Preserving sectors in an EPCS

Well the reason I asked was to propose some alternatives. Seems like a lots of hassle for 8 bytes of data. You could ...

1 - Remove the ASMI megafunction and let the NIOS write those values to the flash for you through the EPCS controller. You'd have to send a signal to the NIOS to let it know when you wanted it to write the data. And of course you'd have to write the little bit of C-code involved. This allows you to keep the NIOS in your permanent FPGA image. Also, I highly suspect you'd find other uses for the NIOS along the way. Once I started putting embedded processors in my FPGA designs, I became addicted. You'll never get as much use out of so few logic gates as with an embedded processor.

2 - Add an EEPROM to the board for your parameter storage.

Anyway, you know what you're doing. I'm just giving some ideas.

Jake

Hi,

I'm trying to operate the asmi_parallel megafunction to control an EPCS1 serial flash, through a Cyclone device. Now I can't even read the EPCS1 Silicon_ID through the asmi_parallel megafunction. I wrote a small state machine that only asserts the read_sid signal and reads the epcs_id field, but the busy signal is always at '1' , as if the machine never finishes working. EPCS_ID field is always 8'h00. I only raise the read_sid signal once and lowers it after one one clock or at another case after two clock cycles, but the busy is always at '1'. What could be the problem?

I don't have a NIOS core in my system.

Thanks,

Eldad

efargon,

Are you using QuartusII 9.0 sp2 or QII 9.1 sp1 ?

Did you set the "Dual-purpose pins" to "User defined I/O"

ASMI works fine here.