Echelon FT 3150 Smart Transceiver - Manual (Page 48)

Chapter 3 - Input/Output Interfaces
42 FT 3120 / FT 3150 Smart Transceiver Data Book
control and addressing. See Figures 3.8, 3.9, and 3.10. The IO0 represents the LSB of data. The direction of a byte
port may be changed between input and output dynamically under application control.
Figure 3.9 Byte Input Latency Values
Figure 3.10 Byte Output Latency Values
Symbol Description Typ @ 10MHz
t
fin
Function call to input sample 24 µs
t
ret
Return from function 4 µs
Symbol Description Typ @ 10MHz
t
fout
Function call to update 57 µs
t
ret
Return from function 5 µs
Figure 3.8 Byte I/O
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
High Current Sink Drivers Optional Pull-Up Resis-
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7 IO7
t
ret
t
fin
TIME
INPUT PIN
SAMPLED
END OF
io_in()
START OF
io_in()
INPUT
OUTPUT PIN
UPDATED
END OF
io_out()
START OF
io_out()
t
ret
t
fout
TIME
OUTPUT