AT94K05AL-25BQX Atmel, AT94K05AL-25BQX Datasheet - Page 118
AT94K05AL-25BQX
Manufacturer Part Number
AT94K05AL-25BQX
Description
Manufacturer
Atmel
Datasheet
1.AT94K05AL-25BQX.pdf
(204 pages)
Specifications of AT94K05AL-25BQX
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
Commercial
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Mounting
Surface Mount
Pin Count
144
Package Type
LQFP
Lead Free Status / RoHS Status
Compliant
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4.28.5
4.28.6
118
AT94KAL Series FPSLIC
16-bit Multiply-accumulate Operation
Using Fractional Numbers
Figure 4-40. 16-bit Multiplication, 32-bit Accumulated Result
Unsigned 8-bit fractional numbers use a format where numbers in the range [0, 2> are allowed.
Bits 6 - 0 represent the fraction and bit 7 represents the integer part (0 or 1), i.e. a 1.7 format.
The FMUL instruction performs the same operation as the MUL instruction, except that the result
is left-shifted 1 bit so that the high byte of the 2-byte result will have the same 1.7 format as the
operands (instead of a 2.6 format). Note that if the product is equal to or higher than 2, the result
will not be correct.
To fully understand the format of the fractional numbers, a comparison with the integer number
format is useful: Table 20 illustrates the two 8-bit unsigned numbers formats. Signed fractional
numbers, like signed integers, use the familiar two’s complement format. Numbers in the range
[-1, 1> may be represented using this format.
If the byte “1011 0010” is interpreted as an unsigned integer, it will be interpreted as 128 + 32 +
16 + 2 = 178. On the other hand, if it is interpreted as an unsigned fractional number, it will be
interpreted as 1 + 0.25 + 0.125 + 0.015625 = 1.390625. If the byte is assumed to be a signed
number, it will be interpreted as 178 - 256 = -122 (integer) or as 1.390625 - 2 = -0.609375 (frac-
tional number).
AH AL
+
+
+
+
=
(sign
(sign
CH
CH
AH * BH
ext)
ext)
(sign ext)
CMH
CMH
AL * BH
AH * BL
X
BH BL
CML
CML
AL * BL
CL
CL
( New )
( Old )
1138I–FPSLI–1/08
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