參數(shù)資料
型號(hào)： MSM7584C
廠商： OKI SEMICONDUCTOR CO., LTD.
英文描述： π/4 Shift QPSK MODEM(π/4移動(dòng)QPSK調(diào)制解調(diào)器/ADPCM編碼譯碼器)
中文描述： π/ 4移位的QPSK調(diào)制解調(diào)器（π/ 4移動(dòng)的QPSK調(diào)制解調(diào)器/差分PcM編碼譯碼器）
文件頁(yè)數(shù)： 51/57頁(yè)
文件大?。?/td> 321K
代理商： MSM7584C
Semiconductor
MSM7584C
51/57
DATA CONFIGURATION IN THE EXTERNAL SERIAL REGISTER
X Address Space
The address space of the external serial register is accessed based on (word direction indicated
by the X address)
￥
(1 Kb depth in Y direction). The maximum X address in word direction
depends on the total memory capacity of serial registers connected. Since the leading 32 words
(32 Kb) of the serial register are used as the channel index area, X address 020h onward can be
used as the voice data area.
CR5-B5
0
1
1
Total Memory Capacity
(device name)
Number of words
X address*
1 Mb
(MSM6389)
1K words
000h to 3FFh
4 Mb
(MSM6684)
4K words
0000h to 0FFFh
8 Mb
(MSM6685)
8K words
0000h to 1FFFh
* 0000h to 001Fh are used as the channel index area.
Y Address Space
For 1 Kb ADPCM data in Y direction, 4 bits
￥
256 samples = 1024 bits are stored in the 1 Kb
memory area. One Y address is allocated to one sample (4 bits) of ADPCM data and addressing
is made with 00h to FFh.
000h
01Fh
020h
3FFh
X address (1 K words of 000h to 3FFh : 1 word = 1 Kb)
Channel index area (32 words
￥
1 Kb + 32 Kb)
ADPCM (voice) data area
1 Kb in Y direction
1 word = 1 Kb
00h
01h
FEh
FFh
Y address
4 bit
4 bit
4 bit
4 bit
1
Figure 16 Address Space of 1 Mb Serial Register
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