Specifications

PL 3120/PL 3150/ PL 3170 Power Line Smart Transceiver Data Book 91
A
B
read, resetread, resetread, resetread, reset
t
ret
READ
TIMER/COUNTER
FLAG AND
EVENT
REGISTER
CLEAR FLAG
END OF
io_in()
START OF
io_in()
Count + 6 counts Count – 6 counts
Timer/Counter 1
Timer/Counter 2
Event Register
Event Register
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
2 x XIN Period, Ex: 200 ns @ 10MHz
(minimum time allowed
between consecutive transitions)
Reference Figure 3.40
Optional Pull-Up Resistors
INPUT 1
INPUT 2
IO11
t
fin
Symbol Description Typ @ 10MHz
t
fin
Function call to input sample 90 µs
t
ret
Return from function 88 µs
Figure 3.47 Quadrature Input Latency Values
A call to this function returns the current value of the quadrature count because the last read operation. The counter is
then reset and ready for the next series of input transitions. The count returned is a 16-bit signed binary number, capped
at ±16K.
The number shown in the diagram above is the minimum time allowed between consecutive transitions at either input of
the quadrature function block. For more information, see the, Neuron Chip Quadrature Input Function Interface
engineering bulletin.