Datasheet

AD9398
Rev. 0 | Page 32 of 44
0x87—Bit[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
0 AVI infoframe
1 Audio infoframe
2 SPD infoframe
3 MPEG source infoframe
4 ACP packets
5 ISRC1 packets
6 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 which 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 (Layers 1 and 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 2
010 3
011 4
100 5
101 6
110 7
111 8
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, it 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
FL Front left
FC Front center
FR Front right
FCL Front center left
FCR Front center right
RL Rear left
RC Rear center
RR Rear right
RCL Rear center left
RCR Rear center right
LFE Low frequency effect