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README for the spi_boot core
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README for the spi_boot core
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============================
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============================
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Version: $Date: 2005-02-16 19:03:26 $
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Version: $Date: 2005-02-18 06:54:36 $
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Description
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Description
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-----------
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-----------
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bootstrapping of FPGAs. It is able to retrieve the required data from
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bootstrapping of FPGAs. It is able to retrieve the required data from
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SecureDigital (SD) cards or MultiMediaCards (MMC) and manages the FPGA
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SecureDigital (SD) cards or MultiMediaCards (MMC) and manages the FPGA
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configuration process. SD cards as well as MMCs are operated in SPI mode which
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configuration process. SD cards as well as MMCs are operated in SPI mode which
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is part of both standards thus eliminating the need for dedicated
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is part of both standards thus eliminating the need for dedicated
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implementations. The SD/MMC Bootloader fits both. Beyond configuration, this
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implementations. The SD/MMC Bootloader fits both. Beyond configuration, this
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core supports a bootstrapping strategy where multiple sets are stored on one
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core supports a bootstrapping strategy where multiple images are stored on one
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single memory card.
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single memory card.
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For example consider a system completely based on SRAM. The bootloader
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For example consider a system completely based on SRAM. The bootloader
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provides an initial configuration image from the first set to the FPGA. This
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provides an initial configuration data from the first image to the FPGA. This
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image contains a design which pulls the next set from the memory card and
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image contains a design which pulls the next image from the memory card and
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transfers this data to SRAM. In the third step the final FPGA design is
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transfers this data to SRAM. In the third step the final FPGA design is loaded
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loaded from the third set.
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from the third image.
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Features
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Features
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--------
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--------
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* Configuration mode: configurates SRAM based FPGAs via serial slave mode
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* Configuration mode: configurates SRAM based FPGAs via slave serial mode
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(Xilinx and Altera)
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(Xilinx and Altera)
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* Data mode: provides stored data over a simple synchronous serial interface
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* Data mode: provides stored data over a simple synchronous serial interface
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* Broad compatability
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* Broad compatability using SPI mode
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+ SecureDigital cards using dedicated initialization command
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+ SecureDigital cards using dedicated initialization command
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+ MultiMediaCards
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+ MultiMediaCards (see below)
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* Operation triggerd by power-up or card insertion
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* Operation triggerd by power-up or card insertion
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Compatability
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-------------
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These cards have been tested with the SD/MMC Bootloader:
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* SanDisk 128 MB SD
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* SanDisk 64 MB MMC
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* Panasonic 32 MB SD
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Some MMC might fail with this core as not all cards support CMD18
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(READ_MULTIPLE_BLOCK). Please consult the data sheet of your specific
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model. In case your MMC does not implement CMD18 you might want to have a look
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at the FPGA MMC-Card Config project.
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Verification
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Verification
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------------
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The spi_boot core comes with a simple testbench that simulates an SD/MMC
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The spi_boot core comes with a simple testbench that simulates an SD/MMC
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card. All four implementations of the core are verified there in parallel
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card. All four implementations of the core are verified there in parallel
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* SanDisk MMC Product Manual
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* SanDisk MMC Product Manual
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http://www.sandisk.com/pdf/oem/manual-rs-mmcv1.0.pdf
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http://www.sandisk.com/pdf/oem/manual-rs-mmcv1.0.pdf
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* Toshiba SD Card Specification
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* Toshiba SD Card Specification
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http://i.cmpnet.com/chipcenter/memory/images/prod055.pdf
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http://i.cmpnet.com/chipcenter/memory/images/prod055.pdf
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* FPGA MMC-Card Config project
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http://www.opencores.org/projects.cgi/web/mmcfpgaconfig/overview
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