AT94K05AL-25DQU Atmel, AT94K05AL-25DQU Datasheet - Page 116
AT94K05AL-25DQU
Manufacturer Part Number
AT94K05AL-25DQU
Description
Manufacturer
Atmel
Datasheet
1.AT94K05AL-25DQU.pdf
(204 pages)
Specifications of AT94K05AL-25DQU
Device System Gates
5000
Propagation Delay Time
12.1ns
Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (max)
3.6V
Operating Supply Voltage (min)
3V
Operating Temperature Classification
Industrial
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Mounting
Surface Mount
Pin Count
208
Package Type
PQFP
Lead Free Status / RoHS Status
Compliant
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4.28.3
116
AT94KAL Series FPSLIC
16-bit x 16-bit = 16-bit Operation
This operation is valid for both unsigned and signed numbers, even though only the unsigned
multiply instruction (MUL) is needed, see
When A and B are positive numbers, or at least one of them is zero, the algorithm is clearly cor-
rect, provided that the product C = A • B is less than 2
unsigned number, or less than 2
When both factors are negative, the two’s complement notation is used:
A = 2
C = A • B = (2
Here we are only concerned with the 16 LSBs; the last part of this sum will be discarded and we
will get the (correct) result C = |A • B|.
Figure 4-38. 16-bit Multiplication, 16-bit Result
When one factor is negative and one factor is positive, for example, A is negative and B is
positive:
C = A • B = (2
The MSBs will be discarded and the correct two’s complement notation result will be
C = 2
The product must be in the range 0 ≤ C ≤ 2
2
When doing integer multiplication in C language, this is how it is done. The algorithm can be
expanded to do 32-bit multiplication with 32-bit result.
15
≤ C ≤ 2
16
16
- |A| and B = 2
- |A • B|.
15
- 1 if signed numbers are used.
16
16
- |A|) • (2
- |A|) • |B| = (2
16
- |B|:
16
- |B|) = |A • B| + 2
AH AL
+
+
=
16
15
• |B|) - |A • B| = (2
if the product is to be used as a signed number.
16
Figure
AL * BH
AH * BL
X
- 1 if unsigned numbers are used, and in the range -
32
- 2
4-38. A mathematical explanation is given:
CH
BH BL
AL * BL
16
16
• (|A| + |B|)
- |A • B|) + 2
CL
16
if the product is to be used as an
16
• (|B| - 1)
1
2
3
1138I–FPSLI–1/08
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