msm7708-02 Oki Semiconductor, msm7708-02 Datasheet - Page 32

• Manufacturer Part Number: msm7708-02
• Description: Serial Register Interface Adpcm Codec For Telephone Recording
• Manufacturer: Oki Semiconductor

¡ Semiconductor
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 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.
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.
* 0000h to 001Fh is used as the channel index area.
Total Memory Capacity
Number of words
000h
020h
01Fh
3FFh
(device name)
X address*
CR5-B5

X address (1 K words of 000h to 3FFh : 1 word = 1 Kb)
Figure 7 Address Space of the 1 Mb Serial Register
channel index area (32 words ¥ 1 Kb + 32 Kb)
ADPCM (voice) data area
(MSM63V89C)
000h to 3FFh
1K words
1 Mb
0
4 bit
00h
4 bit
01h
0000h to 0FFFh
(MSM6684)
4K words
1 Kb in Y direction
4 Mb
Y address
1
1 word = 1 Kb
0000h to 1FFFh
(MSM6685)
4 bit
FEh
8K words
8 Mb
1
MSM7708-02
4 bit
FFh
32/38