參數(shù)資料
型號(hào)： IDT821068PX
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類(lèi)： 編解碼器
英文描述： OCTAL PROGRAMMABLE PCM CODEC
中文描述： A/MU-LAW, PROGRAMMABLE CODEC, PQFP128
封裝： PLASTIC, QFP-128
文件頁(yè)數(shù)： 42/45頁(yè)
文件大?。?/td> 589K
代理商： IDT821068PX
INDUSTRIAL TEMPERATURE RANGE
IDT821068 OCTAL PROGRAMMABLE PCM CODEC
42
Generally, 6 bits of address are needed to locate each word of the 40 Coe-RAM words. The 40 words of Coe-RAM are divided into 5 blocks with
8 words per block in IDT821068, so only 3 bits of address 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 (IDT821068 will count
down from '111' to '000' so that it accesses the 8 words successively). Refer to “Addressing the Coe-RAM” on Page 20 for more information.
The address assignment for the 40 words Coe-RAM is shown in the following table. The number in the “Address” column is the actual hexadecimal
address of the Coe-RAM word, as the IDT821068 handles the lower 3 bits automatically, only the higher 3 bits (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.
APPENDIX I: IDT821068 Coe-RAM Address Mapping
Km RAM
ACT RAM
ACR RAM
GTX RAM
GTX RAM
GRX RAM
GRX RAM
Km RAM
ACT RAM
ACR RAM
Km RAM
ACT RAM
ACR RAM
GTX RAM
GRX RAM
Km RAM
ACT RAM
ACR RAM
GTX RAM
GRX RAM
Km RAM
ACT RAM
ACR RAM
GTX RAM
GRX RAM
Km RAM
ACT RAM
ACR RAM
GTX RAM
GRX RAM
Km RAM
ACT RAM
ACR RAM
GIS RAM
FRR RAM
GRX RAM
GRX RAM
FRR RAM
GTX RAM
FRX RAM
ECF RAM
IMF RAM
channel1
channel2
channel3
channel4
channel5
channel6
channel8
channel7
000
001
010
011
100
Word#
b[2:0] Of a Coe-RAM
Command
0
7
8
15
16
23
24
31
32
39
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