LMA1010 Просмотр технического описания (PDF) - LOGIC Devices
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LMA1010 Datasheet PDF : 7 Pages
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DEVICES INCORPORATED
LMA1010/2010
16 x 16-bit Multiplier-Accumulator
TABLE 1. PRELOAD TRUTH TABLE
PREL OEX OEM OEL XTR MSR LSR
L
L
L
L OUT OUT OUT
L
L
L
H OUT OUT Z
L
L
H
L OUT Z OUT
L
L
H
H OUT Z Z
LH
L
L
Z OUT OUT
L
H
L
H
Z OUT Z
L
H
H
L
Z
Z OUT
L
H
H
H
Z
ZZ
HL
L
L
Z ZZ
HL
L
H Z Z PREL
H
L
H
L
Z PREL Z
H
L
H
H
Z PREL PREL
HH
L
L PREL Z Z
HH
L
H PREL Z PREL
HH
H
L PREL PREL Z
H
H
H
H PREL PREL PREL
PREL = Preload data to appropriate register
OUT = Register available on output pins
Z = High impedance state
FIGURE 1A. INPUT FORMATS
AIN
BIN
Fractional Two’s Complement (TC = 1)
15 14 13
–20 2–1 2–2
(Sign)
210
2–13 2–14 2–15
15 14 13
–20 2–1 2–2
(Sign)
210
2–13 2–14 2–15
Integer Two’s Complement (TC = 1)
15 14 13
–215 214 213
(Sign)
210
22 21 20
15 14 13
–215 214 213
(Sign)
210
22 21 20
15 14 13
2–1 2–2 2–3
Unsigned Fractional (TC = 0)
210
2–14 2–15 2–16
15 14 13
2–1 2–2 2–3
210
2–14 2–15 2–16
15 14 13
215 214 213
Unsigned Integer (TC = 0)
210
22 21 20
15 14 13
215 214 213
210
22 21 20
FIGURE 1B. OUTPUT FORMATS
XTR
34 33 32
–24 23 22
(Sign)
34 33 32
–234 233 232
(Sign)
34 33 32
22 21 20
MSR
LSR
Fractional Two’s Complement
31 30 29
21 20 2–1
18 17 16
2–12 2–13 2–14
15 14 13
2–15 2–16 2–17
210
2–28 2–29 2–30
Integer Two’s Complement
31 30 29
231 230 229
18 17 16
218 217 216
15 14 13
215 214 213
210
22 21 20
Unsigned Fractional
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
210
2–30 2–31 2–32
34 33 32
234 233 232
Unsigned Integer
31 30 29
231 230 229
18 17 16
218 217 216
15 14 13
215 214 213
210
22 21 20
Multiplier-Accumulators
2
08/16/2000–LDS.10/2010-P
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