LMA 1009/2009
DEVICES INCORPORATED
12 x 12-bit Multiplier-Accumulator
F
IGURE
1
A
.
I
NPUT
F
ORMATS
A
IN
B
IN
Fractional Two’s Complement (TC = 1)
11 10 9
–2
0
2
–1
2
–2
(Sign)
T
ABLE
1. P
RELOAD
T
RUTH
T
ABLE
PREL OEX
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
OEM
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
OEL
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
XTR
OUT
OUT
OUT
OUT
Z
Z
Z
Z
Z
Z
Z
Z
PREL
PREL
MSR LSR
OUT OUT
OUT
Z
Z
Z
OUT
Z
2 1 0
2
–9
2
–10
2
–11
11 10 9
–2
0
2
–1
2
–2
(Sign)
2 1 0
2
–9
2
–10
2
–11
OUT OUT
OUT
Z
Z
Z
Z
PREL
Z
OUT
Z
Z
PREL
Z
Integer Two’s Complement (TC = 1)
11 10 9
–2
11
2
10
2
9
(Sign)
2 1 0
2
2
2
1
2
0
11 10 9
–2
11
2
10
2
9
(Sign)
2 1 0
2
2
2
1
2
0
Unsigned Fractional (TC = 0)
11 10 9
2
–1
2
–2
2
–3
2 1 0
2
–10
2
–11
2
–12
11 10 9
2
–1
2
–2
2
–3
2 1 0
2
–10
2
–11
2
–12
PREL PREL
Z
Z
Z
PREL
Z
PREL PREL
PREL PREL PREL
Unsigned Integer (TC = 0)
11 10 9
2
11
2
10
2
9
2 1 0
2
2
2
1
2
0
11 10 9
2
11
2
10
2
9
2 1 0
2
2
2
1
2
0
PREL = Preload data to appropriate register
OUT = Register available on output pins
Z
= High impedance state
F
IGURE
1
B
.
O
UTPUT
F
ORMATS
XTR
MSR
Fractional Two’s Complement
26 25 24
–2
4
2
3
2
2
(Sign)
LSR
23 22 21
2
1
2
0
2
–1
14 13 12
2
–8
2
–9
2
–10
11 10 9
2
–11
2
–12
2
–13
2 1 0
2
–20
2
–21
2
–22
Integer Two’s Complement
26 25 24
–2
26
2
25
2
24
(Sign)
23 22 21
2
23
2
22
2
21
14 13 12
2
14
2
13
2
12
Unsigned Fractional
11 10 9
2
11
2
10
2
9
2 1 0
2
2
2
1
2
0
26 25 24
2
2
2
1
2
0
23 22 21
2
–1
2
–2
2
–3
14 13 12
2
–10
2
–11
2
–12
Unsigned Integer
11 10 9
2
–13
2
–14
2
–15
2 1 0
2
–22
2
–23
2
–24
26 25 24
2
26
2
25
2
24
23 22 21
2
23
2
22
2
21
14 13 12
2
14
2
13
2
12
11 10 9
2
11
2
10
2
9
2 1 0
2
2
2
1
2
0
Multiplier-Accumulators
2
03/29/2000–LDS.10/2009-L
LOGIC [ LOGIC DEVICES INCORPORATED ]
