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HSP50216KIZ Datasheet(PDF) 8 Page - Intersil Corporation |
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HSP50216KIZ Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 58 page 8 FN4557.6 August 17, 2007 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 9876 5 4 3 2 1 0 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 2-13/(exp2) (exp1) (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 X9X8X7X6X5X4 010 12 X15 X15 X15 X15 X14 X13 X12 X11 X10 X9X8X7X6X5X4X3 011 18 X15 X15 X15 X14 X13 X12 X11 X10 X9X8X7X6X5X4X3 0 100 24 X15 X15 X14 X13 X12 X11 X10 X9X8X7X6X5X4X3 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 X8X7X6X5X4X3 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. HSP50216 |
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