Rick Brown wrote:
> I am a beginner in VHDL programming.
Did you do the usual beginners jobs like a flashing LED and a chasing
light (with variable speed and patterns) first in the simulator and then
on real hardware?
If no: do so.
If so: congrats, you have a general idea about FPGA design.
> I would like to program a 8x8 LEDmatrix using the 75HC595 shiftregister.
Thats a nice advandced beginners exercise.
> So i have 3 inputs for my register: a ST (store) input, SH (shift) input,
> DT(data) input.
And how are those 8x8 LEDs connected to the shift registers? Are there 8
shift registers, each one per line? Or are there 2 shift registers, one
to select the line and one to drive the column?
> The program has to do the following things: display a
> counter counting from 0 to 9 with 1 second delay.
To sort things out: you can simply use 4 LEDs out of that 64 LEDs and
display a binary pattern from "----" (all off like binary 0000) to
"#-#-" (like binary 1010) on them? Or do you have to display a human
readable number on that display?
> The program has to do the following things: display a
> counter counting from 0 to 9 with 1 second delay.
So split up the job:
1. implement a couter, that counts up by 1 per second.
2. display the counters value on the LED
Exercise 2 can be split up to
a. prepare the data that must be shown on the LEDs (i.e. select a pixel
pattern from a ROM)
b. prepare the data for multiplexing (if necessary, depends on the
hardware)
c. send the data to the shift registers
A hint:
First debug the whole design in the simulator. And then go on
hardware.
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