參數(shù)資料
型號： IDT821054PQF
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 編解碼器
英文描述： QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE
中文描述： A/MU-LAW, PCM CODEC, PQFP64
封裝： PLASTIC, QFP-64
文件頁數(shù)： 43/45頁
文件大小： 506K
代理商： IDT821054PQF
43
IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE
9
APPENDIX: IDT821054 COE-RAM MAPPING
Figure - 13 Coe-RAM Mapping
Generally, 6 bits of address are needed to locate each word of the 40 Coe-RAM words. In the IDT821054, the 40 words of Coe-RAM are divided
into 5 blocks with 8 words per block, so, only 3 address bits are needed to locate each of the block. When the address of a Coe-RAM block (b[2:0]) is
specified in a Coe-RAM command, all 8 words of this block will be addressed automatically, with the highest order word first (The IDT821054 will count
down from '111' to '000' so that it accesses the 8 words successively). Refer to
“3.1.4 Addressing the Coe-RAM”
for details.
The address assignment for the 40 words of Coe-RAM is as shown in
Table - 5
. The number in the “Address” column is the actual address of each
Coe-RAM word. As the IDT821054 handles the lower 3 bits of address automatically, only the higher 3 bits of address (in bold style) are needed for a
Coe-RAM Command. It should be noted that, when addressing the GRX RAM, the FRR RAM will be addressed at the same time.
Table - 5 Coe-RAM Address Allocation
Block # Word #
Address
Function
39
100
,111
GRX RAM
38
100
,110
37
100
,101
36
100
,100
35
100
,011
34
100
,010
33
100
,001
32
100
,000
31
011
,111
GTX RAM
30
011
,110
29
011
,101
28
011
,100
27
011
,011
26
011
,010
25
011
,001
24
011
,000
23
010
,111
Amplitude Coefficient of Tone Generator 1
22
010
,110
Frequency Coefficient of Tone Generator 1
21
010
,101
Amplitude Coefficient of Tone Generator 0
20
010
,100
Frequency Coefficient of Tone Generator 0
Block # Word #
Address
010
,011
010
,010
010
,001
010
,000
001
,111
001
,110
001
,101
001
,100
001
,011
001
,010
001
,001
001
,000
000
,111
000
,110
000
,101
000
,100
000
,011
000
,010
000
,001
000
,000
Function
5
3
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
GIS RAM
FRR RAM
2
ECF RAM
4
FRX RAM
1
IMF RAM
3
b[2:0] of a Coe-RAM
Command
Word #
000
001
010
011
100
7
0
15
8
23
16
31
24
39
32
Block #
5
4
3
2
1
GTX RAM
FRX RAM
ECF RAM
IMF RAM
TONE RAM
GIS RAM
GRX RAM
FRR RAM
Channel2
Channel3
Channel4
Channel1
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