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LIBRARY ieee ;
USE ieee.std_logic_1164. ALL ;
USE ieee.numeric_std. ALL ;
LIBRARY grlib ;
USE grlib.amba. ALL ;
USE grlib.stdlib. ALL ;
USE grlib.devices. ALL ;
USE GRLIB.DMA2AHB_Package. ALL ;
LIBRARY lpp ;
USE lpp.lpp_amba. ALL ;
USE lpp.apb_devices_list. ALL ;
USE lpp.lpp_memory. ALL ;
LIBRARY techmap ;
USE techmap.gencomp. ALL ;
ENTITY lpp_dma_send_1word IS
PORT (
-- AMBA AHB system signals
HCLK : IN STD_ULOGIC ;
HRESETn : IN STD_ULOGIC ;
-- DMA
DMAIn : OUT DMA_In_Type ;
DMAOut : IN DMA_OUt_Type ;
--
send : IN STD_LOGIC ;
address : IN STD_LOGIC_VECTOR ( 31 DOWNTO 0 );
data : IN STD_LOGIC_VECTOR ( 31 DOWNTO 0 );
--
send_ok : OUT STD_LOGIC ;
send_ko : OUT STD_LOGIC
);
END lpp_dma_send_1word ;
ARCHITECTURE beh OF lpp_dma_send_1word IS
TYPE state_fsm_send_1word IS ( IDLE , REQUEST_BUS , SEND_DATA , ERROR0 , ERROR1 );
SIGNAL state : state_fsm_send_1word ;
BEGIN -- beh
DMAIn . Reset <= '0' ;
DMAIn . Address <= address ;
DMAIn . Data <= data ;
DMAIn . Beat <= ( OTHERS => '0' );
DMAIn . Size <= HSIZE32 ;
DMAIn . Burst <= '0' ;
PROCESS ( HCLK , HRESETn )
BEGIN -- PROCESS
IF HRESETn = '0' THEN -- asynchronous reset (active low)
state <= IDLE ;
DMAIn . Request <= '0' ;
DMAIn . Store <= '0' ;
send_ok <= '0' ;
send_ko <= '0' ;
DMAIn . Lock <= '0' ;
ELSIF HCLK 'EVENT AND HCLK = '1' THEN -- rising clock edge
CASE state IS
WHEN IDLE =>
DMAIn . Store <= '1' ;
DMAIn . Request <= '0' ;
send_ok <= '0' ;
send_ko <= '0' ;
DMAIn . Lock <= '0' ;
IF send = '1' THEN
DMAIn . Request <= '1' ;
DMAIn . Lock <= '1' ;
state <= REQUEST_BUS ;
END IF ;
WHEN REQUEST_BUS =>
IF DMAOut . Grant = '1' THEN
DMAIn . Request <= '0' ;
DMAIn . Store <= '0' ;
state <= SEND_DATA ;
END IF ;
WHEN SEND_DATA =>
IF DMAOut . Fault = '1' THEN
DMAIn . Request <= '0' ;
DMAIn . Store <= '0' ;
state <= ERROR0 ;
ELSIF DMAOut . Ready = '1' THEN
DMAIn . Request <= '0' ;
DMAIn . Store <= '0' ;
send_ok <= '1' ;
send_ko <= '0' ;
state <= IDLE ;
END IF ;
WHEN ERROR0 =>
state <= ERROR1 ;
WHEN ERROR1 =>
send_ok <= '0' ;
send_ko <= '1' ;
state <= IDLE ;
WHEN OTHERS => NULL ;
END CASE ;
END IF ;
END PROCESS ;
END beh ;
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