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Altera_Forum
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13 years ago

interfacing Altera Cyclone 3 FPGA to a peripheral using UART

Hi everybody, i'm working in my 1st project in FPGA Altera Cyclone 3 (EP3C25) and i have to connect a peripheral that have only an UART interface to my FPGA. which interface of the FPGA board i...
Altera_Forum's avatar
Altera_Forum
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13 years ago

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From what you said I guess you are targeting a CIII starter board: then you can definitely use the HSMC connector.

Any internal signals implemented in fpga logic can be routed to any fpga I/O pin: so you only need a pcb trace going from fpga pin to a board connector pin.

As I remarked before, you possibly need a buffer (TTL or RS232) to interface the wireless module: read the module datasheet and find out if those uart signaling levels are compatible with fpga I/O ports, which are basically LVTTL.

Also check if the wireless module uart requires handshake signals (rts / cts) besides tx and rx: in this case you'll need 4 lines for the interface, 2 inputs and 2 outputs.

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thanks a lot cris

that's exactly what i mean : i have to use the HSMC connector.

the signaling levels are compatible and for wireless module uart is composed from 1 tx and 1 rx so it will be directly connected to the HSMC.