| Rick Chen | f981e66 | 2018-05-29 10:29:20 +0800 | [diff] [blame] | 1 | AX25 is Andes CPU IP to adopt RISC-V architecture. |
| Rick Chen | 3fafced | 2017-12-26 13:55:59 +0800 | [diff] [blame] | 2 | |
| 3 | Features |
| 4 | ======== |
| 5 | |
| 6 | CPU Core |
| 7 | - 5-stage in-order execution pipeline |
| 8 | - Hardware Multiplier |
| 9 | - radix-2/radix-4/radix-16/radix-256/fast |
| 10 | - Hardware Divider |
| 11 | - Optional branch prediction |
| 12 | - Machine mode and optional user mode |
| 13 | - Optional performance monitoring |
| 14 | |
| 15 | ISA |
| 16 | - RV64I base integer instructions |
| 17 | - RVC for 16-bit compressed instructions |
| 18 | - RVM for multiplication and division instructions |
| 19 | |
| 20 | Memory subsystem |
| 21 | - I & D local memory |
| 22 | - Size: 4KB to 16MB |
| 23 | - Memory subsyetem soft-error protection |
| 24 | - Protection scheme: parity-checking or error-checking-and-correction (ECC) |
| 25 | - Automatic hardware error correction |
| 26 | |
| 27 | Bus |
| 28 | - Interface Protocol |
| 29 | - Synchronous AHB (32-bit/64-bit data-width), or |
| 30 | - Synchronous AXI4 (64-bit data-width) |
| 31 | |
| 32 | Power management |
| 33 | - Wait for interrupt (WFI) mode |
| 34 | |
| 35 | Debug |
| 36 | - Configurable number of breakpoints: 2/4/8 |
| 37 | - External Debug Module |
| 38 | - AHB slave port |
| 39 | - External JTAG debug transport module |
| 40 | |
| 41 | Platform Level Interrupt Controller (PLIC) |
| 42 | - AHB slave port |
| 43 | - Configurable number of interrupts: 1-1023 |
| 44 | - Configurable number of interrupt priorities: 3/7/15/63/127/255 |
| 45 | - Configurable number of targets: 1-16 |
| 46 | - Preempted interrupt priority stack |