Leon3

Tom Golubev's Leon3 Based Logic Analyzer

Using NIOSII Cyclone dev board

Leon3 grlib-gpl-1.0.20-b3403

 FPGA Usage (1): EP1C20F400C7
  Configuration:                  LUT Usage (%)        Mem Usage (%)   System MHz 
 (1) Default: noFpu, noMMU               56 %               36 %           135.9 
 (2) noFPU, MMU                          65 %               37 %           134.8 
 (3) Bare                                38 %               18 %           126.1 

(1) Command Used: make distclean && time `make synplify && make quartus-synp`

AMBA BUS Notes: (From 1999 ARM ihi 0011A Document)

AMBA signal names

         All AMBA signals are named such that the first letter of the name indicates which bus
         the signal is associated with. A lower case n in the signal name indicates that the signal
         is active LOW, otherwise signal names are always all upper case.
         Test signals have a prefix T regardless of the bus type. More information on test signals
         can be found in Chapter 6 AMBA Test Methodology.

Important Sources / Documents: Nios II / Leon2 Comparison CoSCPU.pdf Leon2 / MicroBlaze / OpenRISC1200 Comparison Evaluation_of_synthesizable_CPU_cores.pdf