- Introduction
zCore is designed at PWRSemi(2010-2011), a startup try to develop clean-room PowerPC processor for consumer market. Now The unfinished product and company file(biz plan...) is open-sourced.
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File Directories
startup.biz: business file
pippo-0.9: powerpc isa product prototype
/asm assembly example, show how to layout powerpc program, to run on pippo simulation or fpga prototyping
/board currently, only xilinx xupv2p board is supported
/rtl rtl logic implementation, pippo is the code name of first zCore product.
/sim modelsim simulation files, we will support icarus simulator later
/soc soc component files, not used currently, because the pippo cbu(core-bridge-unit) is un-verified
/syn for synthesis
/testbench testbench environment
pippo-riscv: unfinished riscv porting
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Problem to fix When building pippo simulation or implementation, please don't add cbu related files into project
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FAQ 1, Q: How to use xupv2p board A: There is a workable fpga bitstream file(/board/xupv2p/demo_top.bit). And there are two methods to download application programs to xupv2p board's on-chip memory: a), initialize in the rtl memory(/rtl/verilog/imx_uocm.v), then implement(syn/translate/map/p&r) the system and generate fpga bitstream files. In this flow, the uartlite/uocm work in normal mode, you should put DIP switch 3 up(on/closed/logic 0).
b), when change software programs, to avoid fpga implement flow , you can download software bin files from PC to system's memory space(uocm). In this mode, the uartlite/uocm work in burning mode, firstly you should put DIP switch 3 down(off/open/logic 0), then download software program bin files using uart tools(115200, 8 data bits, 2 stop bits, no parity). After burning complete(LED3 turn off), put DIP switch 3 on to exit burning mode.
In both mode, you should put DIP switch 0/1/2 down(off/open/logic 0), LED 0/1/2 will show the system's heartbeat/imx request/imxresponse state -
Acknowledge: Some rtl logic is directly from previous great open source processor projects, such as Sun Microsystem's MicroSPARC/OpenSPARC T1/T2, Gaisler research's LEON, OpenRISC...
SPECIAL THANKS TO OUR ANGEL INVESTOR AFAN
*** IMPORTANT ***
Author will NOT maintain/update the project ANY MORE.