LOGIC Devices Incorporated LSH33
The LSH33 is a 32-bit high speed shifter designed for use in floating point normalization, word pack/ unpack, field extraction, and similar applications. It has 32 data inputs, and 16 output lines. SHIFT ARRAY The 32 inputs, which can be registered, to the LSH33 are applied to a 32-bit shift array.
| Part No. |
LSH33 |
| Datasheet |
LSH33
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| Manufacturer |
 LOGIC Devices Incorporated |
| Description |
32-bit Barrel Shifter with Registers |
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DESCRIPTION
It has 32 data inputs, and 16 output lines. Any shift configuration of the 32 inputs, including circular (barrel) shifting, left shifts with zero fill, and right shifts with sign extension are possible. In addition, a built-in priority encoder is provided to aid floating point normalization. Input/Output registers provide complete pipelined operation. Both have independent bypass paths for complete flexibility. When FTI = 1, the input registers are bypassed. Likewise, when FTO= 1, the output registers are bypassed. The 32 outputs, which can also be registered, of this array are then multiplexed down to 16 lines for presentation at the device outputs. The array may be configured such that any contiguous 16-bit field (including wraparound of the 32 inputs) may be presented to the output pins under control of the shift code field (wrap mode). Alternatively, the wrap feature may be disabled, resulting in zero or sign bit fill, as appropriate (fill mode). The shift code control assignments and the resulting input to output mapping for the wrap mode are shown in Table 1.
