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Rev 358 |
Line 147... |
Line 147... |
assign sel_sb = sb_en_reg & (~fifo_empty | (fifo_empty & outstanding_store));
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assign sel_sb = sb_en_reg & (~fifo_empty | (fifo_empty & outstanding_store));
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//
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//
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// SB enable
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// SB enable
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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 `OR1200_RST_EVENT rst)
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if (rst)
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if (rst == `OR1200_RST_VALUE)
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sb_en_reg <= 1'b0;
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sb_en_reg <= 1'b0;
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else if (sb_en & ~dcsb_cyc_i)
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else if (sb_en & ~dcsb_cyc_i)
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sb_en_reg <= 1'b1; // enable SB when there is no dcsb transfer in progress
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sb_en_reg <= 1'b1; // enable SB when there is no dcsb transfer in progress
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else if (~sb_en & (~fifo_empty | (fifo_empty & outstanding_store)))
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else if (~sb_en & (~fifo_empty | (fifo_empty & outstanding_store)))
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sb_en_reg <= 1'b0; // disable SB when there is no pending transfers from SB
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sb_en_reg <= 1'b0; // disable SB when there is no pending transfers from SB
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Line 172... |
Line 172... |
);
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);
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//
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//
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// fifo_rd
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// fifo_rd
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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 `OR1200_RST_EVENT rst)
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if (rst)
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if (rst == `OR1200_RST_VALUE)
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outstanding_store <= 1'b0;
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outstanding_store <= 1'b0;
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else if (sbbiu_ack_i)
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else if (sbbiu_ack_i)
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outstanding_store <= 1'b0;
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outstanding_store <= 1'b0;
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else if (sel_sb | fifo_wr)
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else if (sel_sb | fifo_wr)
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outstanding_store <= 1'b1;
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outstanding_store <= 1'b1;
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//
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//
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// fifo_wr_ack
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// fifo_wr_ack
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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 `OR1200_RST_EVENT rst)
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if (rst)
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if (rst == `OR1200_RST_VALUE)
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fifo_wr_ack <= 1'b0;
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fifo_wr_ack <= 1'b0;
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else if (fifo_wr)
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else if (fifo_wr)
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fifo_wr_ack <= 1'b1;
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fifo_wr_ack <= 1'b1;
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else
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else
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fifo_wr_ack <= 1'b0;
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fifo_wr_ack <= 1'b0;
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