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LSH32 数据表(PDF) 3 Page - LOGIC Devices Incorporated |
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LSH32 数据表(HTML) 3 Page - LOGIC Devices Incorporated |
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3 / 9 page  DEVICES INCORPORATED LSH32 32-bit Cascadable Barrel Shifter Special Arithmetic Functions 08/16/2000–LDS.32-Q 3 NORMALIZE MULTIPLXER The NORM input, when asserted results in the priority encoder output driving the internal shift code inputs directly. It is exactly equivalent to routing the SO4–SO0 outputs back to the SI4–SI0 inputs. The NORM input provides faster normalization of 32-bit data by avoiding the delay associated with routing the shift code off chip. When using the NORM function, the LSH32 should be placed in fill mode, with the R/L input low. APPLICATIONS EXAMPLES Normalization of mantissas up to 32 bits can be accomplished directly by a single LSH32. The NORM input is asserted, and fill mode and left shift are selected. The normalized mantissa is then available at the device output in two 16-bit segments, under the control of the output data multiplexer select, the MS/LS. If it is desirable to avoid the necessity of multiplexing output data in 16-bit segments, two LSH32 devices can be used in parallel. Both devices receive the same input word, with the MS/LS select line of one wired high, and the other low. Each device will then independently determine the shift distance required for normalization, and the full 32 bits of output data will be available simultaneously. TABLE 3. FILL MODE SHIFT CODE DEFINITIONS — RIGHT SHIFT TABLE 4. PRIORITY ENCODER FUNCTION TABLE I I I I I31 31 31 31 31 I I I I I30 30 30 30 30 I I I I I29 29 29 29 29 ••• ••• ••• ••• ••• I I I I I16 16 16 16 16 I I I I I15 15 15 15 15 ••• ••• ••• ••• ••• I I I I I2 2 2 2 2 I I I I I1 1 1 1 1 I I I I I0 0 0 0 0 Shift Code Shift Code Shift Code Shift Code Shift Code 1X X ••• XX ••• X X X 00000 01 X ••• XX ••• X X X 00001 001 ••• XX ••• X X X 00010 ••• •••• • ••• ••• • ••• •••• • ••• ••• • 000 ••• 1X ••• X X X 01111 000 ••• 01 ••• X X X 10000 000 ••• 00 ••• X X X 10001 ••• •••• • ••• ••• • ••• •••• • ••• ••• • 000 ••• 00 ••• 0 1 X 11110 000 ••• 00 ••• 0 0 1 11111 000 ••• 00 ••• 0 0 0 11111 Shift Code Shift Code Shift Code Shift Code Shift Code Y Y Y Y Y 31 31 31 31 31 Y Y Y Y Y 30 30 30 30 30 Y Y Y Y Y 29 29 29 29 29 ••• ••• ••• ••• ••• Y Y Y Y Y 16 16 16 16 16 Y Y Y Y Y 15 15 15 15 15 ••• Y Y Y Y Y2 2 2 2 2 Y Y Y Y Y1 1 1 1 1 Y Y Y Y Y0 0 0 0 0 00000 S S S ••• SS ••• SSS 00001 S S S ••• SS ••• SS I31 00010 S S S ••• SS ••• SI31 I30 00011 S S S ••• SS ••• I31 I30 I29 • ••• •••• • ••• ••• • ••• •••• • ••• ••• • ••• •••• • ••• ••• 01111 S S S ••• SS ••• I19 I18 I17 10000 S S S ••• SI31 ••• I18 I17 I16 10001 S S S ••• I31 I30 ••• I17 I16 I15 10010 S S S ••• I30 I29 ••• I16 I15 I14 • ••• •••• • ••• ••• • ••• •••• • ••• ••• • ••• •••• • ••• ••• 11100 S S S ••• I20 I19 ••• I6 I5 I4 11101 S S S ••• I19 I18 ••• I5 I4 I3 11110 S S I31 ••• I18 I17 ••• I4 I3 I2 11111 S I31 I30 ••• I17 I16 ••• I3 I2 I1 |
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