| Line 101... |
Line 101... |
-- Write Access ---------------------------------------------------------------------------
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-- Write Access ---------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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wr_access: process(clk_i)
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wr_access: process(clk_i)
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begin
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begin
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if rising_edge(clk_i) then
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if rising_edge(clk_i) then
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-- mtimecmp --
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-- mtimecmp low --
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if (wren = '1') then
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if (wren = '1') and (addr = mtime_cmp_lo_addr_c) then
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if (addr = mtime_cmp_lo_addr_c) then -- low
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mtimecmp_lo <= data_i;
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mtimecmp_lo <= data_i;
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end if;
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end if;
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if (addr = mtime_cmp_hi_addr_c) then -- high
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-- mtimecmp high --
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if (wren = '1') and (addr = mtime_cmp_hi_addr_c) then
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mtimecmp_hi <= data_i;
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mtimecmp_hi <= data_i;
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end if;
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end if;
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end if;
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-- mtime low --
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-- mtime low --
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if (wren = '1') and (addr = mtime_time_lo_addr_c) then
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if (wren = '1') and (addr = mtime_time_lo_addr_c) then
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mtime_lo_msb_ff <= '0';
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mtime_lo_msb_ff <= '0';
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mtime_lo <= '0' & data_i;
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mtime_lo <= '0' & data_i;
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| Line 138... |
Line 138... |
begin
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begin
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if rising_edge(clk_i) then
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if rising_edge(clk_i) then
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ack_o <= acc_en and (rden_i or wren_i);
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ack_o <= acc_en and (rden_i or wren_i);
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data_o <= (others => '0'); -- default
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data_o <= (others => '0'); -- default
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if (rden_i = '1') and (acc_en = '1') then
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if (rden_i = '1') and (acc_en = '1') then
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if (addr = mtime_time_lo_addr_c) then -- mtime LOW
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case addr is
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when mtime_time_lo_addr_c => -- mtime LOW
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data_o <= mtime_lo(31 downto 00);
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data_o <= mtime_lo(31 downto 00);
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elsif (addr = mtime_time_hi_addr_c) then -- mtime HIGH
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when mtime_time_hi_addr_c => -- mtime HIGH
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data_o <= mtime_hi;
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data_o <= mtime_hi;
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elsif (addr = mtime_cmp_lo_addr_c) then -- mtimecmp LOW
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when mtime_cmp_lo_addr_c => -- mtimecmp LOW
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data_o <= mtimecmp_lo;
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data_o <= mtimecmp_lo;
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else -- (addr = mtime_cmp_hi_addr_c) then -- mtimecmp HIGH
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when mtime_cmp_hi_addr_c => -- mtimecmp HIGH
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data_o <= mtimecmp_hi;
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data_o <= mtimecmp_hi;
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end if;
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when others =>
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data_o <= (others => '0');
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end case;
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end if;
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end if;
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end if;
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end if;
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end process rd_access;
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end process rd_access;
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|
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-- time output for cpu --
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-- time output for cpu --
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