Mapping Dual Port Ram into Microblaze address space

Jun 09, 2005 3 Replies
M

Hallo, I have created a user logic template for obp bus with Create/Import Wizard of EDK with the feature: user logic address range support.



Into file user_logic.vhd I have created a Dual port ram with core generator to replace the ram example.



Is it possible to map port B of dual port ram into microblaze address space?



In this way I could use a C pointer that points to microblaze mapped address space.



Otherwise the only way to access it is to use Xio_in and Xio_out ?



Many Thanks in advance to everyone Marco



Sorry for my bad english


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F

Yes, connect the address bits of the opb bus to your bram port. Make a state machine which steers the enable and write_enable and the acknowledge to the opb bus.

Yes you can.

AFAIK, you should always be able to access your custom device by using pointers

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P

In EDK, if you browse the install software directory for the opb libraries, you can possibly use the bram_controller.vhd for your application. You just have connect the bram_controller to the IPIF signals and set up the read and write enable lines i.e. bus2ip_arcs(0) & bus2ip_rnw for the read enable and the same for the write enable but with not(bus2ip_rnw). Within the BRAM_controller, a dual-port RAM is instantiated and the control is all setup correctly.

Paul

Marco wrote:

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