SP2-433-160 Datasheet, PDF (15/27 Pages) Radiometrix Ltd – UHF SpacePort Transceiver

TX-SLOT
address
default
formula
valid range
0 - 255 slot number for delayed (polled) TX
Delayed TX in packet units, used when LBT=0 & DBT=1
07
00
delay = TX-Slot * (Preamble*0.0125 + Tpacket + 3*RX ↔ TX + 0.5) ms
where Tpacket = (Number of bytes in packet +2) * 0.075ms
00 to FF
RESET STATE
address
default
RESET STATE OF SWITCHES
The contents of this address are copied into SWITCHES on SP2 reset,
power-up or watchdog Time-Out
08
00
Address 09 to 0F are reserved for future and should not be used by the HOST
EEPROM Addresses 10 TO 3F (48 BYTES) are free for HOST use as general storage.
5.0 DIAGNOSTIC / DEBUG TEST MODES
These special test modes are useful for system testing and debugging
To select these modes the SP2 should be released from reset with the TXR line held low, normal SP2
operation will resume when the TXR is set high, i.e. TXR should be held low while in these test modes.
figure 13: diagnostic mode selection timing diagram
note: For normal operation of the SP2 the TXR line must be held high for either 1ms after a reset
pulse or 100ms after a power up.
There are 8 test modes which are selected by a binary code applied to the SP2's data bus. A 4 bit DIL
switch or rotary HEX switch connected between the data bus and 0V will select the modes (the SP2 has
weak internal pull-up's). Alternatively the HOST may select the test modes by holding TXR low,
resetting the SP2 and driving the required test mode code onto the data bus.
note: The SP2 continuously monitors the mode selected i.e.. a reset is not required on mode changes.
Radiometrix Ltd, SP2 data sheet
page 15