| AR# |
30923 |
| Part |
Config-SPI |
| Last Modified |
2008-05-15 00:00:00.0 |
| Status |
Active |
| Keywords |
STARTUP_VIRTEX5, Flash, ST, Atmel, UG191, CCLK, D_IN, DIN, user data, custom data |
Description
Keywords: STARTUP_VIRTEX5, Flash, ST, Atmel, UG191, CCLK, D_IN, DIN, user data, custom data
How can I access my SPI Flash after configuration for data storage in a Virtex-5 Design?
The D_IN and CCLK are dedicated configuration pins, so what should be used to access custom data of my SPI memory?
Solution
Unlike the Spartan-3E/A/AN/A-DSP devices, CCLK and D_IN for Virtex-5 FPGAs are dedicated configuration pins and cannot be assigned as user IO in a design post configuration. It is possible to use the STARTUP_VIRTEX5 primitive to access the dedicated D_IN and CCLK from User logic post configuration. The USRCCLK0 input of the primitive will drive CCLK externally and the DINSPI output of the primitive will gather all data internally, coming from the Flash.
The STARTUP_VIRTEX5 primitive is documented in the Virtex-5 FPGA Configuration User Guide (UG191) -> Chapter 4: User Primitives -> STARTUP_VIRTEX5, accessible at:
http://www.xilinx.com/support/documentation/virtex-5.htmInformation on instantiating this primitive is in the Virtex-5 Libraries Guide for HDL Designs, accessible at:
http://www.xilinx.com/support/documentation/index.htm -> Design Tools Tab
PROMGen in iMPACT can be used to create the custom MCS file containing configuration and user data. This cam be done with the -data_file switch.
