Figure - 13 Coe-RAM " />
參數(shù)資料
型號(hào)： IDT821054PQFG
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 38/45頁
文件大?。?/td> 0K
描述： IC PCM CODEC QUAD MPI 64-PQFP
標(biāo)準(zhǔn)包裝： 84
類型： PCM 編解碼器/濾波器
數(shù)據(jù)接口： PCM 音頻接口
ADC / DAC 數(shù)量： 4 / 4
三角積分調(diào)變： 無
電壓 - 電源，模擬： 4.75 V ~ 5.25 V
電壓 - 電源，數(shù)字： 4.75 V ~ 5.25 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 64-QFP
供應(yīng)商設(shè)備封裝： 64-PQFP（14x14）
包裝： 管件
其它名稱： 800-2516-5
821054PQFG
IDT821054PQFG-ND
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
Block # Word # Address
Function
5
39
100,111
GRX RAM
3
19
010,011
GIS RAM
38
100,110
FRR RAM
18
010,010
37
100,101
17
010,001
36
100,100
16
010,000
35
100,011
2
15
001,111
ECF RAM
34
100,010
14
001,110
33
100,001
13
001,101
32
100,000
12
001,100
4
31
011,111
GTX RAM
11
001,011
30
011,110
FRX RAM
10
001,010
29
011,101
9
001,001
28
011,100
8
001,000
27
011,011
1
7
000,111
IMF RAM
26
011,010
6
000,110
25
011,001
5
000,101
24
011,000
4
000,100
3
23
010,111
Amplitude Coefficient of Tone Generator 1
3
000,011
22
010,110
Frequency Coefficient of Tone Generator 1
2
000,010
21
010,101
Amplitude Coefficient of Tone Generator 0
1
000,001
20
010,100
Frequency Coefficient of Tone Generator 0
0
000,000
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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