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74F899SC 数据表(PDF) 3 Page - Fairchild Semiconductor

部件名 74F899SC
功能描述  9-Bit Latchable Transceiver with Parity Generator/Checker
Download  12 Pages
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

74F899SC 数据表(HTML) 3 Page - Fairchild Semiconductor

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Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Note 1: O/E
= ODD/EVEN
Functional Block Diagram
Inputs
Operation
GAB
GBA
SEL LEA LEB
H
H
X
X
X
Busses A and B are 3-STATE.
HL
L
L
H
Generates parity from B[0:7] based on O/E (Note 1). Generated parity
→ APAR.
Generated parity checked against BPAR and output as ERRB.
H
L
L
H
H
Generates parity from B[0:7] based on O/E. Generated parity
→ APAR. Generated
parity checked against BPAR and output as ERRB. Generated parity also fed back
through the A latch for generate/check as ERRA.
HL
L
X
L
Generates parity from B latch data based on O/E. Generated parity
→ APAR.
Generated parity checked against latched BPAR and output as ERRB.
HL
H
X
H
BPAR/B[0:7]
→ APAR/A0:7] Feed-through mode. Generated parity checked against
BPAR and output as ERRB.
H
L
H
H
H
BPAR/B[0:7]
→ APAR/A[0:7]
Feed-through mode. Generated parity checked against BPAR and output as ERRB.
Generated parity also fed back through the A latch for generate/check as ERRA.
L
H
L
H
L
Generates parity for A[0:7] based on O/E. Generated parity
→ BPAR. Generated parity
checked against APAR and output as ERRA.
L
H
L
H
H
Generates parity from A[0:7] based on O/E. Generated parity
→ BPAR. Generated
parity checked against APAR and output as ERRA. Generated parity also fed back
through the B latch for generate/check as ERRB.
L
H
L
L
X
Generates parity from A latch data based on O/E. Generated parity
→ BPAR.
Generated parity checked against latched APAR and output as ERRA.
LH
H
H
L
APAR/A[0:7]
→ BPAR/B[0:7]
Feed-through mode. Generated parity checked against APAR and output as ERRA.
L
H
H
H
H
APAR/A[0:7]
→ BPAR/B[0:7]
Feed-through mode. Generated parity checked against APAR and output as ERRA.
Generated parity also fed back through the B latch for generate/check as ERRB.


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