LSH33 datasheet, PDF - EEWORLD Datasheet

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LSH33: Description32-bit Barrel Shifter with Registers; File Size160KB，8 Pages; ManufacturerLOGIC Devices; Websitehttp://www.logicdevices.com/

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LSH33 Overview

32-bit Barrel Shifter with Registers

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LSH33

DEVICES INCORPORATED

32-bit Barrel Shifter with Registers

LSH33

DEVICES INCORPORATED

32-bit Barrel Shifter with Registers

DESCRIPTION

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. Any shift con-

figuration of the 32 inputs, including

circular (barrel) shifting, left shifts

with zero fill, and right shifts with

sign extension are possible. In addi-

tion, a built-in priority encoder is

provided to aid floating point normal-

ization.

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.

SHIFT ARRAY

The 32 inputs, which can be regis-

tered, to the LSH33 are applied to a

32-bit shift array. 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). Alterna-

tively, 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.

Essentially the LSH33 is configured as

a left shift device. That is, a shift code

of 00000

results in no shift of the

input field. A code of 00001

provides

an effective left shift of 1 position, etc.

When viewed as a right shift, the shift

code corresponds to the two’s comple-

ment of the shift distance, i.e., a shift

code of 11111

(–1

) results in a right

shift of one position, etc.

When not in the wrap mode, the

LSH33 fills bit positions for which

there is no corresponding input bit.

The fill value and the positions filled

depend on the RIGHT/LEFT (R/L)

direction pin. This pin is a don’t care

input when in wrap mode. For left

shifts in fill mode, lower bits are filled

with zero as shown in Table 2. For

right shifts, however, the SIGN input

is used as the fill value. Table 3

depicts the bits to be filled as a

function of shift code for the right shift

case. Note that the R/L input changes

only the fill convention, and does not

affect the definition of the shift code.

FEATURES

32-bit Input, 32-bit Output Multi-

plexed to 16 Lines

Full 0-31 Position Barrel Shift

Capability

Integral Priority Encoder for 32-bit

Floating Point Normalization

Sign-Magnitude or Two’s Comple-

ment Mantissa Representation

32-bit Linear Shifts with Sign or

Zero Fill

Independent Priority Encoder

Outputs for Block Floating Point

68-pin PLCC, J-Lead

LSH33 B

LOCK

IAGRAM

SIGN

-I

CLK

ENI

2:1

FTI

32:5

PRIORITY

ENCODE

2:1

RIGHT/LEFT

FILL/WRAP

32-bit

BARREL

SHIFT

ARRAY

CLK

ENO

FTO

2:1

NORM

2:1

SI/O

-SI/O

MS/LS

-Y

Special Arithmetic Functions

08/16/2000–LDS.33-O

LSH33 Related Products

	LSH33	LSH33JC30
Description	32-bit Barrel Shifter with Registers	32-bit Barrel Shifter with Registers

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