AD9398SLASHPCB datasheet(13/44 Pages) AD

13 / 44 page

AD9398

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 channels 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 flag (NDF) information. 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 very easy for the user to read any of these registers to

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 listed 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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