diff options
Diffstat (limited to 'src/rtl/shr32.v')
| -rw-r--r-- | src/rtl/shr32.v | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/src/rtl/shr32.v b/src/rtl/shr32.v index 66b15c3..40ef111 100644 --- a/src/rtl/shr32.v +++ b/src/rtl/shr32.v @@ -2,10 +2,11 @@ // // shr32.v // ------- -// 32bit right shift with carry in / carry out. +// One bit right shift with carry in and carry out. +// Used in the montprod module of the modexp core. // // -// Author: Peter Magnusson +// Author: Peter Magnusson, Joachim Strömbergson // Copyright (c) 2015, NORDUnet A/S All rights reserved. // // Redistribution and use in source and binary forms, with or without @@ -36,18 +37,20 @@ // //====================================================================== -module shr32( - input wire [31 : 0] a, - input wire carry_in, - output wire [31 : 0] adiv2, - output wire carry_out - ); +module shr #(parameter OPW = 32) + ( + input wire [(OPW - 1) : 0] a, + input wire carry_in, - assign adiv2 = {carry_in, a[31 : 1]}; + output wire [(OPW - 1) : 0] adiv2, + output wire carry_out + ); + + assign adiv2 = {carry_in, a[(OPW - 1) : 1]}; assign carry_out = a[0]; -endmodule // shr32 +endmodule // shr //====================================================================== -// EOF shr32.v +// EOF shr.v //====================================================================== |