DOWN
UP
DOWN
t 8 s
t 8 H
t 6
t 7
FIGURE 6. COUNT (A) AND DIRECTION (B) INPUTS IN NON-QUADRATURE MODE
UP
DOWN
t Q1
A
B
X4 _ CLK
(see not e)
X2 _ CLK
(see not e)
t Q2
X1 _ CLK
(see not e)
Note: x1, x2, and x4 CLKs are internal up/down clocks derived from filtered and decoded quadrature clocks.
FIGURE 7. A/B QUADRATURE CLOCKS vs INTERNAL COUNT CLOCKS
DOWN
UP
A
B
X4 _ CLK
0 0 0 0 0 0
FFFFFE
FFFFFF
0 0 0 0 0 1
0 0 0 0 0 2
FFFFFE FFFFFD
FFFFFC FFFFFD
0 0 0 0 0 1 0 0 0 0 0 0 FFFFFF
CNTR
DFLG/
(SHOWN WITH DTR = 0 0 0 OO1 )
CMP
t fl
CY
BW
t fw
tfl
LFLG/
Note: CNTR values are indicated in 3-byte mode
FIGURE 8. QUADRATURE CLOCKS vs FLAG OUTPUTS
7366-050106-9
LSI [ LSI COMPUTER SYSTEMS ]
