diff options
Diffstat (limited to 'techlibs/xilinx/arith_map.v')
| -rw-r--r-- | techlibs/xilinx/arith_map.v | 211 |
1 files changed, 88 insertions, 123 deletions
diff --git a/techlibs/xilinx/arith_map.v b/techlibs/xilinx/arith_map.v index 5c848d4e6..40c378d16 100644 --- a/techlibs/xilinx/arith_map.v +++ b/techlibs/xilinx/arith_map.v @@ -33,7 +33,21 @@ module _80_xilinx_lcu (P, G, CI, CO); genvar i; -`ifdef _CLB_CARRY +`ifdef _EXPLICIT_CARRY + + wire [WIDTH-1:0] C = {CO, CI}; + wire [WIDTH-1:0] S = P & ~G; + + generate for (i = 0; i < WIDTH; i = i + 1) begin:slice + MUXCY muxcy ( + .CI(C[i]), + .DI(G[i]), + .S(S[i]), + .O(CO[i]) + ); + end endgenerate + +`else localparam CARRY4_COUNT = (WIDTH + 3) / 4; localparam MAX_WIDTH = CARRY4_COUNT * 4; @@ -53,9 +67,9 @@ module _80_xilinx_lcu (P, G, CI, CO); ( .CYINIT(CI), .CI (1'd0), - .DI (G [(Y_WIDTH - 1):i*4]), - .S (S [(Y_WIDTH - 1):i*4]), - .CO (CO[(Y_WIDTH - 1):i*4]), + .DI (G [(WIDTH - 1):i*4]), + .S (S [(WIDTH - 1):i*4]), + .CO (CO[(WIDTH - 1):i*4]), ); // Another one end else begin @@ -63,9 +77,9 @@ module _80_xilinx_lcu (P, G, CI, CO); ( .CYINIT(1'd0), .CI (C [i*4 - 1]), - .DI (G [(Y_WIDTH - 1):i*4]), - .S (S [(Y_WIDTH - 1):i*4]), - .CO (CO[(Y_WIDTH - 1):i*4]), + .DI (G [(WIDTH - 1):i*4]), + .S (S [(WIDTH - 1):i*4]), + .CO (CO[(WIDTH - 1):i*4]), ); end @@ -97,34 +111,6 @@ module _80_xilinx_lcu (P, G, CI, CO); end end endgenerate - -`elsif _EXPLICIT_CARRY - - wire [WIDTH-1:0] C = {CO, CI}; - wire [WIDTH-1:0] S = P & ~G; - - generate for (i = 0; i < WIDTH; i = i + 1) begin:slice - MUXCY muxcy ( - .CI(C[i]), - .DI(G[i]), - .S(S[i]), - .O(CO[i]) - ); - end endgenerate - -`else - - wire [WIDTH-1:0] C = {CO, CI}; - wire [WIDTH-1:0] S = P & ~G; - - generate for (i = 0; i < WIDTH; i = i + 1) begin:slice - MUXCY muxcy ( - .CI(C[i]), - .DI(G[i]), - .S(S[i]), - .O(CO[i]) - ); - end endgenerate `endif endmodule @@ -161,79 +147,7 @@ module _80_xilinx_alu (A, B, CI, BI, X, Y, CO); genvar i; -`ifdef _CLB_CARRY - - localparam CARRY4_COUNT = (Y_WIDTH + 3) / 4; - localparam MAX_WIDTH = CARRY4_COUNT * 4; - localparam PAD_WIDTH = MAX_WIDTH - Y_WIDTH; - - wire [MAX_WIDTH-1:0] S = {{PAD_WIDTH{1'b0}}, AA ^ BB}; - wire [MAX_WIDTH-1:0] DI = {{PAD_WIDTH{1'b0}}, AA & BB}; - - wire [MAX_WIDTH-1:0] C = CO; - - genvar i; - generate for (i = 0; i < CARRY4_COUNT; i = i + 1) begin:slice - - // Partially occupied CARRY4 - if ((i+1)*4 > Y_WIDTH) begin - - // First one - if (i == 0) begin - CARRY4 carry4_1st_part - ( - .CYINIT(CI), - .CI (1'd0), - .DI (DI[(Y_WIDTH - 1):i*4]), - .S (S [(Y_WIDTH - 1):i*4]), - .O (Y [(Y_WIDTH - 1):i*4]), - .CO (CO[(Y_WIDTH - 1):i*4]) - ); - // Another one - end else begin - CARRY4 carry4_part - ( - .CYINIT(1'd0), - .CI (C [i*4 - 1]), - .DI (DI[(Y_WIDTH - 1):i*4]), - .S (S [(Y_WIDTH - 1):i*4]), - .O (Y [(Y_WIDTH - 1):i*4]), - .CO (CO[(Y_WIDTH - 1):i*4]) - ); - end - - // Fully occupied CARRY4 - end else begin - - // First one - if (i == 0) begin - CARRY4 carry4_1st_full - ( - .CYINIT(CI), - .CI (1'd0), - .DI (DI[((i+1)*4 - 1):i*4]), - .S (S [((i+1)*4 - 1):i*4]), - .O (Y [((i+1)*4 - 1):i*4]), - .CO (CO[((i+1)*4 - 1):i*4]) - ); - // Another one - end else begin - CARRY4 carry4_full - ( - .CYINIT(1'd0), - .CI (C [i*4 - 1]), - .DI (DI[((i+1)*4 - 1):i*4]), - .S (S [((i+1)*4 - 1):i*4]), - .O (Y [((i+1)*4 - 1):i*4]), - .CO (CO[((i+1)*4 - 1):i*4]) - ); - end - - end - - end endgenerate - -`elsif _EXPLICIT_CARRY +`ifdef _EXPLICIT_CARRY wire [Y_WIDTH-1:0] S = AA ^ BB; wire [Y_WIDTH-1:0] DI = AA & BB; @@ -333,23 +247,74 @@ module _80_xilinx_alu (A, B, CI, BI, X, Y, CO); `else - wire [Y_WIDTH-1:0] S = AA ^ BB; - wire [Y_WIDTH-1:0] DI = AA & BB; + localparam CARRY4_COUNT = (Y_WIDTH + 3) / 4; + localparam MAX_WIDTH = CARRY4_COUNT * 4; + localparam PAD_WIDTH = MAX_WIDTH - Y_WIDTH; - wire [Y_WIDTH-1:0] C = {CO, CI}; + wire [MAX_WIDTH-1:0] S = {{PAD_WIDTH{1'b0}}, AA ^ BB}; + wire [MAX_WIDTH-1:0] DI = {{PAD_WIDTH{1'b0}}, AA & BB}; + + wire [MAX_WIDTH-1:0] C = CO; + + genvar i; + generate for (i = 0; i < CARRY4_COUNT; i = i + 1) begin:slice + + // Partially occupied CARRY4 + if ((i+1)*4 > Y_WIDTH) begin + + // First one + if (i == 0) begin + CARRY4 carry4_1st_part + ( + .CYINIT(CI), + .CI (1'd0), + .DI (DI[(Y_WIDTH - 1):i*4]), + .S (S [(Y_WIDTH - 1):i*4]), + .O (Y [(Y_WIDTH - 1):i*4]), + .CO (CO[(Y_WIDTH - 1):i*4]) + ); + // Another one + end else begin + CARRY4 carry4_part + ( + .CYINIT(1'd0), + .CI (C [i*4 - 1]), + .DI (DI[(Y_WIDTH - 1):i*4]), + .S (S [(Y_WIDTH - 1):i*4]), + .O (Y [(Y_WIDTH - 1):i*4]), + .CO (CO[(Y_WIDTH - 1):i*4]) + ); + end + + // Fully occupied CARRY4 + end else begin + + // First one + if (i == 0) begin + CARRY4 carry4_1st_full + ( + .CYINIT(CI), + .CI (1'd0), + .DI (DI[((i+1)*4 - 1):i*4]), + .S (S [((i+1)*4 - 1):i*4]), + .O (Y [((i+1)*4 - 1):i*4]), + .CO (CO[((i+1)*4 - 1):i*4]) + ); + // Another one + end else begin + CARRY4 carry4_full + ( + .CYINIT(1'd0), + .CI (C [i*4 - 1]), + .DI (DI[((i+1)*4 - 1):i*4]), + .S (S [((i+1)*4 - 1):i*4]), + .O (Y [((i+1)*4 - 1):i*4]), + .CO (CO[((i+1)*4 - 1):i*4]) + ); + end + + end - generate for (i = 0; i < Y_WIDTH; i = i + 1) begin:slice - MUXCY muxcy ( - .CI(C[i]), - .DI(DI[i]), - .S(S[i]), - .O(CO[i]) - ); - XORCY xorcy ( - .CI(C[i]), - .LI(S[i]), - .O(Y[i]) - ); end endgenerate `endif |