| Specialized functional units (not on every Diamond Standard Series processor core) Multipliers, 16-bit MAC, SIMD, VLIW |
| Memory management and memory protection |
| Region-based memory protection (108Mini, 212GP, 570T, 545CK, and 330HiFi) Full Linux MMU (232L) |
| Miscellaneous processor attributes |
| Little-endian byte ordering |
| 5-stage pipeline |
| Exceptions: non-maskable interrupt (NMI), nine external interrupts, six interrupt priority levels, three 32-bit timer interrupts |
| 32- or 64-entry windowed register file |
| Write buffer: 4/8/16 entries |
| Available interfaces |
| 32-, 64-, or 128-bit PIF width to main system memory or to an on-chip system bus (Vera-based tool kit for PIF bridge implementation and verification) |
| Inbound-PIF requests allow external access to the processor’s local-memory buses |
| AMBA AHB-Lite interface available |
| Two 32-bit TIE ports for the 108Mini, 212GP, and 570T processor cores |
| Two 32-bit TIE queues for the 570T, 330HiFi, and 545CK processor cores |
| On-Chip memory architecture (depends on core) |
| 2- or 4-way set-associative caches (all Diamond cores except 108Mini) |
| Write-through or write-back cache-write policy (all Diamond cores except 108Mini) |
| Line-based cache locking set-associative caches (all Diamond cores except 108Mini) |
| 8- or 16-Kbyte instruction cache, 32- or 64-byte cache line (all Diamond cores except 108Mini) |
| 8- or 16-Kbyte data cache, 32- or 64-byte cache line (all Diamond cores except 108Mini) |
| Designer-selectable number of data RAMs and instruction RAMs |
| Size of data RAM: 0/0.5/1/2/4/8/16/32/64/128 Kbytes |
| Size of instruction RAM: 0/0.5/1/2/4/8/16/32/64/128 Kbytes |
| Processor development and debug capabilities |
| C/C++ callable ISS |
| On-chip debug (OCD) capability: Trace and instruction/data breakpoint support (two hardware-assisted instruction breakpoints and two hardware-assisted data breakpoints) |
| GDB debugger support |
| ISS and Co-Simulation Model (CSM) support for Mentor Graphics’ Seamless CVE (Co-verification environment) |
| Software-development tools |
| High-performance Xtensa C/C++ compiler (XCC) and companion GNU tool chain |
| Eclipse-based Xtensa Xplorer Diamond Edition integrated development environment with graphical visualization capabilities |
| EDA environment support |
| Physical synthesis design flow for major EDA supplier tool sets (Cadence, Magma, Mentor Graphics) |
| Verification support |
| Comprehensive diagnostics for the core |
| Clock-cycle-accurate, pipeline-modeled ISS |
| OSKit overlay for supported real-time operating system |
| Nucleus from Accelerated Technology, Embedded Systems Division, Mentor Graphics |
| Linux from MontaVista Software |
| Bus designer’s toolkit (PIF kit) for bus-bridge design help |
