yaju
Joined: 28 Dec 2005
Posts: 1
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 Posted:
Wed Dec 28, 2005 7:54 am Post subject:
serial configuration of Spartan 3 FPGA |
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I am currently developing a system where a user can configure an
Spartan 3 FPGA from a Atmega 128(serial configuration).
The system consists of FPGA, SRAM, Atmega128 and Dataflash. The system
is connected as follows. Atmega128--->Dataflash, Atmega128--->FPGA,
FPGA--->SRAM.
Now I have run into this problem.
As per my board layout the "DIN" signal of the Spartan 3 is connected
to the SRAM where the conifiguration data is expected to be kept.
The other serial configuration signals (INIT, PROG, CCLK, DONE) are
available from the Atmega128.
How would I got about configuring the FPGA. The SRAM is not connected
to the Atmega128.
My though process says that I need to have implemented an SRAM
interface on the FPGA to access it, but then it is a catch-22
situation, as I need to configure the FPGA first. I do have a JTAG
interface available to FPGA (which I implemented if such situations
arose). But if I implement an SRAM interface on the FPGA (using JTAG),
it will void the whole idea of configuring the FPGA from
microcontroller.
Any ideas?
Can I configure the FPGA serially using either the D1, D2, D3 or D4
pins (which for some reason I connected to the Atmega 128)?
Yaju Nagaonkar
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Electrical and Computer Engineering
Brigham Young University
Provo UT 84602 USA |
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