| Line 138... |
Line 138... |
//
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//
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// genpc_freeze_r
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// genpc_freeze_r
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//
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//
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always @(posedge clk or posedge rst)
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always @(posedge clk or posedge rst)
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if (rst)
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if (rst)
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genpc_refetch_r <= #1 1'b0;
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genpc_refetch_r <= 1'b0;
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else if (genpc_refetch)
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else if (genpc_refetch)
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genpc_refetch_r <= #1 1'b1;
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genpc_refetch_r <= 1'b1;
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else
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else
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genpc_refetch_r <= #1 1'b0;
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genpc_refetch_r <= 1'b0;
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//
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//
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// Async calculation of new PC value. This value is used for addressing the
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// Async calculation of new PC value. This value is used for addressing the
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// IC.
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// IC.
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//
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//
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| Line 256... |
Line 256... |
// PC register
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// PC register
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//
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//
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always @(posedge clk or posedge rst)
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always @(posedge clk or posedge rst)
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// default value
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// default value
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if (rst) begin
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if (rst) begin
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pcreg_default <= #1 `OR1200_BOOT_PCREG_DEFAULT; // jb
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pcreg_default <= `OR1200_BOOT_PCREG_DEFAULT; // jb
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pcreg_select <= #1 1'b1;// select async. value due to reset state
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pcreg_select <= 1'b1;// select async. value due to reset state
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end
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end
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// selected value (different from default) is written into FF after
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// selected value (different from default) is written into FF after
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// reset state
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// reset state
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else if (pcreg_select) begin
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else if (pcreg_select) begin
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// dynamic value can only be assigned to FF out of reset!
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// dynamic value can only be assigned to FF out of reset!
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pcreg_default <= #1 pcreg_boot[31:2];
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pcreg_default <= pcreg_boot[31:2];
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pcreg_select <= #1 1'b0; // select FF value
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pcreg_select <= 1'b0; // select FF value
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end
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end
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else if (spr_pc_we) begin
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else if (spr_pc_we) begin
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pcreg_default <= #1 spr_dat_i[31:2];
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pcreg_default <= spr_dat_i[31:2];
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end
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end
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else if (no_more_dslot | except_start | !genpc_freeze & !icpu_rty_i
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else if (no_more_dslot | except_start | !genpc_freeze & !icpu_rty_i
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& !genpc_refetch) begin
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& !genpc_refetch) begin
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pcreg_default <= #1 pc[31:2];
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pcreg_default <= pc[31:2];
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end
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end
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// select async. value for pcreg after reset - PC jumps to the address selected
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// select async. value for pcreg after reset - PC jumps to the address selected
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// after boot.
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// after boot.
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assign pcreg_boot = `OR1200_BOOT_ADR; // changed JB
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assign pcreg_boot = `OR1200_BOOT_ADR; // changed JB
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