/* * nextpnr -- Next Generation Place and Route * * Copyright (C) 2021-22 gatecat * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * */ #ifndef FAB_CFG_H #define FAB_CFG_H #include "fab_defs.h" #include "hashlib.h" #include "idstring.h" #include "nextpnr_assertions.h" #include "nextpnr_namespaces.h" #include #include NEXTPNR_NAMESPACE_BEGIN /* This set of structures is designed to enumerate the different configurable options for a fabulous architecture, affecting the packer etc... */ struct ControlSetConfig { /* CLB signal routing masks for fast validity checking for each unique CLK/CE/SR input to a CLB, add an entry to this vector, and set the bits to 1 for each ff that signal can drive for a CLB with 8 FFs and 2 clocks split at halfway, the first entry would be 0x0F and the second 0xF0 */ std::vector routing; // default 1 shared between all bool have_signal = true; int can_mask = -1; bool can_invert = false; }; struct LogicConfig { // ** Core CLB config unsigned lc_per_clb = 8; // number of logic cells per clb bool split_lc = false; // whether to represent SLICE as a single bel or separate lut+ff (latter important if ff and // lut can be used separately) // ** LUT config unsigned lut_k = 4; // base number of inputs for lookup table enum LutType { SINGLE_LUT, // ... } lut_type = LutType::SINGLE_LUT; // different types of fracturable LUT structure enum LutCascade { NO_CASCADE, // ... } lut_casc = LutCascade::NO_CASCADE; // different types of cascading between LUTs // TODO: other features we might want to represent... // TODO: fracLUT/FF/mux/carry output sharing matrices // ** Carry config enum CarryType { NO_CARRY, // no carry chain HA_PRE_LUT, // half addder before LUT (classic fabulous LC) PG_POST_LUT, // prop/gen logic after a fractured LUT FA_POST_LUT, // full adder after a fractured LUT } carry_type = CarryType::HA_PRE_LUT; int carry_lut_frac = -1; // how the LUT is fractured for PG_POST_LUT/FA_POST_LUT, if the LUT fracturing is different // (or only supported) for carry modes and not in general // ** FF config unsigned ff_per_lc = 1; // number of flipflops per logic cell uint32_t dedi_ff_input = 0; // mask of flipflops in a LC that have dedicated inputs uint32_t dedi_ff_output = 0; // mask of flipflops in a LC that have dedicated outputs ControlSetConfig clk, sr, en; // flipflop control set routing }; struct FabricConfig { LogicConfig clb; // DSP cascading, BRAM, IP rules, IO, clocking ... }; NEXTPNR_NAMESPACE_END #endif