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56 lines
1.5 KiB
Verilog
56 lines
1.5 KiB
Verilog
/*******************************************************************************
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* Function: ENOC Command Decoder
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* Author: Andreas Olofsson
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* License: MIT (see LICENSE file in OH! repository)
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*
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* see ./enoc_pack.v
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*
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******************************************************************************/
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module enoc_decode
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(
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//Packet Command
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input [15:0] cmd_in,
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//Write
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output cmd_write,
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output cmd_write_stop,
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//Read
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output cmd_read,
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output cmd_atomic_add,
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output cmd_atomic_and,
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output cmd_atomic_or,
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output cmd_atomic_xor,
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output cmd_cas,
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//Fields
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output [3:0] cmd_opcode,
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output [3:0] cmd_length,
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output [2:0] cmd_size,
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output [7:0] cmd_user
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);
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//############################################
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// Command Decode
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//############################################
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//Writes
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assign cmd_write = ~cmd_in[3];
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assign cmd_write_stop = cmd_in[3:0]==1001;
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//Reads/atomics
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assign cmd_read = cmd_in[3:0]==1000;
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assign cmd_atomic_cas = cmd_in[3:0]==1011;
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assign cmd_atomic_add = cmd_in[3:0]==1100;
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assign cmd_atomic_and = cmd_in[3:0]==1101;
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assign cmd_atomic_or = cmd_in[3:0]==1110;
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assign cmd_atomic_xor = cmd_in[3:0]==1111;
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//Field Decode
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assign cmd_opcode[3:0] = cmd_in[3:0];
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assign cmd_length[3:0] = cmd_in[7:4];
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assign cmd_size[2:0] = cmd_in[10:8];
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assign cmd_user[7:0] = cmd_in[15:8];
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endmodule // enoc_decode
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