ls7266r1 LSI Computer Systems, Inc., ls7266r1 Datasheet - Page 10

• Manufacturer Part Number: ls7266r1
• Description: 24-bit Dual-axis Quadrature Counter
• Manufacturer: LSI Computer Systems, Inc.

7266R1-100704-10
CPT(FLAG-B2)
CT(FLAG-B1)
BT(FLAG-B0)
COMPARE
(Note 8)
X4 CLOCK
(Internal)
CNTR
CY
BW
FIGURE 5. CARRY, BORROW, COMPARE, CARRY TOGGLE, BORROW TOGGLE AND
B
A
X4 CLOCK
(Note 6)
X1 CLOCK
(Note 6)
X2 CLOCK
(Note 6)
IDX
(Note 7)
INDEXI
(Note 5)
Note 5: Shown here is positive index with solid line depicting 1/4 cycle index and dotted line depicting 1/2 cycle index.
Note 6: X1, X2 and X4 clocks are the final internal Up/Down count clocks derived
Note 7: IDX is the synchronized internal "load OL" or "load CNTR" or "reset CNTR" signal based on LCNTR/LOL
A
B
Note 8: COMPARE is generated when PR = CNTR. In this timing diagram it is arbitrarily assumed that PR = 1.
FFFFFD FFFFFE FFFFFF
COMPARE TOGGLE IN X4 QUADRATURE, NORMAL, BINARY COUNT MODE.
FLAG register bit 6.
Either LCNTR/LOL or RCNTR/ABG input can be used as the INDEX input.
from filtered and decoded Quadrature Clock inputs, A and B.
or RCNTR/ABG input being selected as the INDEX input, respectively. This signal is identical with
UP
FIGURE 4. QUADRATURE CLOCK A, B AND INDEX INPUT
UP
0
t
Q3
t
t
Q2
Q1
1
t
Ai
2
t
Q3
t
t
Q2
3
t
idx
t
2
Ai
DOWN
1
DOWN
0
FFFFFF
t
Q3
FFFFFE