isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 64

• Manufacturer Part Number: isd-t360sb
• Manufacturer: ETC-unknow

ISD-T360SB
The codecs should be connected as follows:
Telephone line or equivalent - always connected as channel 0.
Speaker and microphone - connected as channel 1 in case of one dual codec, connected as channel
2 in case of two single codecs.
Bit 23
Reserved.
Example
CMSG
Creates a new message with a message tag tag , and compression rate compression_rate allocates
num_of_blocks 4-Kbytes blocks for the new message, and sets the message pointer to the beginning of
the message data. CMSG switches the VoiceDSP processor to the MSG_OPEN state.
The memory space available for the message data is computed as follows:
Once a message is open (the processor is in the MSG_OPEN state), the message pointer can be set to
any position on a page (32 bytes) boundary within the message with the SMSG command. Modify the
message contents with the WMSG command, and read with the RMSG command.
The microcontroller must issue an S command to close the message and switch the VoiceDSP processor
to the IDLE state.
If the memory is full, EV_MEMFULL is set in the status word and no message is created. If the memory is
not full but there is insufficient memory and the processor cannot allocate more memory space,
EV_MEMLOW is set in the status word and no message is created.
The compression rate may be defined as 0 for PCM recording or either 1,2,3 for compression rates 4.7
Kbit/s, 6.7 Kbit/s, 8.7 Kbit/s respectively. See section “VCD” on page 2-10 for a description of the compres-
sion algorithm.
Example
2-28
CFG 188013
Byte sequence:
Description:
CMSG 0101 0001
Byte sequence:
Description:
(127 x num_of_blocks – 2) x 32 bytes.
Microcontroller
VoiceDSP
Configure the VoiceDSP to work with:
Microcontroller
VoiceDSP
Create a new message with a tag=0101, and allocate 1 block (4 Kbytes) for its data.
Create Message tag num_of_blocks compression_rate
Single codec in Slave Mode and A-Law compressed samples.
Data in Short Frame format and Single Bit Rate interface.
Two Serial Toshiba Flash devices.
Echo Cancellation for DTMF detection is On.
33
33
01
01
01
01
18
18
01
01
Voice Solutions in Silicon
80
80
00
00
2—SOFTWARE
13
13
01
01
™