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LSH32JC32 Datasheet(PDF) 4 Page - LOGIC Devices Incorporated |
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LSH32JC32 Datasheet(HTML) 4 Page - LOGIC Devices Incorporated |
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4 / 9 page  DEVICES INCORPORATED LSH32 32-bit Cascadable Barrel Shifter Special Arithmetic Functions 08/16/2000–LDS.32-Q ffs4 LONG-WORD NORMALIZATION (MULTIPLE CYCLES) Normalization of floating point mantissas longer than 32 bits can be accomplished by cascading LSH32 units. When cascading for normaliza- tion, the device inputs are overlapped such that each device lower in priority than the first shares 16 inputs with its more significant neighbor. Fill mode and left shift are selected, however, internal normalization (NORM) is not used. The most significant result half of each device is enabled to the output. The shift out (SO4–SO0) lines of the most significant slice are connected to the shift in lines of all clock normalization requiring shifts longer than 16 bits can be accom- plished by a bank-select technique described below. SINGLE CYCLE LONG-WORD NORMALIZATION An extension of the above concept is a single clock normalization of long words (potentially requiring shifts of more than 15 places). The arrange- ment of LSH32s required is shown in Figure 1. Cascading of LSH32 units is accomplished by connecting the SI3– SI0 input lines of each unit to the SO3 – SO0 outputs of the most significant device in the row as before. Essen- slices, including the first. The excep- tion is that all SI4 lines are grounded, limiting the shift distance to 16 positions. The shift distance required for normalization is produced by the priority encoder in the most signifi- cant slice. The priority encoder will produce the shift code necessary to normalize the input word if the leading non-zero digit is found in the upper 16 bits. If this is the case, the number of shift positions necessary to accomplish normalization is placed on the SO4 –SO0 outputs for use by all slices, and the appropriate 0–15 bit shift is accomplished. If the upper 16 bits are all zero, then the maximum shift of 15 places is executed. Single FIGURE 1. SINGLE CYCLE LONG-WORD NORMALIZATION USING LSH32S LSH32 SI3-0 5 SO4-0 OE 4 LSH32 5 OE 4 LSH32 5 OE 4 LSH32 5 OE 4 SI4 LSH32 OE 4 LSH32 OE 4 LSH32 OE 4 LSH32 OE 4 LSH32 OE 4 LSH32 OE 4 SI4 SI4 I63-I48 Y63-Y48 MSBs PRIORITY ENCODE 2:4 DECODE I47-I32 I31-I16 I15-I0 0 I47-I32 I31-I16 I15-I0 0 I31-I16 I15-I0 0 I16-I0 0 SI3-0 SI3-0 SI3-0 SO4-0 SI3-0 SI3-0 SI3-0 SI3-0 SO4-0 SI3-0 SI4 SI3-0 SO4-0 Y47-Y32 Y31-Y16 Y15-Y0 |
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