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minor rtl edits and cleanups (#935)
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@stnolting
stnolting authored Jun 30, 2024
2 parents 24ab047 + 495f93c commit 0ca0582
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -29,6 +29,7 @@ mimpid = 0x01040312 -> Version 01.04.03.12 -> v1.4.3.12

| Date | Version | Comment | Ticket |
|:----:|:-------:|:--------|:------:|
| 30.06.2024 | 1.10.0.6 | minor rtl edits and cleanups | [#935](https://github.com/stnolting/neorv32/pull/935) |
| 29.06.2024 | 1.10.0.5 | :warning: rework and optimize custom functions unit (CFU) interface; simplified illegal RVC decoding | [#932](https://github.com/stnolting/neorv32/pull/932) |
| 23.06.2024 | 1.10.0.4 | minor rtl edits/cleanups | [#931](https://github.com/stnolting/neorv32/pull/931) |
| 22.06.2024 | 1.10.0.3 | UARTs: add flags to clear RX/TX FIFOs; DMA: add FIRQ trigger type configuration flag | [#930](https://github.com/stnolting/neorv32/pull/930) |
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13 changes: 5 additions & 8 deletions rtl/core/neorv32_cfs.vhd
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Expand Up @@ -147,14 +147,11 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
cfs_reg_wr(0) <= (others => '0');
cfs_reg_wr(1) <= (others => '0');
cfs_reg_wr(2) <= (others => '0');
cfs_reg_wr(3) <= (others => '0');
--
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
cfs_reg_wr(0) <= (others => '0');
cfs_reg_wr(1) <= (others => '0');
cfs_reg_wr(2) <= (others => '0');
cfs_reg_wr(3) <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
elsif rising_edge(clk_i) then -- synchronous interface for read and write accesses
-- transfer/access acknowledge --
bus_rsp_o.ack <= bus_req_i.stb;
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1 change: 1 addition & 0 deletions rtl/core/neorv32_cpu.vhd
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Expand Up @@ -129,6 +129,7 @@ begin
cond_sel_string_f(CPU_EXTENSION_RISCV_C, "c", "" ) &
cond_sel_string_f(CPU_EXTENSION_RISCV_B, "b", "" ) &
cond_sel_string_f(CPU_EXTENSION_RISCV_U, "u", "" ) &
cond_sel_string_f(true, "x", "" ) & -- always enabled
cond_sel_string_f(true, "_zicsr", "" ) & -- always enabled
cond_sel_string_f(CPU_EXTENSION_RISCV_Zicntr, "_zicntr", "" ) &
cond_sel_string_f(CPU_EXTENSION_RISCV_Zicond, "_zicond", "" ) &
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13 changes: 2 additions & 11 deletions rtl/core/neorv32_cpu_control.vhd
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Expand Up @@ -389,7 +389,7 @@ begin
bus_req_o.rw <= '0'; -- read-only
bus_req_o.src <= '1'; -- source = instruction fetch
bus_req_o.rvso <= '0'; -- cannot be a reservation set operation
bus_req_o.fence <= ctrl.lsu_fence; -- fence(.i) operation, valid without STB being set
bus_req_o.fence <= ctrl.lsu_fence; -- fence operation, valid without STB being set


-- Instruction Prefetch Buffer (FIFO) -----------------------------------------------------
Expand Down Expand Up @@ -766,21 +766,16 @@ begin
execute_engine.ir_nxt <= execute_engine.ir;
execute_engine.is_ci_nxt <= execute_engine.is_ci;
execute_engine.pc_we <= '0';
--
issue_engine.ack <= '0';
--
fetch_engine.reset <= '0';
--
trap_ctrl.env_enter <= '0';
trap_ctrl.env_exit <= '0';
trap_ctrl.instr_be <= '0';
trap_ctrl.ecall <= '0';
trap_ctrl.ebreak <= '0';
trap_ctrl.hwtrig <= '0';
--
csr.we_nxt <= '0';
csr.re_nxt <= '0';
--
ctrl_nxt <= ctrl_bus_zero_c; -- all zero/off by default (default ALU operation = ZERO, adder.out = ADD)

-- ALU sign control --
Expand Down Expand Up @@ -1306,7 +1301,7 @@ begin
illegal_cmd <= not bool_to_ulogic_f(CPU_EXTENSION_RISCV_Zxcfu); -- all encodings valid if CFU enable

when others =>
illegal_cmd <= '1'; -- undefined/illegal opcode
illegal_cmd <= '1'; -- undefined/unimplemented/illegal opcode

end case;
end process illegal_check;
Expand Down Expand Up @@ -2094,7 +2089,6 @@ begin
end case;
end process csr_read_access;


-- CSR read-data gate --
csr_read_reg: process(rstn_i, clk_i)
begin
Expand Down Expand Up @@ -2136,7 +2130,6 @@ begin
end if;
end process cnt_we;


-- hardware counters --
cnt_gen:
for i in 0 to 2+hpm_num_c generate
Expand Down Expand Up @@ -2170,7 +2163,6 @@ begin

end generate; -- /cnt_gen


-- read-back --
cnt_connect: process(cnt)
begin
Expand Down Expand Up @@ -2240,7 +2232,6 @@ begin

end generate;


-- no HPMs implemented --
hpmevent_gen_disable:
if (not CPU_EXTENSION_RISCV_Zihpm) or (hpm_num_c = 0) generate
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8 changes: 4 additions & 4 deletions rtl/core/neorv32_cpu_lsu.vhd
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Expand Up @@ -36,8 +36,8 @@ entity neorv32_cpu_lsu is
be_store_o : out std_ulogic; -- bus error on store data access
pmp_fault_i : in std_ulogic; -- PMP read/write access fault
-- data bus --
bus_req_o : out bus_req_t; -- request
bus_rsp_i : in bus_rsp_t -- response
bus_req_o : out bus_req_t; -- request
bus_rsp_i : in bus_rsp_t -- response
);
end neorv32_cpu_lsu;

Expand Down Expand Up @@ -101,8 +101,8 @@ begin
-- source identifier --
bus_req_o.src <= '0'; -- 0 = data access

-- data/instruction fence(.i)
bus_req_o.fence <= ctrl_i.lsu_fence; -- this is valid even without STB being set
-- data fence --
bus_req_o.fence <= ctrl_i.lsu_fence; -- this is valid without STB being set


-- Data Output - Alignment and Byte Enable ------------------------------------------------
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12 changes: 5 additions & 7 deletions rtl/core/neorv32_crc.vhd
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Expand Up @@ -54,13 +54,11 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
crc.mode <= (others => '0');
crc.poly <= (others => '0');
crc.data <= (others => '0');
we_ack <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
crc.mode <= (others => '0');
crc.poly <= (others => '0');
crc.data <= (others => '0');
we_ack <= (others => '0');
elsif rising_edge(clk_i) then
-- bus handshake --
bus_rsp_o.data <= (others => '0');
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4 changes: 1 addition & 3 deletions rtl/core/neorv32_debug_dm.vhd
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Expand Up @@ -641,9 +641,7 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
dci.data_reg <= (others => '0');
dci.halt_ack <= '0';
dci.resume_ack <= '0';
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4 changes: 1 addition & 3 deletions rtl/core/neorv32_dma.vhd
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Expand Up @@ -112,9 +112,7 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
config.enable <= '0';
config.auto <= '0';
config.fence <= '0';
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6 changes: 2 additions & 4 deletions rtl/core/neorv32_gpio.vhd
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Expand Up @@ -40,10 +40,8 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
dout <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
dout <= (others => '0');
elsif rising_edge(clk_i) then
-- bus handshake --
bus_rsp_o.ack <= bus_req_i.stb;
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14 changes: 6 additions & 8 deletions rtl/core/neorv32_gptmr.vhd
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Expand Up @@ -82,14 +82,12 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
ctrl <= (others => '0');
trig_match <= '0';
trig_capture <= '0';
timer.cnt_we <= '0';
timer.thres <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
ctrl <= (others => '0');
trig_match <= '0';
trig_capture <= '0';
timer.cnt_we <= '0';
timer.thres <= (others => '0');
elsif rising_edge(clk_i) then
-- defaults --
bus_rsp_o.ack <= bus_req_i.stb;
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22 changes: 11 additions & 11 deletions rtl/core/neorv32_intercon.vhd
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Expand Up @@ -480,16 +480,16 @@ begin

-- Combine Device Ports -------------------------------------------------------------------
-- -------------------------------------------------------------------------------------------
dev_00_req_o <= dev_req(00); dev_rsp(00) <= dev_00_rsp_i;
dev_01_req_o <= dev_req(01); dev_rsp(01) <= dev_01_rsp_i;
dev_02_req_o <= dev_req(02); dev_rsp(02) <= dev_02_rsp_i;
dev_03_req_o <= dev_req(03); dev_rsp(03) <= dev_03_rsp_i;
dev_04_req_o <= dev_req(04); dev_rsp(04) <= dev_04_rsp_i;
dev_05_req_o <= dev_req(05); dev_rsp(05) <= dev_05_rsp_i;
dev_06_req_o <= dev_req(06); dev_rsp(06) <= dev_06_rsp_i;
dev_07_req_o <= dev_req(07); dev_rsp(07) <= dev_07_rsp_i;
dev_08_req_o <= dev_req(08); dev_rsp(08) <= dev_08_rsp_i;
dev_09_req_o <= dev_req(09); dev_rsp(09) <= dev_09_rsp_i;
dev_00_req_o <= dev_req(0); dev_rsp(0) <= dev_00_rsp_i;
dev_01_req_o <= dev_req(1); dev_rsp(1) <= dev_01_rsp_i;
dev_02_req_o <= dev_req(2); dev_rsp(2) <= dev_02_rsp_i;
dev_03_req_o <= dev_req(3); dev_rsp(3) <= dev_03_rsp_i;
dev_04_req_o <= dev_req(4); dev_rsp(4) <= dev_04_rsp_i;
dev_05_req_o <= dev_req(5); dev_rsp(5) <= dev_05_rsp_i;
dev_06_req_o <= dev_req(6); dev_rsp(6) <= dev_06_rsp_i;
dev_07_req_o <= dev_req(7); dev_rsp(7) <= dev_07_rsp_i;
dev_08_req_o <= dev_req(8); dev_rsp(8) <= dev_08_rsp_i;
dev_09_req_o <= dev_req(9); dev_rsp(9) <= dev_09_rsp_i;
dev_10_req_o <= dev_req(10); dev_rsp(10) <= dev_10_rsp_i;
dev_11_req_o <= dev_req(11); dev_rsp(11) <= dev_11_rsp_i;
dev_12_req_o <= dev_req(12); dev_rsp(12) <= dev_12_rsp_i;
Expand Down Expand Up @@ -554,7 +554,7 @@ end neorv32_bus_io_switch_rtl;


-- ================================================================================ --
-- NEORV32 SoC - PProcessor Bus Infrastructure: Reservation Set Control --
-- NEORV32 SoC - Processor Bus Infrastructure: Reservation Set Control --
-- -------------------------------------------------------------------------------- --
-- Reservation set controller for the A (atomic) ISA extension's LR.W --
-- (load-reservate) and SC.W (store-conditional) instructions. Only a single --
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17 changes: 7 additions & 10 deletions rtl/core/neorv32_mtime.vhd
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Expand Up @@ -49,16 +49,13 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
mtimecmp_lo <= (others => '0');
mtimecmp_hi <= (others => '0');
mtime_we <= (others => '0');
mtime_lo <= (others => '0');
mtime_lo_cry <= (others => '0');
mtime_hi <= (others => '0');
--
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
mtimecmp_lo <= (others => '0');
mtimecmp_hi <= (others => '0');
mtime_we <= (others => '0');
mtime_lo <= (others => '0');
mtime_lo_cry <= (others => '0');
mtime_hi <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
elsif rising_edge(clk_i) then
-- mtimecmp --
if (bus_req_i.stb = '1') and (bus_req_i.rw = '1') and (bus_req_i.addr(3) = '1') then
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21 changes: 9 additions & 12 deletions rtl/core/neorv32_neoled.vhd
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Expand Up @@ -123,18 +123,15 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
ctrl.enable <= '0';
ctrl.mode <= '0';
ctrl.strobe <= '0';
ctrl.clk_prsc <= (others => '0');
ctrl.irq_conf <= '0';
ctrl.t_total <= (others => '0');
ctrl.t0_high <= (others => '0');
ctrl.t1_high <= (others => '0');
--
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
ctrl.enable <= '0';
ctrl.mode <= '0';
ctrl.strobe <= '0';
ctrl.clk_prsc <= (others => '0');
ctrl.irq_conf <= '0';
ctrl.t_total <= (others => '0');
ctrl.t0_high <= (others => '0');
ctrl.t1_high <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
elsif rising_edge(clk_i) then
-- bus handshake --
bus_rsp_o.ack <= bus_req_i.stb;
Expand Down
4 changes: 1 addition & 3 deletions rtl/core/neorv32_onewire.vhd
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Expand Up @@ -104,9 +104,7 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
ctrl.enable <= '0';
ctrl.clk_prsc <= (others => '0');
ctrl.clk_div <= (others => '0');
Expand Down
10 changes: 5 additions & 5 deletions rtl/core/neorv32_package.vhd
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Expand Up @@ -29,7 +29,7 @@ package neorv32_package is

-- Architecture Constants -----------------------------------------------------------------
-- -------------------------------------------------------------------------------------------
constant hw_version_c : std_ulogic_vector(31 downto 0) := x"01100005"; -- hardware version
constant hw_version_c : std_ulogic_vector(31 downto 0) := x"01100006"; -- hardware version
constant archid_c : natural := 19; -- official RISC-V architecture ID
constant XLEN : natural := 32; -- native data path width

Expand Down Expand Up @@ -735,14 +735,14 @@ package neorv32_package is
REGFILE_HW_RST : boolean := false;
-- Physical Memory Protection (PMP) --
PMP_NUM_REGIONS : natural range 0 to 16 := 0;
PMP_MIN_GRANULARITY : natural := 4;
PMP_MIN_GRANULARITY : natural range 4 to 2**30 := 4;
PMP_TOR_MODE_EN : boolean := true;
PMP_NAP_MODE_EN : boolean := true;
-- Hardware Performance Monitors (HPM) --
HPM_NUM_CNTS : natural range 0 to 13 := 0;
HPM_CNT_WIDTH : natural range 0 to 64 := 40;
-- Atomic Memory Access - Reservation Set Granularity --
AMO_RVS_GRANULARITY : natural := 4;
AMO_RVS_GRANULARITY : natural range 4 to 2**30 := 4;
-- Internal Instruction memory (IMEM) --
MEM_INT_IMEM_EN : boolean := false;
MEM_INT_IMEM_SIZE : natural := 16*1024;
Expand All @@ -762,8 +762,8 @@ package neorv32_package is
XBUS_TIMEOUT : natural := 255;
XBUS_REGSTAGE_EN : boolean := false;
XBUS_CACHE_EN : boolean := false;
XBUS_CACHE_NUM_BLOCKS : natural := 64;
XBUS_CACHE_BLOCK_SIZE : natural := 32;
XBUS_CACHE_NUM_BLOCKS : natural range 1 to 256 := 64;
XBUS_CACHE_BLOCK_SIZE : natural range 1 to 2**16 := 32;
-- Execute in-place module (XIP) --
XIP_EN : boolean := false;
XIP_CACHE_EN : boolean := false;
Expand Down
10 changes: 4 additions & 6 deletions rtl/core/neorv32_pwm.vhd
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Expand Up @@ -60,12 +60,10 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
enable <= '0';
prsc <= (others => '0');
pwm_ch <= (others => (others => '0'));
bus_rsp_o <= rsp_terminate_c;
enable <= '0';
prsc <= (others => '0');
pwm_ch <= (others => (others => '0'));
elsif rising_edge(clk_i) then
-- bus handshake --
bus_rsp_o.ack <= bus_req_i.stb;
Expand Down
4 changes: 1 addition & 3 deletions rtl/core/neorv32_sdi.vhd
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Expand Up @@ -111,9 +111,7 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
ctrl.enable <= '0';
ctrl.clr_rx <= '0';
ctrl.irq_rx_avail <= '0';
Expand Down
4 changes: 1 addition & 3 deletions rtl/core/neorv32_slink.vhd
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Expand Up @@ -115,9 +115,7 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
ctrl.enable <= '0';
ctrl.rx_clr <= '0';
ctrl.tx_clr <= '0';
Expand Down
4 changes: 1 addition & 3 deletions rtl/core/neorv32_spi.vhd
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Expand Up @@ -121,9 +121,7 @@ begin
bus_access: process(rstn_i, clk_i)
begin
if (rstn_i = '0') then
bus_rsp_o.ack <= '0';
bus_rsp_o.err <= '0';
bus_rsp_o.data <= (others => '0');
bus_rsp_o <= rsp_terminate_c;
ctrl.enable <= '0';
ctrl.cpha <= '0';
ctrl.cpol <= '0';
Expand Down
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