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