15 Programmable Hardware Manual (PHM)
© Tibbo Technology Inc.
It is important to make the PCB traces interconnecting the Ethernet port pins of the
EM2000 and external magnetics circuitry as short as possible. Making the traces 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 decrease the performance of your Ethernet port.
Note that the EM2000 has an onboard Ethernet link LED (yellow), as well as two
Ethernet status LED control lines.
Using the EM2000 with the host board designed for the EM1000
The EM2000 will work with boards designed for our EM1000 module. The circuit
diagram for attaching Ethernet magnetics to the EM1000 is slightly different.
Specifically, the EM1000 has AVCC lines, and the EM2000 does not. Pins 62 and 65,
that used to be AVCC pins on the EM1000 are left unconnected on the EM2000
product (so it is OK if your board has these lines).
4.1.1.4
Serial Ports
The EM2000 has four serial ports that can work in one of the three modes: UART,
Wiegand, or clock/data.
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