HSP50216 데이터 시트보기 (PDF) - Intersil
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HSP50216 Datasheet PDF : 58 Pages
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HSP50216
The parallel input busses are 16 bits wide. The input format
may be twos complement or offset binary format. A floating
point mode is also supported. The floating point modes and
the mapping of the parallel 16-bit input format is discussed
below.
Floating Point Input Mode Bit Mapping
The input bit weighting for fixed point inputs on busses A, B,
C, and D is:
bit 15 (MSB): 20, bit 14: 2-1, bit 13: 2-2, ..., bit 0: 2-15.
For floating point modes, the least significant 2 or 3 bits are
used as exponent bits (See Floating Point Input Mode Bit
Mapping Tables). The difference between the four floating
point modes with three exponent bits is where the exponent
saturates.
Floating Point Input Mode Bit Mapping Tables
A(15:0), B(15:0), C(15:0) or D(15:0):
15 14
13 12 11 10 9
8
7
6
5
4
3
20 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12
2
2-13/(exp2)
1
(exp1)
0
(exp0)
11-BIT MODE: 11 to 13-BIT MANTISSA, 3-BIT EXPONENT, 30dB EXPONENT RANGE
EXPONENT GAIN (dB)
PIN BIT WEIGHTING TO 16-BIT INPUT MAPPING
000
0
X15 X15 X15 X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5
001
6
X15 X15 X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4
010
12
X15 X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3
011
18
X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0
100
24
X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0
0
101 (Note 1) 30
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
NOTES:
1. Or 110 or 111, the exponent input saturates at 10.
2. “Xnn” = input A, B, C, or D bit nn.
12-BIT MODE: 12 to 13-BIT MANTISSA, 3-BIT EXPONENT, 24dB EXPONENT RANGE
EXPONENT GAIN (dB)
PIN BIT WEIGHTING TO 16-BIT INPUT MAPPING
000
0
X15 X15 X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4
001
6
X15 X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3
010
12
X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0
011
18
X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0
100 (Note 3)
24
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
NOTE:
3. Or 101, 110, or 111, the exponent input saturates at 100.
13-BIT MODE: 13-BIT MANTISSA, 3-BIT EXPONENT, 18dB EXPONENT RANGE
EXPONENT
GAIN (dB)
PIN BIT WEIGHTING TO 16-BIT INPUT MAPPING
000
0
X15 X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3
001
6
X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0
010
12
X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0
011 (Note 4)
18
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
NOTE:
4. Or 100, 101, 110, or 111, the exponent input saturates at 011.
8
FN4557.6
August 17, 2007
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