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• Parallel ports and data rates

  Paúl • 01/21/2015 at 03:12 • 0 comments

  In order to interface to the VFD, I need a datasheet for it. I found that datasheet here: http://datasheet.elcodis.com/pdf/11/45/114557/gu140x32f-7000.pdf.

  As I need a high refresh rate to display interesting information, and I want to learn how to implement something in Verilog that isn't an RS232 port, I'm using the VFD's parallel port. I have heard that these VFDs can manage 60-70Hz refresh rates so I'll try pushing the limits with animation. As a rough calculation, the data I'll be sending at 60Hz over each of the 8 parallel ports is

  which is certainly manageable with a 50MHz Spartan6.

  Pinouts for the parallel connector:

  Pin number	Signal name	Function	Direction
  1	GND	Ground	I
  2	VCC	Power (6VDC max)	I
  3	NC	-	-
  4	RS	Switch signal	I
  5	/WR	Data write	I
  6	/RD	Data read	I
  7	D0	Data input	IO
  8	D1	Data input	IO
  9	D2	Data input	IO
  10	D3	Data input	IO
  11	D4	Data input	IO
  12	D5	Data input	IO
  13	D6	Data input	IO
  14	D7	Data input	IO

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