AK2307 Просмотр технического описания (PDF) - Asahi Kasei Microdevices
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AK2307 Datasheet PDF : 39 Pages
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ASAHI KASEI
2. PCM Data Interface
[AK2307/LV]
AK2307/LV supports 4 PCM data interface modes.
- A/u-Law PCM data mode( Long or Short frame)
This mode is for interface of 64kbps PCM data which are compressed /extended by A -law or u-law. Both Long
frame
and short frame format data are acceptable. The PCM data occupies the first time slot of the PCM data bus which
is specified by the frame sync signal. Please refer to the format diagram.
- 16 bit Linear data Mode
This mode interfaces the 16 bit linear PCM data. PCM CODEC of AK2307/LV operates at 14 bit accuracy. The 2
bits
of the LSB are fixed in the 16 bit data stream.
- AK130 B1 Mode
This mode provides the PCM data Interface to AK130, the TCM transceiver for PBX/KTS system. PCM da ta format
is 64kbps A-law or u-law data. The timing between data and FS is different from the A/u -Law PCM data mode
written above. In this mode the PCM data are transmitted/received via B1 channel , one of the PCM data
channel of the AK130.
- AK130 B2 Mode
This mode provides the PCM data interface to AK130 B2 channel in as same manner as AK130 B1 Mode.
In every modes, the digital voice data are in and out from DR and DX pin and the bit clock and the 8KHz frame sync
signal will be fed via BCLK and FS, respectively. The order of PCM and linear data is MSB first .
Table 2-A Summary of PCM interface modes
Mode
PCM data
BCLK rate
format
A/u-Law PCM data
mode
A/u-Law
64K x N
(N: 1 to 32)
16bit Linear data
mode
16bit
Linear
128K x N
(N: 1 to 16)
AK130 B1
A/u-Law
2.048MHz
mode
AK130 B2
A/u-Law
2.048MHz
mode
frame
signal
LF/SF
auto select
SF
only
AK130 FS
signal
AK130 FS
signal
Time
slot
1st Time slot
first 16 bit after
FS signal
xxth time slot
of 2.048MHz(B1 channel)
xxth time slot
of 2.048MHz(B2 channel)
2-1. Selection of the interface mode
These four interface modes are selectable through the CPU register which specified below.
A/u-Law selection is also selectable from the same CPU register and it is effective in the u/ A-law interface mode and
AK130 B1/B2 modes.
Register Name; Path Control 2
ADD
D7
D6
1
-
RX
Pad
Default
0
0
Register Type : Read Write
D5
D4
D3
D2
Side
PCM_1 PCM_0
u/A
Tone
law
0
0
0
0
D1
SW10
0
D0
SW9
0
PCM_1、0 ； PCM interface mode select
PCM_1 PCM_0
Mode
0
0
A/u-Law PCM data mode
0
1
16bit Linear interface mode
1
0
AK130 B1 mode
1
1
AK130 B2 mode
u/A-law ; PCM compress/Extend format select
A/u-law
Compress/Extend
0
u-law
1
A-law
MS0190-E-05
10
2005/12
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