+++ /dev/null
--- J.STELZNER
--- INFORMATIK-3 LABOR
--- 23.08.2006
--- File: COMM_DEC.VHD
-
-library ieee;
-use ieee.std_logic_1164.all ;
-
-entity COMM_DEC is
- port
- (
- PCI_CLOCK :in std_logic;
- PCI_RSTn :in std_logic;
- MY_ADDR :in std_logic;
- IDSEL_REG :in std_logic;
- FRAME_REGn :in std_logic;
- IO_SPACE :in std_logic;
- AD_REG :in std_logic_vector(31 downto 0);
- CBE_REGn :in std_logic_vector( 3 downto 0);
- LAR :out std_logic;--LOAD_ADDR_REG
- IO_READ :out std_logic;
- IO_WRITE :out std_logic;
- CONF_READ :out std_logic;
- CONF_WRITE :out std_logic;
- SERR_CHECK :out std_logic
- );
-end entity COMM_DEC ;
-
-architecture COMM_DEC_DESIGN of COMM_DEC is
-
-
---PCI Bus Commands
---C/BE[3..0] Command Type
---------------------------------------
--- 0000 Interrupt Acknowledge
--- 0001 Special Cycle
--- 0010 I/O Read
--- 0011 I/O Write
--- 0100 Reserved
--- 0101 Reserved
--- 0110 Memory Read
--- 0111 Memory Write
---
--- 1000 Reserved
--- 1001 Reserved
--- 1010 Configuration Read
--- 1011 Configuration Write
--- 1100 Memory Read Multiple
--- 1101 Dual Address Cycle
--- 1110 Memory Read Line
--- 1111 Memory Write and Invalidate
-
-
---PCI Byte Enable
---C/BE[3..0] gueltige Datenbits
--------------------------------
--- 0000 AD 31..0
--- 1000 AD 23..0
--- 1100 AD 15..0
--- 1110 AD 7..0
-
- constant cmd_int_ack :std_logic_vector(3 downto 0) := "0000";
- constant cmd_sp_cyc :std_logic_vector(3 downto 0) := "0001";
- constant cmd_io_read :std_logic_vector(3 downto 0) := "0010";
- constant cmd_io_write :std_logic_vector(3 downto 0) := "0011";
- constant cmd_res_4 :std_logic_vector(3 downto 0) := "0100";
- constant cmd_res_5 :std_logic_vector(3 downto 0) := "0101";
- constant cmd_mem_read :std_logic_vector(3 downto 0) := "0110";
- constant cmd_mem_write :std_logic_vector(3 downto 0) := "0111";
- constant cmd_res_8 :std_logic_vector(3 downto 0) := "1000";
- constant cmd_res_9 :std_logic_vector(3 downto 0) := "1001";
- constant cmd_conf_read :std_logic_vector(3 downto 0) := "1010";
- constant cmd_conf_write :std_logic_vector(3 downto 0) := "1011";
- constant cmd_mem_read_m :std_logic_vector(3 downto 0) := "1100";
- constant cmd_du_adr_cyc :std_logic_vector(3 downto 0) := "1101";
- constant cmd_mem_read_l :std_logic_vector(3 downto 0) := "1110";
- constant cmd_mem_write_i :std_logic_vector(3 downto 0) := "1111";
-
- signal START :std_logic;
- signal FRAME_REG_REGn :std_logic;
-
- signal SIG_IO_READ :std_logic;
- signal SIG_IO_WRITE :std_logic;
- signal SIG_CONF_READ :std_logic;
- signal SIG_CONF_WRITE :std_logic;
-
-begin
-
- process (PCI_CLOCK, PCI_RSTn)
- begin
- if PCI_RSTn = '0' then FRAME_REG_REGn <= '1';
- elsif (PCI_CLOCK'event and PCI_CLOCK = '1') then
-
- FRAME_REG_REGn <= FRAME_REGn;
-
- end if;
- end process;
-
-
- START <= (not FRAME_REGn) and FRAME_REG_REGn;
-
-
-
- SIG_IO_READ <= '1' when START = '1'
- and IO_SPACE = '1'
- and CBE_REGn = cmd_io_read
- and MY_ADDR = '1'
- else '0';
-
-
- SIG_IO_WRITE <= '1' when START = '1'
- and IO_SPACE = '1'
- and CBE_REGn = cmd_io_write
- and MY_ADDR = '1'
- else '0';
-
-
- SIG_CONF_READ <= '1' when START = '1'
- and AD_REG(1 downto 0) = "00"
- and CBE_REGn = cmd_conf_read
- and IDSEL_REG = '1'
-
- else '0';
-
-
- SIG_CONF_WRITE <= '1' when START = '1'
- and AD_REG(1 downto 0) = "00"
- and CBE_REGn = cmd_conf_write
- and IDSEL_REG = '1'
- else '0';
-
- LAR <= START;
-
- SERR_CHECK <= SIG_IO_READ or SIG_IO_WRITE or SIG_CONF_READ or SIG_CONF_WRITE;
-
- IO_READ <= SIG_IO_READ;
- IO_WRITE <= SIG_IO_WRITE;
- CONF_READ <= SIG_CONF_READ;
- CONF_WRITE <= SIG_CONF_WRITE;
-
-end architecture COMM_DEC_DESIGN ;
projects / raggedstone / blobdiff