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[/] [spacewire_light/] [trunk/] [rtl/] [vhdl/] [spwambapkg.vhd] - Blame information for rev 5

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1 5 jorisvr
--
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--  VHDL package for SpaceWire AMBA interface.
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--
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--  This package depends on Gaisler GRLIB.
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--
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library ieee;
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use ieee.std_logic_1164.all;
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library grlib;
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use grlib.amba.all;
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library techmap;
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use techmap.gencomp.all;
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use work.spwpkg.all;
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package spwambapkg is
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    -- AMBA plug&play device id
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    constant DEVICE_SPACEWIRELIGHT: amba_device_type := 16#131#;
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    -- Signals from SpaceWire core to AHB master.
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    type spw_ahbmst_in_type is record
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        -- Pulse high to start the RX DMA engine.
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        rxdma_start:    std_ulogic;
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        -- Pulse high to start the TX DMA engine.
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        txdma_start:    std_ulogic;
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        -- Stop TX DMA engine (at end of current burst).
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        txdma_cancel:   std_ulogic;
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        -- Address of current RX descriptor (8-byte aligned).
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        rxdesc_ptr:     std_logic_vector(31 downto 3);
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        -- Address of current TX descriptor (8-byte aligned).
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        txdesc_ptr:     std_logic_vector(31 downto 3);
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        -- Read port of RX FIFO.
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        rxfifo_rdata:   std_logic_vector(35 downto 0);
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        -- High if RX FIFO is empty.
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        rxfifo_empty:   std_ulogic;
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        -- High if RX FIFO will be empty after one read.
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        -- May combinatorially depend on spw_ahbmst_out_type.rxfifo_read.
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        rxfifo_nxempty: std_ulogic;
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        -- High if TX FIFO is full or has room for at most one word.
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        txfifo_nxfull:  std_ulogic;
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        -- High if TX FIFO is close to full (blocks refill).
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        txfifo_highw:   std_ulogic;
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    end record;
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    -- Signals from AHB master to SpaceWire core.
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    type spw_ahbmst_out_type is record
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        -- High if the RX DMA engine is enabled.
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        rxdma_act:      std_ulogic;
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        -- High if the TX DMA engine is enabled.
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        txdma_act:      std_ulogic;
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        -- High if an error occurred on the AHB bus.
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        ahberror:       std_ulogic;
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        -- Pulsed high to trigger an RX descriptor interrupt.
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        int_rxdesc:     std_ulogic;
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        -- Pulsed high to trigger a TX descriptor interrupt.
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        int_txdesc:     std_ulogic;
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        -- Pulsed high when a complete packet has been received.
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        int_rxpacket:   std_ulogic;
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        -- Pulsed high to request the next RX descriptor address.
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        -- (rxdesc_ptr must be updated in the next clock cycle).
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        rxdesc_next:    std_ulogic;
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        -- Pulsed high together with rxdesc_next to wrap the RX descriptor pointer.
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        rxdesc_wrap:    std_ulogic;
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        -- Pulsed high to request the next TX descriptor address.
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        -- (txdesc_ptr must be updated in the next clock cycle).
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        txdesc_next:    std_ulogic;
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        -- Pulsed high together with txdesc_next to wrap the TX descriptor pointer.
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        txdesc_wrap:    std_ulogic;
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        -- Read strobe to RX fifo.
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        rxfifo_read:    std_ulogic;
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        -- Write enable to TX fifo.
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        txfifo_write:   std_ulogic;
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        -- Input port of TX fifo.
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        txfifo_wdata:   std_logic_vector(35 downto 0);
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    end record;
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    -- SpaceWire core with AMBA interface.
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    component spwamba is
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        generic (
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            tech:           integer range 0 to NTECH := DEFFABTECH;
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            hindex:         integer;                -- AHB master index
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            pindex:         integer;                -- APB slave index
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            paddr:          integer;                -- APB address range
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            pmask:          integer := 16#fff#;     -- APB address mask
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            pirq:           integer;                -- interrupt number
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            sysfreq:        real;                   -- system clock frequency in Hz
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            txclkfreq:      real := 0.0;            -- txclk frequency in Hz
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            rximpl:         spw_implementation_type := impl_generic;
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            rxchunk:        integer range 1 to 4 := 1;
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            tximpl:         spw_implementation_type := impl_generic;
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            timecodegen:    boolean := true;        -- support timecode generation
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            rxfifosize:     integer range 6 to 12 := 8; -- size of receive FIFO (2-log of words)
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            txfifosize:     integer range 2 to 12 := 8; -- size of transmit FIFO (2-log of words)
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            desctablesize:  integer range 4 to 14 := 10; -- size of the DMA descriptor tables (2-log of descriptors)
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            maxburst:       integer range 1 to 8 := 3   -- max burst length (2-log of words)
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        );
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        port (
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            clk:        in  std_logic;              -- system clock.
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            rxclk:      in  std_logic;              -- receiver sample clock
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            txclk:      in  std_logic;              -- transmit clock
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            rstn:       in  std_logic;              -- synchronous reset (active-low)
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            apbi:       in  apb_slv_in_type;        -- APB slave input signals
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            apbo:       out apb_slv_out_type;       -- APB slave output signals
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            ahbi:       in  ahb_mst_in_type;        -- AHB master input signals
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            ahbo:       out ahb_mst_out_type;       -- AHB master output signals
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            tick_in:    in  std_logic;              -- pulse for timecode generation
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            spw_di:     in  std_logic;              -- Data In signal from SpaceWire bus
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            spw_si:     in  std_logic;              -- Strobe In signal from SpaceWire bus
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            spw_do:     out std_logic;              -- Data Out signal to SpaceWire bus
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            spw_so:     out std_logic               -- Strobe Out signal to SpaceWire bus
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        );
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    end component spwamba;
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    -- AHB master for AMBA interface.
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    component spwahbmst is
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        generic (
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            hindex:         integer;                -- AHB master index
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            hconfig:        ahb_config_type;        -- AHB plug&play information
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            maxburst:       integer range 1 to 8    -- 2log of max burst length
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        );
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        port (
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            clk:        in  std_logic;              -- system clock
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            rstn:       in  std_logic;              -- synchronous reset (active-low)
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            msti:       in  spw_ahbmst_in_type;     -- inputs from SpaceWire core
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            msto:       out spw_ahbmst_out_type;    -- outputs to SpaceWire core
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            ahbi:       in  ahb_mst_in_type;        -- AHB master input signals
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            ahbo:       out ahb_mst_out_type        -- AHB master output signals
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        );
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    end component spwahbmst;
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end package;

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