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// $Id: aeMB_ibuf.v,v 1.5 2007-11-14 22:14:34 sybreon Exp $
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// $Id: aeMB_ibuf.v,v 1.6 2007-11-14 23:39:51 sybreon Exp $
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//
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//
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// AEMB INSTRUCTION BUFFER
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// AEMB INSTRUCTION BUFFER
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//
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//
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// Copyright (C) 2004-2007 Shawn Tan Ser Ngiap <shawn.tan@aeste.net>
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// Copyright (C) 2004-2007 Shawn Tan Ser Ngiap <shawn.tan@aeste.net>
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//
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//
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//
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//
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// You should have received a copy of the GNU Lesser General Public
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// You should have received a copy of the GNU Lesser General Public
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// License along with AEMB. If not, see <http://www.gnu.org/licenses/>.
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// License along with AEMB. If not, see <http://www.gnu.org/licenses/>.
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//
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//
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// $Log: not supported by cvs2svn $
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// $Log: not supported by cvs2svn $
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// Revision 1.5 2007/11/14 22:14:34 sybreon
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// Changed interrupt handling system (reported by M. Ettus).
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//
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// Revision 1.4 2007/11/10 16:39:38 sybreon
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// Revision 1.4 2007/11/10 16:39:38 sybreon
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// Upgraded license to LGPLv3.
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// Upgraded license to LGPLv3.
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// Significant performance optimisations.
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// Significant performance optimisations.
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//
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//
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// Revision 1.3 2007/11/03 08:34:55 sybreon
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// Revision 1.3 2007/11/03 08:34:55 sybreon
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// of the pipeline so that stalls do not affect it.
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// of the pipeline so that stalls do not affect it.
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reg rFINT;
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reg rFINT;
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reg [1:0] rDINT;
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reg [1:0] rDINT;
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//wire wSHOT = rDINT[0] & !rDINT[1] & sys_int_i;
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//wire wSHOT = rDINT[0] & !rDINT[1] & sys_int_i;
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wire wSHOT = !rDINT[0] & sys_int_i;
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//wire wSHOT = !rDINT[0] & sys_int_i;
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wire wSHOT = (rDINT == 2'o1);
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always @(posedge gclk)
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always @(posedge gclk)
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if (grst) begin
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if (grst) begin
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/*AUTORESET*/
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/*AUTORESET*/
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// Beginning of autoreset for uninitialized flops
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// Beginning of autoreset for uninitialized flops
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rDINT <= 2'h0;
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rDINT <= 2'h0;
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rFINT <= 1'h0;
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rFINT <= 1'h0;
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// End of automatics
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// End of automatics
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end else if (rMSR_IE) begin
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end else if (rMSR_IE) begin
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rDINT <= #1 {rDINT[0], sys_int_i};
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rDINT <= #1 {rDINT[0], sys_int_i};
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rFINT <= (wIREG == wINTOP) ? 1'b0 : (rFINT | wSHOT);
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rFINT <= #1 (wIREG == wINTOP) ? 1'b0 : (rFINT | wSHOT);
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end
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end
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wire fIMM = (rOPC == 6'o54);
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wire fIMM = (rOPC == 6'o54);
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wire fRTD = (rOPC == 6'o55);
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wire fRTD = (rOPC == 6'o55);
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wire fBRU = ((rOPC == 6'o46) | (rOPC == 6'o56));
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wire fBRU = ((rOPC == 6'o46) | (rOPC == 6'o56));
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