| Line 42... |
Line 42... |
//// ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//
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//
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// CVS Revision History
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// CVS Revision History
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//
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//
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// $Log: not supported by cvs2svn $
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// $Log: or1200_mult_mac.v,v $
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// Revision 2.0 2010/06/30 11:00:00 ORSoC
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// Minor update:
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// Bugs fixed.
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//
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// Revision 1.5 2006/04/09 01:32:29 lampret
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// See OR1200_MAC_SHIFTBY in or1200_defines.v for explanation of the change. Since now no more 28 bits shift for l.macrc insns however for backward compatbility it is possible to set arbitry number of shifts.
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//
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// Revision 1.4 2004/06/08 18:17:36 lampret
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// Revision 1.4 2004/06/08 18:17:36 lampret
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// Non-functional changes. Coding style fixes.
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// Non-functional changes. Coding style fixes.
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//
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//
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// Revision 1.3 2003/04/24 00:16:07 lampret
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// Revision 1.3 2003/04/24 00:16:07 lampret
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// No functional changes. Added defines to disable implementation of multiplier/MAC
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// No functional changes. Added defines to disable implementation of multiplier/MAC
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| Line 308... |
Line 315... |
`endif
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`endif
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else if (mac_op_r3 == `OR1200_MACOP_MAC)
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else if (mac_op_r3 == `OR1200_MACOP_MAC)
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mac_r <= #1 mac_r + mul_prod_r;
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mac_r <= #1 mac_r + mul_prod_r;
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else if (mac_op_r3 == `OR1200_MACOP_MSB)
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else if (mac_op_r3 == `OR1200_MACOP_MSB)
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mac_r <= #1 mac_r - mul_prod_r;
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mac_r <= #1 mac_r - mul_prod_r;
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else if (macrc_op & !ex_freeze)
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else if (macrc_op && !ex_freeze)
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mac_r <= #1 64'h0000_0000_0000_0000;
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mac_r <= #1 64'h0000_0000_0000_0000;
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//
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//
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// Stall CPU if l.macrc is in ID and MAC still has to process l.mac instructions
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// Stall CPU if l.macrc is in ID and MAC still has to process l.mac instructions
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// in EX stage (e.g. inside multiplier)
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// in EX stage (e.g. inside multiplier)
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| Line 320... |
Line 327... |
//
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//
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always @(posedge rst or posedge clk)
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always @(posedge rst or posedge clk)
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if (rst)
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if (rst)
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mac_stall_r <= #1 1'b0;
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mac_stall_r <= #1 1'b0;
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else
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else
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mac_stall_r <= #1 (|mac_op | (|mac_op_r1) | (|mac_op_r2)) & id_macrc_op
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mac_stall_r <= #1 (|mac_op | (|mac_op_r1) | (|mac_op_r2)) & (id_macrc_op | mac_stall_r)
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`ifdef OR1200_IMPL_DIV
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`ifdef OR1200_IMPL_DIV
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| (|div_cntr)
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| (|div_cntr)
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`endif
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`endif
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;
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;
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`else // OR1200_MAC_IMPLEMENTED
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`else // OR1200_MAC_IMPLEMENTED
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