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參數(shù)資料
| 型號(hào)： | DSP1628 |
| 英文描述： | TVS 400W 60V BIDIRECT SMA |
| 中文描述： | 澄清，串行I /設(shè)備的DSP1620/27/28/29 O控制注冊(cè)說(shuō)明 |
| 文件頁(yè)數(shù)： | 54/114頁(yè) |
| 文件大?。?/td> | 804K |
| 代理商： | DSP1628 |
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Preliminary Data Sheet
February 1997
DSP1628 Digital Signal Processor
52
Lucent Technologies Inc.
5 Software Architecture
(continued)
I
Barrel Shifter
aD = aS >> IM16
aD = aS >> arM
aD = aS >> aS
Arithmetic right shift by immediate (36-bit, sign filled in); 2-cycle, 2-word.
Arithmetic right shift by
arM
(36-bit, sign filled in); 1-cycle.
Arithmetic right shift by aS (36-bit, sign filled in); 2-cycle.
aD = aS >>> IM16
aD = aS >>> arM
aD = aS >>> aS
Logical right shift by immediate (32-bit shift, 0s filled in); 2-cycle, 2-word.
Logical right shift by
arM
(32-bit shift, 0s filled in); 1-cycle.
Logical right shift by aS (32-bit shift, 0s filled in); 2-cycle.
aD = aS << IM16
aD = aS << arM
aD = aS << aS
Arithmetic left shift
by immediate (36-bit shift, 0s filled in); 2-cycle, 2-word.
Arithmetic left shift
by
arM
(36-bit shift, 0s filled in); 1-cycle.
Arithmetic left shift
by aS (36-bit shift, 0s filled in); 2-cycle.
aD = aS <<< IM16
aD = aS <<< arM
aD = aS <<< aS
Not the same as the special function arithmetic left shift. Here, the guard bits in the destination accumulator are shifted into, not sign-extended.
Logical left shift by immediate (36-bit shift, 0s filled in); 2-cycle, 2-word.
Logical left shift by
arM
(36-bit shift, 0s filled in); 1-cycle.
Logical left shift by aS (36-bit shift, 0s filled in); 2-cycle.
I
Normalization and Exponent Computation
aD = exp(aS)
aD = norm(aS, arM)
Detect the number of redundant sign bits in accumulator; 1-cycle.
Normalize aS with respect to bit 31, with exponent in
arM
; 1-cycle.
I
Bit Field Extraction and Insertion
aD = extracts(aS, IM16) Extraction with sign extension, field specified as immediate; 2-cycle, 2-word.
aD = extracts(aS, arM) Extraction with sign extension, field specified in
arM
; 1-cycle.
aD = extractz(aS, IM16) Extraction with zero extension, field specified as immediate; 2-cycle, 2-word.
aD = extractz(aS, arM) Extraction with zero extension, field specified in
arM
; 1-cycle.
aD = insert(aS, IM16)
aD = insert(aS, arM)
Bit field insertion, field specified as immediate; 2-cycle, 2-word.
Bit field insertion, field specified in
arM
; 2-cycle.
Note
: The bit field to be inserted or extracted is specified as follows. The width (in bits) of the field is the upper
byte of the operand (immediate or
arM
), and the offset from the LSB is in the lower byte.
I
Alternate Accumulator Set
aD = aS:aa0
aD = aS:aa1
Shuffle accumulators with alternate accumulator 0 (
aa0
); 1-cycle.
Shuffle accumulators with alternate accumulator 1 (
aa1
); 1-cycle.
Note
:
The alternate accumulator gets what was in aS. aD gets what was in the alternate accumulator.
Table 23. Replacement Table for F3 ALU Instructions and F4 BMU Instructions
Replace
aD, aT, aS
IM16
arM
Value
a0 or a1
immediate
ar<0—3>
Meaning
One of the two accumulators.
16-bit data, sign-, zero-, or one-extended as appropriate.
One of the auxiliary BMU registers.
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