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[/] [neorv32/] [trunk/] [rtl/] [core/] [neorv32_cpu_bus.vhd] - Diff between revs 16 and 17
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| Rev 16 |
Rev 17 |
| Line 411... |
Line 411... |
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-- Physical Memory Protection (PMP) -------------------------------------------------------
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-- Physical Memory Protection (PMP) -------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- compute address masks --
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-- compute address masks --
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pmp_masks: process(pmp_addr_i)
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pmp_masks: process(clk_i)
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begin
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begin
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if rising_edge(clk_i) then -- address configuration (not the actual address check!) has a latency of +1 cycles
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for r in 0 to PMP_NUM_REGIONS-1 loop -- iterate over all regions
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for r in 0 to PMP_NUM_REGIONS-1 loop -- iterate over all regions
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pmp.addr_mask(r) <= (others => '0'); -- default
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pmp.addr_mask(r) <= (others => '0'); -- default
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for i in PMP_GRANULARITY+1 to 33 loop
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for i in PMP_GRANULARITY+1 to 33 loop
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if (i = PMP_GRANULARITY+1) then
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if (i = PMP_GRANULARITY+1) then
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pmp.addr_mask(r)(i) <= '0';
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pmp.addr_mask(r)(i) <= '0';
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else -- current bit = not AND(all previous bits)
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else -- current bit = not AND(all previous bits)
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pmp.addr_mask(r)(i) <= not (and_all_f(pmp_addr_i(r)(i-1 downto PMP_GRANULARITY)));
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pmp.addr_mask(r)(i) <= not (and_all_f(pmp_addr_i(r)(i-1 downto PMP_GRANULARITY)));
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end if;
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end if;
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end loop; -- i
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end loop; -- i
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end loop; -- r
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end loop; -- r
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end if;
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end process pmp_masks;
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end process pmp_masks;
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-- compute operands for comparator --
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-- compute operands for comparator --
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pmp_prepare_check:
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pmp_prepare_check:
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