of audio identified

•

Audio coding

•

Audio sampling frequency

•

Speaker placement

•

N and CTS values (for reconstruction of the audio)

•

Muting

•

Source information

•

SACD

•

DVD

•

Video information

•

Video ID code (per CEA861B)

•

Color space

•

Aspect ratio

•

Horizontal and vertical bar information

•

MPEG frame information (I, B, or P frame)

•

Vendor (transmitter source) name and product model

This information is the fundamental difference between DVI

and HDMI transmissions and is located in read-only registers

R0x5A to R0xEE. In addition to this information, registers are

provided to indicate that new information has been received.

Registers with addresses ending in 0xX7 or 0xXF beginning at

R0x87 contain the new data flags (NDF) information. All of

these registers contain the same information and all are reset

once any of them are read. Although there is no external

interrupt signal, it is easy for the user to read any of these

registers and see if there is new information to be processed.

OUTPUT DATA FORMATS

The AD9398 supports 4:4:4, 4:2:2, double data-rate (DDR),

and BT656 output formats. Register 0x25[3:0] controls the

output mode. These modes and the pin mapping are shown

in Table 10.

Table 10.

Port

Red

Green

Blue

Bit

4:4:4

Red/Cr [7:0]

Green/Y [7:0]

Blue/Cb [7:0]

4:2:2

CbCr [7:0]

Y [7:0]

DDR 4:2:2 ↑ CbCr ↓ Y, Y

DDR ↑ 1 G [3:0]

DDR ↑ B [7:4]

DDR ↑ B [3:0]

DDR 4:2:2 ↑ CbCr [11:0]

4:4:4 DDR

DDR ↓ R [7:0]

DDR ↓ G [7:4]

DDR 4:2:2 ↓ Y,Y [11:0]

4:2:2 to 12

CbCr [11:0]

Y [11:0]

1 Arrows in the table indicate clock edge. Rising edge of clock =

↑, falling edge = ↓.

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