LMA2009JC45 Просмотр технического описания (PDF) - LOGIC Devices
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LMA2009JC45 Datasheet PDF : 7 Pages
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DEVICES INCORPORATED
LMA 1009/2009
12 x 12-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)
11 10 9
–20 2–1 2–2
(Sign)
210
2–9 2–10 2–11
11 10 9
–20 2–1 2–2
(Sign)
210
2–9 2–10 2–11
Integer Two’s Complement (TC = 1)
11 10 9
–211 210 29
(Sign)
210
22 21 20
11 10 9
–211 210 29
(Sign)
210
22 21 20
11 10 9
2–1 2–2 2–3
Unsigned Fractional (TC = 0)
210
2–10 2–11 2–12
11 10 9
2–1 2–2 2–3
210
2–10 2–11 2–12
11 10 9
211 210 29
Unsigned Integer (TC = 0)
210
22 21 20
11 10 9
211 210 29
210
22 21 20
FIGURE 1B. OUTPUT FORMATS
XTR
26 25 24
–24 23 22
(Sign)
26 25 24
–226 225 224
(Sign)
26 25 24
22 21 20
MSR
LSR
Fractional Two’s Complement
23 22 21
21 20 2–1
14 13 12
2–8 2–9 2–10
11 10 9
2–11 2–12 2–13
210
2–20 2–21 2–22
Integer Two’s Complement
23 22 21
223 222 221
14 13 12
214 213 212
11 10 9
211 210 29
210
22 21 20
Unsigned Fractional
23 22 21
2–1 2–2 2–3
14 13 12
2–10 2–11 2–12
11 10 9
2–13 2–14 2–15
210
2–22 2–23 2–24
26 25 24
226 225 224
Unsigned Integer
23 22 21
223 222 221
14 13 12
214 213 212
11 10 9
211 210 29
210
22 21 20
Multiplier-Accumulators
2
03/29/2000–LDS.10/2009-L
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