PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 146

• Manufacturer Part Number: PSB7238
• Description: Joint Audio Decoder-Encoder - Multimode
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
Command Data Structure
0
1
2
3
4
5-7
8+
The header of the command data packet describes the JADE operation modes in effect
for data in the next packet. See Section Commands below for a detailed description of
the above command words.
The packet that is transferred from the JADE to the video processor - called “status data”
- consists of eight status words followed by the appropriate number of data words for the
current speech algorithm:
Status Data Structure
0
1
2
3
4
5
6-7
8+
The compressed data is between 0 and 160 words long depending on which of the
decoding/encoding modes is active (neutral, G.723, G.728, G.711, G.722, 8-kHz
samples pass-through or 16-kHz samples pass-through). Due to the different bit-rates of
the decoding/encoding modes for 16 Kbit/s, 48 Kbit/s and 56 Kbit/s only two, six or
seven bits of a byte are used. The most significant bits of the byte are valid and the least
significant bits are ignored. The first byte is the most significant byte of a word.
The G.723 compressed data framing is identical with the outband controlled mode, see
Section 6.2.1.2 for details.
Command header word
Checksum of words 2-7
Set mode
Set options
Set volume
Reserved for future expansion
Compressed data; 0, 4, 40, 80 or 160 words
Status header word
Capabilities
Mode status
Options status
Volume satus
Error conditions
Reserved for future expansion
Compressed data; 0, 4, 40, 80 or 160 words
146
Data Sheet 1998-07-01
Firmware Features
PSB 7238