LS7166_06 LSI [LSI Computer Systems], LS7166_06 Datasheet - Page 7

• Manufacturer Part Number: LS7166_06
• Description: 24-BIT QUADRATURE COUNTER
• Manufacturer: LSI [LSI Computer Systems]

7166-110103-7
(INTERNAL)
FIGURE 2 . LOAD COUNTER, UP CLOCK, DOWN CLOCK, COMPARE OUT, CARRY, BORROW
NOTE 1: The counter in this example is assumed to be operating in the binary mode.
NOTE 2: No COMP output is generated here, although PR = CNTR. COMP output is disabled with a counter load command and
NOTE 3: When UP Clock is active, the DN Clock should be held "HIGH" and vice versa.
UP CLK
OR DN CLK
enabled with the rising edge of the next clock, thus eliminating invalid COMP outputs whenever the CNTR is loaded from the PR.
SIGN
COMPT
(Internal)
COMP
BWT
Q2-Q23
DN CLK (B)
(Internal)
(Internal)
CYT
BW
UP CLK (A)
CY
COMP
LTCR
CY
BW
Q0
Q1
T
CBL
CNTR=FFFFFD
T
(PR=CNTR)
LC
T
CH
NOTE 2
CNTR=FFFFFE CNTR=FFFFFF CNTR=000000
T
T
CBH
T
TFH
LCW
FIGURE 3. CLOCK TO CY/BW OUTPUT PROPAGATION DELAYS
T
CBL
T
CL
T
UDD
T
T
CBH
TFH
T
CL
CNTR=0000001
T
TFH
CNTR=000000
CNTR=FFFFFF
T
CH
T
TFL
CNTR=FFFFFE
CNTR=FFFFFD
T
(PR=CNTR)
CBL
T
TFL
T
TFL
T
CBH