JTAG access to Block/Distributed memories

[portolan]

Hello,

I have a design that needs to read/write data to a RAM from a JTAG connection.Before starting to write my own VHDL controller, I was wondering: are there any Xilinx primitives that allow JTAG-accessible RAMs ?

Best regards,

Michele

[kkn]

Hi Michele,

You can try to use the VIO core in chipscope and try to write the BRAM contents.

http://www.xilinx.com/products/intellectual-property/chipscope_vio.htm

Hope this helps.

--Krishna

[barriet]

The PicoBlaze (kcpsm6/kcpsm3) JTAG bootloader also does this (writes -> BRAM port via JTAG operations).

See the documentation for the full details.

http://www.xilinx.com/products/ipcenter/picoblaze.htm

 [download link on left side]

http://forums.xilinx.com/t5/PicoBlaze/Release-7-of-KCPSM6-What-s-New/m-p/363487

http://forums.xilinx.com/xlnx/board/message?board.id=PicoBlaze&thread.id=40 (PicoBlaze FAQ)

Cheers,

bt