SNC710
16-bit Voice Engine
4.2 Memory Mapping
The SNC710 provides totally 24-bit address for mask ROM addressing. The whole
ROM area is divided into 8 pages, each page’s addressing ability is 32M bits (2M
words). The first ROM page is reserved for system. It built-in 32K words high speed
ROM internally for Voice decompressed algorithm. The actual addressing capability
free for user is 224M bits (14M words). The memory mapping of external mask ROM is
shown as bellow:
Reserved for System
0x0200000
32K words
(inside SNC710)
2M words
(32M bits)
0x0000000
0x0007FFF
0x0008000
14M words
(224M bits)
0x01FFFFF
Free for user
0x0FFFFFF
Table-1
4.3 System Clock
The system clock source also can be selected from 16MHZ Rosc. For the ROSC, user
should connect two resistors in the pin “XIN” and “XOUT” instead of 16MHZ crystal.
Beside, the clock source select pin “CKSEL” also should be connected to VDD for
ROSC.
In order to get an accurate system clock by ROSC, the real time clock
source is recommended to connect a 32768HZ crystal for system clock
calibration.
39
XIN
LXIN
43
LOUT 44
R2
110K
38
XOUT
Y1
75K
32768HZ
C1
C2
R1
Ver. 1.4
6
July 30, 2003
15pF
15pF
SONIX [ SONIX TECHNOLOGY COMPANY ]
