LS7166_06 Datasheet, PDF (10/15 Pages) LSI Computer Systems – 24-BIT QUADRATURE COUNTER

(DATA-BUS) 8-15
I/O
BUFFER
D0 - D7
(CHIP SELECT INPUT) CS 2
(READ INPUT) RD 19
(WRITE INPUT) WR 1
(CONTROL /DATA INPUT) C/D 18
(COUNT INPUT) A 6
(COUNT INPUT) B 7
(AB GATE/LOAD LATCH) ABGT/RCTR 4
(LOAD CTR/LOAD LATCH) LCTR/LLTC 3
INPUT
BUFFER
AND
DECODE
LOGIC
(+5V) VDD 5
(GND) VSS 20
PR/OL
ADDRESS
FIGURE 8.
LS7166 BLOCK DIAGRAM
7166-110103-10
D0 -D4
D0, D6,D7
QR
D0 - D7
OCCR
D0 - D7
ICR
D0 - D7
MCR
OSR
CONTROL
LOGIC
STATUS
LOGIC
16 _{CY (CARRY OUT)}
17 BW (BORROW OUT)
COMPARATOR
N1=N2
N1 N2
D0 -D7
PR0
B0 - B7
PR1
B8 - B15
PR2
B16 - B23
B0 - B23
PR/OL ADDRESS
D0 - D7
UP CLOCK
DN CLOCK
OL0
CNTR
Q0 -Q23
OL1
OL2