Echelon FT 3150 Smart Transceiver - Manual (Page 64)

Chapter 3 - Input/Output Interfaces
58 FT 3120 / FT 3150 Smart Transceiver Data Book
Figure 3.23 Bitshift Input Latency Values
Symbol Description Typ @ 10MHz
t
fin
Function call to first edge 156.6 µs
t
ret
Return from function 5.4 µs
t
hold
Active clock edge to sampling of input data
15 kbps bit rate
10 kbps bit rate
1 kbps bit rate 9 µs
40.8 µs
938.2 µs
t
aet
Active clock edge to next clock transition
15 kbps bit rate
10 kbps bit rate
1 kbps bit rate 31.8 µs
63.6 µs
961 µs
t
tae
Clock transition to next active clock edge
15 kbps bit rate
10 kbps bit rate
1 kbps bit rate 14.4 µs
14.4 µs
14.4 µs
f Clock frequency = 1/(t
aet
+ t
tae
)
15 kbps bit rate
10 kbps bit rate
1 kbps bit rate 21.6 kHz
12.8 kHz
1.03 kHz
DATA IN
t
aet
Active clock edge assumed to be positive in the above
diagram
t
tae
t
hold
OUTPUT
CLOCK
INPUT SAMPLED
END OF
io_in()
START OF
io_in()
t
ret
t
fin