參數(shù)資料
型號: AK2305
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Dual PCM CODEC for ISDN TERMINAL ADAPTER
中文描述: 雙PCM編解碼器的ISDN終端適配器
文件頁數(shù): 10/43頁
文件大小: 481K
代理商: AK2305
ASAHI K ASEI [AK 2305]
C0029-E-02 10 1999/8
Long Frame Sync(LF) Short Frame Sync(SF)
AK2305 automatically decides whether Long Frame or Short Frame should be selected, by monitoring the high
level period of First FS.
Period of First FS =”H”
Frame type
more than 2 clock of BCLK
LF
1 clock of BCLK
SF
INTERFACE TIMING
<2ch Multiplex>
PCM data of both channel are interfaced by the DX0 and DR0(DX1 and DR1 are not used) at the format of
8bits in the period of 1 frame(125us) which synchronizes with the FSn(n=0,1). In the period of 1frame, 64 time
slots can be assigned at the maximum (in case of BCLK=4.096MHz). The number of the time slots is BCLK/64k.
The time slot assignment of CH0 and CH1 is decided by FS0 and FS1. In the mode of LF and SF, second FS(not
first FS) must be delayed or fast at least (8/BCLK) x n: (n=1 - 63) from the first FS.
LongFrame
1
2
3
4
FS0
7
8
DX0
DR0
5
6
BCLK
1
2
3
4
7
8
5
6
Don’t
care
Don’t care
ShortFrame
1
2
3
4
FS0
7
8
DX0
DR0
5
6
BCLK
1
2
3
4
7
8
5
6
Don’t
care
Don’t care
BCLK=4096kHz ( First FS = FS0 )
1
2
3
4
FS0
FS1
SLOT
63
64
1
DX0
DR0
2
3
ch0
output
ch1
output
ch0
input
ch1
input
ch0
output
ch1
output
ch0
input
ch1
input
4
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