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//// ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////
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// CVS Log
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// CVS Log
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//
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//
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// $Id: i2c_master_bit_ctrl.v,v 1.9 2003-03-10 14:26:37 rherveille Exp $
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// $Id: i2c_master_bit_ctrl.v,v 1.10 2003-08-09 07:01:33 rherveille Exp $
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//
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//
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// $Date: 2003-03-10 14:26:37 $
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// $Date: 2003-08-09 07:01:33 $
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// $Revision: 1.9 $
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// $Revision: 1.10 $
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// $Author: rherveille $
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// $Author: rherveille $
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// $Locker: $
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// $Locker: $
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// $State: Exp $
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// $State: Exp $
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//
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//
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// Change History:
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// Change History:
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// $Log: not supported by cvs2svn $
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// $Log: not supported by cvs2svn $
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// Revision 1.9 2003/03/10 14:26:37 rherveille
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// Fixed cmd_ack generation item (no bug).
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//
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// Revision 1.8 2003/02/05 00:06:10 rherveille
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// Revision 1.8 2003/02/05 00:06:10 rherveille
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// Fixed a bug where the core would trigger an erroneous 'arbitration lost' interrupt after being reset, when the reset pulse width < 3 clk cycles.
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// Fixed a bug where the core would trigger an erroneous 'arbitration lost' interrupt after being reset, when the reset pulse width < 3 clk cycles.
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//
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//
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// Revision 1.7 2002/12/26 16:05:12 rherveille
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// Revision 1.7 2002/12/26 16:05:12 rherveille
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// Small code simplifications
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// Small code simplifications
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Line 275... |
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// generate arbitration lost signal
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// generate arbitration lost signal
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// aribitration lost when:
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// aribitration lost when:
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// 1) master drives SDA high, but the i2c bus is low
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// 1) master drives SDA high, but the i2c bus is low
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// 2) stop detected while not requested
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// 2) stop detected while not requested
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reg cmd_stop, dcmd_stop;
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reg cmd_stop;
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always @(posedge clk or negedge nReset)
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always @(posedge clk or negedge nReset)
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if (~nReset)
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if (~nReset)
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begin
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cmd_stop <= #1 1'b0;
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cmd_stop <= #1 1'b0;
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dcmd_stop <= #1 1'b0;
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al <= #1 1'b0;
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end
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else if (rst)
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else if (rst)
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begin
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cmd_stop <= #1 1'b0;
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cmd_stop <= #1 1'b0;
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dcmd_stop <= #1 1'b0;
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else if (clk_en)
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cmd_stop <= #1 cmd == `I2C_CMD_STOP;
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always @(posedge clk or negedge nReset)
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if (~nReset)
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al <= #1 1'b0;
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else if (rst)
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al <= #1 1'b0;
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al <= #1 1'b0;
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end
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else
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else
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begin
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al <= #1 (sda_chk & ~sSDA & sda_oen) | (sto_condition & ~cmd_stop);
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cmd_stop <= #1 cmd == `I2C_CMD_STOP;
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dcmd_stop <= #1 cmd_stop;
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al <= #1 (sda_chk & ~sSDA & sda_oen) | (sto_condition & ~dcmd_stop);
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end
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// generate dout signal (store SDA on rising edge of SCL)
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// generate dout signal (store SDA on rising edge of SCL)
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always @(posedge clk)
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always @(posedge clk)
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if(sSCL & ~dSCL)
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if(sSCL & ~dSCL)
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