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參數(shù)資料
| 型號： | CDP1855CD |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 數(shù)字信號處理外設(shè) |
| 英文描述： | 8-Bit Programmable Multiply/Divide Unit |
| 中文描述： | 3-BIT, DSP-MULTIPLIER, CDIP28 |
| 文件頁數(shù)： | 7/15頁 |
| 文件大?。?/td> | 85K |
| 代理商： | CDP1855CD |
4-53
CONTROL REGISTER BIT ASSIGNMENT TABLE
BUS 7
BUS 6
BUS 5
BUS 4
BUS 3
BUS 2
BUS 1
BUS 0
B1
B0
OPERATION SELECT
REGISTER
RESET
0
0
No Operation
0
1
Multiply
1
0
Divide
1
1
Illegal State
B2 = 1, RESET Z REGISTER
B3 = 1, RESET Y REGISTER
B5
B4
NO. OF MDU’s
1
1
One MDU
1
0
Two MDU’s
0
1
Three MDU’s
0
0
Four MDU’s
NO. OF MDU’s
SHIFT RATE
1
Clock
÷
2
B6 = 1, RESET SEQUENCE COUNTER
2
Clock
÷
4
B7 = 1, SELECT SHIFT RATE OPTIONS:
B7 = 0, SHIFT = CLOCK FREQUENCY RATE
3
Clock
÷
8
4
Clock
÷
8
STATUS REGISTER
STATUS BYTE
BIT
7
6
5
4
3
2
1
0
OUTPUT
0
0
0
0
0
0
0
O.F.
NOTES:
1. O.F. = 1 if overflow (only valid after a divide has been done)
2. Bits 1 - 7 are read as 0 always.
DELAY NEEDED WITH AND WITHOUT PRESCALER
8N + 1 Shifts/Operation at 1 Clock Cycle/Shift
N = Number of MDU’s, S = Shift Rate
NO. OF MDU’s
WITHOUT PRESCALER
WITH PRESCALER
SHIFTS = 8N +1
NEEDED
(NOTE 1)
MACHINE CYCLES
NEEDED
SHIFTS = S (8N +1)
NEEDED
(NOTE 1)
MACHINE CYCLES
NEEDED
SHIFT RATE
1
9
2 (1 NOP)
18
3 (1 NOP)
2
2
17
2 (1 NOP)
68
9 (3 NOPs)
4
3
25
3 (1 NOP)
200
25 (9 NOPs)
8
4
33
4 (2 NOPs)
264
33 (11 NOPs)
8
NOTE:
1. NOP instruction is shown for machine cycles needed (3/NOP). Other instructions may be used.
CDP1855, CDP1855C
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CDP1855CDX | 8-Bit Programmable Multiply/Divide Unit |
| CDP1855CE | 8-Bit Programmable Multiply/Divide Unit |
| CDP1855CEX | 8-Bit Programmable Multiply/Divide Unit |
| CDP1855D | 8-Bit Programmable Multiply/Divide Unit |
| CDP1855E | 8-Bit Programmable Multiply/Divide Unit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CDP1855CDX | 制造商:Harris Corporation 功能描述: |
| CDP1855CE | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Bit Programmable Multiply/Divide Unit |
| CDP1855CEX | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Bit Programmable Multiply/Divide Unit |
| CDP1855D | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Bit Programmable Multiply/Divide Unit |
| CDP1855DX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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