AD9389SLASHPCB datasheet(18/48 Pages) AD

18 / 48 page

AD9389

Rev. 0 | Page 18 of 48

The AD9389 has two modes for CTS generation: manual mode

and auto mode. In manual mode, the user can program the CTS

number directly into the chip (0x07 to 0x09) and select this

external mode by setting 0x0A[7] to 1. In auto mode, the chip

computes the CTS based on the actual audio and video rates.

This can be selected by setting 0x0A[7] to 0, and the results can

be read from 0x04 to 0x06. Manual mode is good for coherent

audio and video, where the audio and video clock are generated

from the same crystal; thus CTS should be a fixed number. The

auto mode is appropriate for incoherent audio-video, where

there is no simple integer ratio between the audio and video

clock. A filter is available (0x0A[6:5]) to stabilize the chip

generated CTS. The 20-bit N value can be programmed into the

AD9389 in Register 0x01 to Register 0x03.

PACKET CONFIGURATION

The AD9389 supports all the packets listed in the HDMI 1.1

specification. Each packet can be separately enabled and dis-

abled. Based on the audio and video input, the packets are

added to the HDMI link at the earliest time, so that a minimum

delay is incurred. Notice the ISRC1 packet has one bit to enable

the ISRC2 packet. For the general control packet, remember to

clear or reset the bits to avoid system lock-up.

PIXEL REPETITION

Due to HDMI specification and bandwidth requirements,

sometimes it is necessary to set clock multiplication by 2× and

4× in order to maintain the minimum TMDS clock frequency.

The AD9389 offers three choices for the user to implement this

function: auto mode, manual mode, and max mode (0x3B[6:5]).

For the auto mode (0x3B[6:5] = 00), based on the input video

format (either programmed by user, or chip detection) and

audio sampling rate, the AD9389 automatically sets the pixel

repetition factor (0x3D[7:6]).

For manual mode (0x3B[6:5] = 1×), the user programs the pixel

repetition factor in 0x3B[4:3].

For max mode (0x3B[6:5] = 01), based on the input video

format, the AD9389 selects the maximum repetition factor. The

advantage of the max mode is that it is independent of the audio

sampling rate.

Table 21. Pixel Repetition—Valid Pixel Repeat Values for Each Format

Video Code

Video Description

EIA/CEA-861B Pixel Repeat Values

HDMI Pixel Repeat Values

640 × 480p @ 60 Hz

No repetition

2, 3

720 × 480p @ 59.94/60 Hz

No repetition

1280 × 720p @ 59.94/60 Hz

No repetition

1920 × 1080i @ 59.94/60 Hz

No repetition

6, 7

720/1440 × 480i @ 59.94/60 Hz

Pixel sent 2 times

8, 9

720/1440 × 240p @ 59.94/60 Hz

Pixel sent 2 times

10, 11

2880 × 480i @ 59.94/60 Hz

Pixel sent 0 to 10 times

Pixel sent 1 to 10 times

12, 13

2880 × 240p @ 59.94/60 Hz

Pixel sent 1 to 10 times

14, 15

1440 × 480p @ 59.94/60 Hz

No repetition

Pixel sent 1 to 2 times1

1920 × 1080p @ 59.94/60 Hz

No repetition

17, 18

720 × 576p @ 50 Hz

No repetition

1280 × 720p @ 50 Hz

No repetition

1920 × 1080i @ 50 Hz

No repetition

21, 22

720/1440 × 576i @ 50 Hz

Pixel sent 2 times

23, 24

720/1440 × 288p @ 50 Hz

Pixel sent 2 times

25, 26

2880 × 576i @ 50 Hz

Pixel sent 1 to 10 times

27, 28

2880 × 288 @ 50 Hz

Pixel sent 1 to 10 times

29, 30

1440 × 576p @ 50 Hz

No repetition

Pixel sent 1 to 2 times1

1920 × 1080p @ 50 Hz

No repetition

1920 × 1080p @ 23.97/24 Hz

No repetition

1920 × 1080p @ 25 Hz

No repetition

1920 × 1080p @ 29.9/30 Hz

No repetition

1 Denotes change from EIA/CEA-861B valid values. Pixel repetition is required to support some audio formats at 720 × 480p and 720 × 576p video format timings.

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