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Programmable Hardware Manual (PHM)
© Tibbo Technology Inc.
It is important to make the PCB wire connections between the Ethernet port pins of
the EM1202 and external magnetics circuitry as short as possible. Making the wires
too long may cause the noise level generated by your PCB to surpass the maximum
radiated emission limits stipulated by FCC/CE regulations. Additionally, longer
Ethernet lines on the PCB will make your board more susceptible to the damage from
the ESD (electrostatic discharge). Follow these three recommendations:
·
Route TX+, TX-, RX+, RX- in such a way that they do not cross each other. Try
to avoid using vias (keep on the same board side).
·
Keep more or less uniform distance between "+" and "-" traces of each pair.
The EM1202 also has two
Ethernet status LED control lines
- see here for details.
4.6.1.3
Serial Ports
The EM1202 has four serial ports that can work in one of the three modes: UART,
Wiegand, or clock/data. All three modes are described in detail in the documentation
for the serial (ser.) object found inside the TIDE, TiOS, Tibbo BASIC, and Tibbo C
Manual. Additionally, see the Platform-dependent Programming Information section
inside the EM1202 platform documentation (same manual).
4.6.1.4
Square Wave Generator
The square wave generator can produce a square wave output on pin GPIO29/CO of
the EM1202. This output is primarily intended for generating audio signals using
buzzer and is covered in the beep (beep.) object -- see the TIDE, TiOS, Tibbo
BASIC, and Tibbo C Manual.
4.6.1.5
Flash and EEPROM Memory
The EM1202 has 512KBytes or 1024KBytes of flash memory and 2KBytes of EEPROM
memory.
The first 64KBytes of flash memory are used to store the TiOS firmware. When you
are performing a firmware upgrade it is this memory you are saving the firmware
binary into.