PicoBlaze Embedded Controller Cores

The Official Xilinx Version

The "official" source for the PicoBlaze controller core is directly from the Xilinx PicoBlaze web site. The core is free, but requires that you endure a convoluted registration and download process.

There are a few different versions of the PicoBlaze controller available, each highly-tailored to a specific Xilinx FPGA or CPLD architecture. Use the PicoBlaze version best suited to your target FPGA or CPLD. With a few minor instances, the various PicoBlaze versions are all compatible at the assembler level.

The PicoBlaze-3 core is provided as both VHDL and Verilog source code, which must be compiled using the appropriate Xilinx ISE development software.

Each PicoBlaze version is supported by the included Windows/DOS assembler. Other Design Tools, supporting other computing platforms, are available from other companies.

Versions of the PicoBlaze Embedded Controller Core

PicoBlaze Vesion	Supported FPGA/CPLD	8-bit Registers	Scratchpad RAM	Maximum Program Size
PicoBlaze-3	Spartan-3 Spartan-3E Spartan-3A Spartan-3AN Spartan-3A DSP Virtex-4 Virtex-II Virtex-II Pro	16	64 bytes	1K instructions
PicoBlaze-2	Virtex-II Virtex-II Pro	32	N/A	1K instructions
PicoBlaze	Virtex Virtex-E Spartan-II Spartan-IIE	16	N/A	256 instructions
PicoBlaze-CPLD	CoolRunner-II	8	N/A	256 instructions

Other Versions

Due to its popularity, the PicoBlaze controller has spawned other compatible versions.

PacoBlaze
PacoBlaze is a synthesizable and behavioral Verilog clone of the PicoBlaze embedded microcontroller. PacoBlaze is supported by KCAsm, a lightweight PicoBlaze assembler written in Java.
http://bleyer.org/pacoblaze/