Echelon FTXL Hardware - Manual (Page 85)

FTXL Hardware Guide 77
Figure 33 shows the signals while writing the downlink data.
Read Status
(Ready)
Write
Length (9)
Read
Status
(Busy)
Read Status
(Ready)
Write Data
(0x52)
Read
Status
(Busy)
Read Status
(Ready)
Write Data
(0x01)
Read
Status
(Busy)
Read Status
(Ready) Write 0x02, 0x04, 0x08, 0x10,
0x20, 0x40, 0x80. Read status
between each (ready)
Data bytes
Figure 33. Writing the Downlink Data
Note: You can read the data that is being written by looking at the line labeled
D, but because the D0 line switches it function between being a data line and
being the handshake line, be sure to interpret the D line as data only when A0 is
low.
Figure 34 on page 78 shows the signals while reading the uplink data.