LMU18
DEVICES INCORPORATED
16 x 16-bit Parallel Multiplier
FIGURE 1A. INPUT FORMATS
AIN
BIN
Fractional Two’s Complement (TCA, TCB = 1)
15 14 13
2
1
0
15 14 13
2
1
0
–20 2–1 2–2
2–13 2–14 2–15
–20 2–1 2–2
2–13 2–14 2–15
(Sign)
(Sign)
Integer Two’s Complement (TCA, TCB = 1)
15 14 13
2
1
0
15 14 13
2
1
0
–215 214 213
22 21 20
–215 214 213
22 21 20
(Sign)
(Sign)
Unsigned Fractional (TCA, TCB = 0)
15 14 13
2–1 2–2 2–3
2
1
0
15 14 13
2–1 2–2 2–3
2
1
0
2–14 2–15 2–16
2–14 2–15 2–16
Unsigned Integer (TCA, TCB = 0)
15 14 13
215 214 213
2
1
0
15 14 13
215 214 213
2
1
0
22 21 20
22 21 20
FIGURE 1B. OUTPUT FORMATS
MSP
LSP
Fractional Two’s Complement (RS = 0)
31 30 29
18 17 16
2–13 2–14 2–15
15 14 13
2
1
0
–20 2–1 2–2
–20 2–16 2–17
2–28 2–29 2–30
(Sign)
(Sign)
Fractional Two’s Complement (RS = 1)
31 30 29
18 17 16
2–12 2–13 2–14
15 14 13
2–15 2–16 2–17
2
1
0
–21 20 2–1
2–28 2–29 2–30
(Sign)
Integer Two’s Complement (RS = 1)
31 30 29
18 17 16
218 217 216
15 14 13
215 214 213
2
1
0
–231 230 229
22 21 20
(Sign)
Unsigned Fractional (RS = 1)
31 30 29
2–1 2–2 2–3
18 17 16
2–14 2–15 2–16
15 14 13
2–17 2–18 2–19
2
1
0
2–30 2–31 2–32
Unsigned Integer (RS = 1)
31 30 29
231 230 229
18 17 16
218 217 216
15 14 13
215 214 213
2
1
0
22 21 20
Multipliers
08/16/2000–LDS.18-O
2
LOGIC [ LOGIC DEVICES INCORPORATED ]
