diff options
| -rw-r--r-- | Makefile | 8 | ||||
| -rw-r--r-- | models/sram.v | 101 | ||||
| l--------- | tests/sram_slave/operations.memv | 1 | ||||
| -rw-r--r-- | tests/sram_slave/test.v | 136 |
4 files changed, 246 insertions, 0 deletions
@@ -29,6 +29,7 @@ TESTS := \ intercon \ div \ vga \ + sram_slave \ $(addprefix stack_machine_,$(STACK_MACHINE_TESTS)) # For each of these Makefile will attempt to generate VGAdump.ppm @@ -74,6 +75,13 @@ tests/self/test.vvp : tests/self/operations.mem tests/self/test.v \ -DMASTER_OPERATIONS_COUNT=$(call FILE_LINES,$<) \ $(filter %.v,$^) -o $@ +tests/sram_slave/test.vvp : tests/sram_slave/operations.mem \ + tests/sram_slave/test.v models/sram.v models/master.v \ + design/sram_slave.v include/messages.vh + $(IV) $(IVFLAGS) -s sram_slave_test \ + -DMASTER_OPERATIONS_COUNT=$(call FILE_LINES,$<) \ + $(filter %.v,$^) -o $@ + tests/intercon/test.vvp : tests/intercon/operations.mem tests/intercon/test.v \ models/slave.v models/master.v design/intercon.v \ include/messages.vh diff --git a/models/sram.v b/models/sram.v new file mode 100644 index 0000000..5d1c707 --- /dev/null +++ b/models/sram.v @@ -0,0 +1,101 @@ +`default_nettype none +`timescale 1ns/1ns + +`include "messages.vh" + +`ifndef SIMULATION + `error_SIMULATION_not_defined +; /* Cause syntax error */ +`endif + +module K6R4016V1D_TC10_sram + ( + input wire [17:0] sram_addr, + inout wire [15:0] sram_io, + + input wire sram_cs_not, + input wire sram_oe_not, + input wire sram_we_not + ); + + reg [15:0] memory [2 ** 18 - 1 : 0]; + + wire enabled; + wire read; + wire write; + + assign enabled = !sram_cs_not; + assign read = enabled && !sram_oe_not && sram_we_not; + assign write = enabled && !sram_we_not; + + integer enabled_time; + integer read_time; + integer write_time; + + reg [17:0] addr_last; + + wire addr_unchanged; + assign addr_unchanged = addr_last == sram_addr; + integer addr_unchanged_time; + + initial begin + enabled_time <= 0; + read_time <= 0; + write_time <= 0; + + addr_unchanged_time <= 0; + end + + reg [15:0] output_data; + reg outputting; + assign sram_io = outputting ? output_data : 16'hZZZZ; + + always #1 begin + enabled_time <= enabled ? enabled_time + 1 : 0; + write_time <= write ? write_time + 1 : 0; + read_time <= read ? read_time + 1 : 0; + + addr_last <= sram_addr; + + if (!read && read_time > 0 && read_time < 8) + `MSG(("SRAM: error: output enable signal active for only %dns", + read_time)); + + if (!write && write_time > 0 && write_time < 9) + `MSG(("SRAM: error: write enable signal active for only %dns", + write_time)); + + if (((read && read_time) || (write && write_time)) && addr_unchanged) + addr_unchanged_time <= addr_unchanged_time + 1; + else + addr_unchanged_time <= 0; + + if (write && write_time) begin + if (addr_unchanged) begin + if (write_time >= 9 && addr_unchanged_time >= 8) begin + memory[sram_addr] <= sram_io; + + if (write_time == 9) + `DBG(("SRAM: write of h%x at h%x", sram_io, sram_addr)); + end + end else begin + `MSG(("SRAM: error: address changed during write")); + end + end + + if (read && read_time >= 8) begin + outputting <= 1; + + if (addr_unchanged_time >= 7) begin + output_data <= memory[sram_addr]; + + if (addr_unchanged_time == 7) + `DBG(("SRAM: read of h%x at h%x", memory[sram_addr], sram_addr)); + end else begin + output_data <= 16'hXXXX; + end + end else begin + outputting <= 0; + end + end // always #1 +endmodule // K6R4016V1D_TC10_sram diff --git a/tests/sram_slave/operations.memv b/tests/sram_slave/operations.memv new file mode 120000 index 0000000..68754d0 --- /dev/null +++ b/tests/sram_slave/operations.memv @@ -0,0 +1 @@ +../self/operations.memv
\ No newline at end of file diff --git a/tests/sram_slave/test.v b/tests/sram_slave/test.v new file mode 100644 index 0000000..5e13251 --- /dev/null +++ b/tests/sram_slave/test.v @@ -0,0 +1,136 @@ +`default_nettype none +`timescale 1ns/1ns + +`include "messages.vh" + +`ifndef MASTER_OPERATIONS_COUNT + `error_MASTER_OPERATIONS_COUNT_must_be_defined +; /* Cause syntax error */ +`endif + +`ifndef SIMULATION + `error_SIMULATION_not_defined +; /* Cause syntax error */ +`endif + +module sram_slave_test(); + /* sram chip pins */ + wire [17:0] sram_addr; + wire [15:0] sram_io; + wire sram_cs_not; + wire sram_oe_not; + wire sram_we_not; + + /* slave wishbone interface */ + wire S_ACK_O; + wire S_CLK_I; + wire [17:0] S_ADR_I; + wire [15:0] S_DAT_I; + wire [15:0] S_DAT_O; + wire S_RST_I; + wire S_STB_I; + wire S_WE_I; + wire S_STALL_O; + + /* master wishbone interface */ + wire M_ACK_I; + wire M_CLK_I; + wire [19:0] M_ADR_O; + wire [15:0] M_DAT_I; + wire [15:0] M_DAT_O; + wire M_RST_I; + wire M_STB_O; + wire M_CYC_O; + wire M_WE_O; + wire M_STALL_I; + + /* Non-wishbone */ + wire M_finished; + + master_model + #( + .MASTER_NR(0), + .OPERATIONS_FILE("operations.mem"), + .OPERATIONS_COUNT(`MASTER_OPERATIONS_COUNT) + ) master + ( + .ACK_I(M_ACK_I), + .CLK_I(M_CLK_I), + .ADR_O(M_ADR_O), + .DAT_I(M_DAT_I), + .DAT_O(M_DAT_O), + .RST_I(M_RST_I), + .STB_O(M_STB_O), + .CYC_O(M_CYC_O), + .WE_O(M_WE_O), + .STALL_I(M_STALL_I), + + .finished(M_finished) + ); + + K6R4016V1D_TC10_sram sram + ( + .sram_addr(sram_addr), + .sram_io(sram_io), + .sram_cs_not(sram_cs_not), + .sram_oe_not(sram_oe_not), + .sram_we_not(sram_we_not) + ); + + sram_wb_slave slave + ( + .sram_addr(sram_addr), + .sram_io(sram_io), + .sram_cs_n(sram_cs_not), + .sram_oe_n(sram_oe_not), + .sram_we_n(sram_we_not), + + .ACK_O(S_ACK_O), + .CLK_I(S_CLK_I), + .ADR_I(S_ADR_I), + .DAT_I(S_DAT_I), + .DAT_O(S_DAT_O), + .RST_I(S_RST_I), + .STB_I(S_STB_I), + .WE_I(S_WE_I), + .STALL_O(S_STALL_O) + ); + + reg CLK; + reg RST; + + assign M_ACK_I = S_ACK_O; + assign M_CLK_I = CLK; + assign M_DAT_I = S_DAT_O; + assign M_RST_I = RST; + assign M_STALL_I = S_STALL_O; + + assign S_CLK_I = CLK; + assign S_ADR_I = M_ADR_O[17:0]; /* Ignore 2 topmost bits */ + assign S_DAT_I = M_DAT_O; + assign S_RST_I = RST; + assign S_STB_I = M_STB_O && M_CYC_O; + assign S_WE_I = M_WE_O; + + integer i; + + initial begin + CLK <= 0; + RST <= 1; + + for (i = 0; i < 600; i++) begin + #7; + + CLK <= ~CLK; + + if (CLK) + RST <= 0; + + if (M_finished) + $finish; + end + + $display("error: master hasn't finished its operations in 300 ticks"); + $finish; + end +endmodule // sram_wb_slave_test |