TC9444F Datasheet, PDF (19/28 Pages) Toshiba Semiconductor – Single-Chip karaoke IC II

TC9444F
In addition Delay RAM is properly used by MAL [2:0] as RAM of 1024, 2048, and 4096 word, as
shown in the following figure.
FFFH
C00H
800H
400H
000H
1024 word
1024 word
1024 word
1024 word
D
F
C
G
B
E
A
Note 14: Since C block is assigned to Keycontrol R-ch, and D block is assingned to Keycontrol L-ch, it is neseccary
to be set to KEY = 0H when using it here.
Figure 3.1 Block Division of Delay RAM
Table 3.21 Block Assignment and Address Range of Delay RAM
MAL2
0
0
0
0
1
1
1
MAL1
0
0
1
1
0
0
1
MAL0
0
1
0
1
0
1
¾
Block
A
B
C
D
E
F
G
Address Range
3FFh to 000h
7FFh to 400h
BFFh to 800h
FFFh to C00h
7FFh to 000h
FFFh to C00h
FFFh to 000h
Table 3.22 Setting of Decimation Ratio
DECI2
0
0
0
0
DECI1
0
0
1
1
DECI0
0
1
0
1
Decimation Ratio
1/1
1/2
1/3
1/4
The same or overlapping block cannot be accessed by different decimation ratio.
Moreover, decimation ratio set up here and decimation ratio set up by DECI command need to be
fundamentally made in agreement.
DECI bit set up with an offset address determines decimation ratio of memory access, and a setup
to DECI command determines the band of a decimation filter.
19
2002-01-11