Datasheet

AD9880
Rev. 0 | Page 30 of 64
Hex
Address
Read/Write
or Read Only Bits
Default
Value Register Name
Description
0x50 Read/Write [7:0] 00100000 Test Must be written to 0x20 for proper operation.
0x56 Read/Write [7:0] 00001111 Test Must be written to default 0x0F for proper operation.
0x57 Read/Write [7] 0******* A/V Mute Override A1 overrides the AV mute value with Bit 6.
[6] *0****** AV Mute Value Sets AV mute value if override is enabled.
[3] ****0*** Disable Video Mute Disables mute of video during AV mute.
[2] *****0** Disable Audio Mute Disables mute of audio during AV mute.
0x58 Read/Write [7] MCLK PLL Enable MCLK PLL enable—uses analog PLL.
[6:4] MCLK PLL_N
MCLK PLL N [2:0]—this controls the division of the MCLK out of
the PLL: 0 = /1, 1 = /2, 2 = /3, 3 = /4, etc.
[3] N_CTS_Disable
Prevents the N/CTS packet on the link from writing to the N and
CTS registers.
[2:0] MCLK FS_N
Controls the multiple of 128 fs used for MCLK out . 0 = 128 fs,
1 = 256 fs, 2 = 384, 7 = 1024 fs.
0x59 Read/Write [6] MDA/MCL PU This disables the MDA/MCL pull-ups.
[5] CLK Term O/R Clock termination power-down override 0 = auto, 1 = manual.
[4] Manual CLK Term Clock termination: 0 = normal, 1 = disconnected.
[2] FIFO Reset UF This bit resets the audio FIFO if underflow is detected.
[1] FIFO Reset OF This bit resets the audio FIFO if overflow is detected.
[0]
MDA/MCL Three-
State
This bit three-states the MDA/MCL lines.
0x5A Read [6:0] Packet Detected
These 7 bits are updated if any specific packet has been received
since last reset or loss of clock detect. Normal is 0x00.
Bit Data Packet Detected
0 AVI infoframe.
1 Audio infoframe.
2 SPD infoframe.
3 MPEG source infoframe.
4 ACP packets.
5 ISRC1 packets.
6 ISRC2 packets.
0x5B Read [3] HDMI Mode 0 = DVI, 1 = HDMI.
0x5E Read [7:6] Channel Status Mode = 00. All others are reserved.
[5:3]
When Bit 1 = 0 (Linear PCM).
000 = 2 audio channels without pre-emphasis.
001 = 2 audio channels with 50/15 μs pre-emphasis.
010 = reserved.
011 = reserved.
2
0 = Software for which copyright is asserted.
1 = Software for which no copyright is asserted.
1
0 = audio sample word represents linear PCM samples.
1 = audio sample word used for other purposes.
0 0 = consumer use of channel status block.
Audio Channel Status
0x5F Read [7:0]
Channel Status
Category Code
0x60 Read [7:4] Channel Number
[3:0] Source Number
0x61 Read [5:4] Clock Accuracy Clock accuracy.
00 = Level II.
01 = Level III.
10 = Level I.
11 = reserved.
[3:0] Sampling 0011 = 32 kHz.