L64105 LSI Logic Corporation, L64105 Datasheet - Page 170

• Manufacturer Part Number: L64105
• Description: Mpeg-2 Audio/video Decoder
• Manufacturer: LSI Logic Corporation

Figure 4.130 Register 366 (0x16E)
4-88
Reserved
7
Formatter Skip Frame Size
6
IEC - Overwrite Copyright
Overwrite Category
Host Overwrite Quantization [1:0]
Register Descriptions
[1:0]
5
Formatter Only
When this bit is set, the value in bit 6 of this register is
used instead of the copyright value in the bitstream. The
default value of this bit is 0.
When this bit is set, the category code in the channel
status word of the S/P DIF frame is overridden by the
value written in Register 367
When this bit is cleared, the default category codes are
shown in the following table:
Data Format
PCM Sample
Digital Data
The host can specify the quantization value here and
override the value in the bitstream if the Overwrite
Quantization Enable bit (bit 3 in this register) is set. For
example, the host may want to force 16-bit quantization
even though the input bitstream has 20-bit resolution.
The audio decoder appropriately truncates or extends
PCM samples to achieve this. The following table shows
the encoding of the quantization values.
Bits [2:1]
0b00
0b01
0b10
0b11
MPEG
4
Quantization
Host Overwrite
Quantization
16 bit
20 bit
24 bit
Not used
Overwrite
Default Category
Code
0x00
0x98
3
Host Quantization [1:0]
2
(page
4-89) by the host.
1
R/W [2:1]
Overwrite
Category
R/W 7
R/W 0
0