LSH32 datasheet(1/9 Pages) LODEV

部件名	LSH32

功能描述	32-bit Cascadable Barrel Shifter

PDF	9 Pages

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制造商	LODEV [LOGIC Devices Incorporated]

网页	http://www.logicdevices.com

标志

1 / 9 page

DEVICES INCORPORATED

LSH32

32-bit Cascadable Barrel Shifter

Special Arithmetic Functions

08/16/2000–LDS.32-Q

1

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 LSH32 is configured as

a left shift device. That is, a shift code

of 000002 results in no shift of the

input field. A code of 000012 provides

an effective left shift of 1 position, etc.

When viewed as a right shift, the shift

code corresponds to the two’s com-

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

shift code of 111112 (–110) results in a

right shift of one position, etc.

When not in the wrap mode, the

LSH32 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.

In fill mode, as in wrap mode, the shift

code input represents the number of

shift positions directly for left shifts,

but the two’s complement of the shift

code results in the equivalent right

shift. However, for fill mode the R/L

input can be viewed as the most

u

u 32-bit Input, 32-bit Output Multi-

plexed to 16 Lines

u

u Full 0-31 Position Barrel Shift

Capability

u

u Integral Priority Encoder for 32-bit

Floating Point Normalization

u

u Sign-Magnitude or Two’s Comple-

ment Mantissa Representation

u

u 32-bit Linear Shifts with Sign or

Zero Fill

u

u Independent Priority Encoder

Outputs for Block Floating Point

u

u 68-pin PLCC, J-Lead

FEATURES

DESCRIPTION

LSH32

32-bit Cascadable Barrel Shifter

DEVICES INCORPORATED

The LSH32 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

configuration of the 32 inputs, includ-

ing circular (barrel) shifting, left shifts

with zero fill, and right shift with sign

extend are possible. In addition, a

built-in priority encoder is provided

to aid floating point normalization.

SHIFT ARRAY

The 32 inputs to the LSH32 are

applied to a 32-bit shift array. The 32

outputs of this array are multiplexed

down to 16 lines for presentation at

the device outputs. The array may be

LSH32 BLOCK DIAGRAM

16

OE

MS/LS

32-bit

BARREL

SHIFT

ARRAY

16

2:1

32:5

PRIORITY

ENCODE

32

5

32

SIGN I31-I0

NORM

RIGHT/LEFT

FILL/WRAP

5

Y15-Y0

SO4-SO0

SI4-SI0

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