L64105 LSI Logic Corporation, L64105 Datasheet - Page 353

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

10.6.1 Number of IEC958 Frames when Formatting MPEG Data
10.6.2 Pd Field
The size of the IEC958 data burst differs according to the type of the
incoming MPEG bitstream being fed to the MPEG Formatter. This is
explained in detail in
Table 10.5
1. One IEC958 frame contains a left and right sample and is 16 x 2 = 32 bits long.
As previously explained, the burst is headed with a burst preamble,
followed by the burst payload, and stuffed with stuffing bits until it
contains the number of IEC958 frames required for the data type being
formatted.
The IEC958 specification dictates that the Pd field contain the length of
the burst payload in bits (length code) from 0 to 65535 as shown in
Figure
length code.
Figure 10.8 Length of Burst Payload
MPEG Formatter
Data Type
MPEG-1 Layer I data
MPEG-1 Layer II data or MPEG-2 data without extension
MPEG-2 data with extension
MPEG-2 Layer I low sample rate
MPEG-2 Layer II low sample rate
Pa
10.8. The size of the preamble is not counted in the value of the
Pb
Pc
IEC958 Frame Sizes Supported in MPEG Audio
Formatter
Pd
Table
10.5.
length of burst payload Pd
burst payload
IEC958 Frames
Number of
1152
1152
1152
384
384
10-21
1