---------------------------------------------------------------------- ---- ---- ---- WF5380 IP Core ---- ---- ---- ---- Description: ---- ---- This model provides an asynchronous SCSI interface compa- ---- ---- tible to the DP5380 from National Semiconductor and others. ---- ---- ---- ---- Some remarks to the required input clock: ---- ---- This core is provided for a 16MHz input clock. To use other ---- ---- frequencies, it is necessary to modify the following proces- ---- ---- ses in the control file section: ---- ---- P_BUSFREE, DELAY_800, INTERRUPTS. ---- ---- ---- ---- This file is the top level file without tree state buses for ---- ---- use in 'systems on chip' designs. ---- ---- ---- ---- ---- ---- Author(s): ---- ---- - Wolfgang Foerster, wf@experiment-s.de; wf@inventronik.de ---- ---- ---- ---------------------------------------------------------------------- ---- ---- ---- Copyright (C) 2009 Wolfgang Foerster ---- ---- ---- ---- This source file may be used and distributed without ---- ---- restriction provided that this copyright statement is not ---- ---- removed from the file and that any derivative work contains ---- ---- the original copyright notice and the associated disclaimer. ---- ---- ---- ---- This source file is free software; you can redistribute it ---- ---- and/or modify it under the terms of the GNU Lesser General ---- ---- Public License as published by the Free Software Foundation; ---- ---- either version 2.1 of the License, or (at your option) any ---- ---- later version. ---- ---- ---- ---- This source is distributed in the hope that it will be ---- ---- useful, but WITHOUT ANY WARRANTY; without even the implied ---- ---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ---- ---- PURPOSE. See the GNU Lesser General Public License for more ---- ---- details. ---- ---- ---- ---- You should have received a copy of the GNU Lesser General ---- ---- Public License along with this source; if not, download it ---- ---- from http://www.gnu.org/licenses/lgpl.html ---- ---- ---- ---------------------------------------------------------------------- -- -- Revision History -- -- Revision 2K9A 2009/06/20 WF -- Initial Release. -- library work; use work.wf5380_pkg.all; library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity WF5380_TOP_SOC is port ( -- System controls: CLK : in bit; -- Use a 16MHz Clock. RESETn : in bit; -- Address and data: ADR : in bit_vector(2 downto 0); DATA_IN : in bit_vector(7 downto 0); DATA_OUT : out bit_vector(7 downto 0); DATA_EN : out bit; -- Bus and DMA controls: CSn : in bit; RDn : in bit; WRn : in bit; EOPn : in bit; DACKn : in bit; DRQ : out bit; INT : out bit; READY : out bit; -- SCSI bus: DB_INn : in bit_vector(7 downto 0); DB_OUTn : out bit_vector(7 downto 0); DB_EN : out bit; DBP_INn : in bit; DBP_OUTn : out bit; DBP_EN : out bit; RST_INn : in bit; RST_OUTn : out bit; RST_EN : out bit; BSY_INn : in bit; BSY_OUTn : out bit; BSY_EN : out bit; SEL_INn : in bit; SEL_OUTn : out bit; SEL_EN : out bit; ACK_INn : in bit; ACK_OUTn : out bit; ACK_EN : out bit; ATN_INn : in bit; ATN_OUTn : out bit; ATN_EN : out bit; REQ_INn : in bit; REQ_OUTn : out bit; REQ_EN : out bit; IOn_IN : in bit; IOn_OUT : out bit; IO_EN : out bit; CDn_IN : in bit; CDn_OUT : out bit; CD_EN : out bit; MSG_INn : in bit; MSG_OUTn : out bit; MSG_EN : out bit ); end entity WF5380_TOP_SOC; architecture STRUCTURE of WF5380_TOP_SOC is signal ACK_OUT_CTRLn : bit; signal AIP : bit; signal ARB : bit; signal ARB_EN : bit; signal BLK : bit; signal BSR : bit_vector(7 downto 0); signal BSY_DISn : bit; signal BSY_ERR : bit; signal BSY_OUT_CTRLn : bit; signal CHK_PAR : bit; signal CSD : bit_vector(7 downto 0); signal CSB : bit_vector(7 downto 0); signal DATA_EN_CTRL : bit; signal DB_EN_I : bit; signal DMA_ACTIVE : bit; signal DMA_EN : bit; signal DMA_DIS : bit; signal DMA_SND : bit; signal DRQ_I : bit; signal EDMA : bit; signal EOP_EN : bit; signal ICR : bit_vector(7 downto 0); signal IDR_WR : bit; signal INT_I : bit; signal LA : bit; signal ODR : bit_vector(7 downto 0); signal ODR_WR : bit; signal PCHK : bit; signal PHSM : bit; signal PINT_EN : bit; signal REQ_OUT_CTRLn : bit; signal RPI : bit; signal RST : bit; signal SDI : bit; signal SDS : bit; signal SDT : bit; signal SER : bit_vector(7 downto 0); signal SER_ID : bit; signal SPER : bit; signal TARG : bit; signal TCR : bit_vector(3 downto 0); begin EDMA <= '1' when EOPn = '0' and DACKn = '0' and RDn = '0' else '1' when EOPn = '0' and DACKn = '0' and WRn = '0' else '0'; PHSM <= '1' when DMA_ACTIVE = '0' else -- Always true, if there is no DMA. '1' when DMA_ACTIVE = '1' and REQ_INn = '0' and CDn_In = TCR(1) and IOn_IN = TCR(0) and MSG_INn = TCR(2) else '0'; -- Phasematch. DMA_DIS <= '1' when DMA_ACTIVE = '1' and BSY_INn = '1' else '0'; SER_ID <= '1' when SER /= x"00" and SER = not CSD else '0'; DRQ <= DRQ_I; INT <= INT_I; -- Pay attention: the SCSI bus is driven with inverted signals. ACK_OUTn <= ACK_OUT_CTRLn when DMA_ACTIVE = '1' else not ICR(4); -- Valid in initiator mode. REQ_OUTn <= REQ_OUT_CTRLn when DMA_ACTIVE = '1' else not TCR(3); -- Valid in Target mode. BSY_OUTn <= '0' when BSY_OUT_CTRLn = '0' and TARG = '0' else -- Valid in initiator mode. '0' when ICR(3) = '1' else '1'; ATN_OUTn <= not ICR(1); -- Valid in initiator mode. SEL_OUTn <= not ICR(2); -- Valid in initiator mode. IOn_OUT <= not TCR(0); -- Valid in Target mode. CDn_OUT <= not TCR(1); -- Valid in Target mode. MSG_OUTn <= not TCR(2); -- Valid in Target mode. RST_OUTn <= not RST; DB_OUTn <= not ODR; DBP_OUTn <= not SPER; CSD <= not DB_INn; CSB <= not RST_INn & not BSY_INn & not REQ_INn & not MSG_INn & not CDn_IN & not IOn_IN & not SEL_INn & not DBP_INn; BSR <= EDMA & DRQ_I & SPER & INT_I & PHSM & BSY_ERR & not ATN_INn & not ACK_INn; -- Hi impedance control: ATN_EN <= '1' when TARG = '0' else '0'; -- Initiator mode. SEL_EN <= '1' when TARG = '0' else '0'; -- Initiator mode. BSY_EN <= '1' when TARG = '0' else '0'; -- Initiator mode. ACK_EN <= '1' when TARG = '0' else '0'; -- Initiator mode. IO_EN <= '1' when TARG = '1' else '0'; -- Target mode. CD_EN <= '1' when TARG = '1' else '0'; -- Target mode. MSG_EN <= '1' when TARG = '1' else '0'; -- Target mode. REQ_EN <= '1' when TARG = '1' else '0'; -- Target mode. RST_EN <= '1' when RST = '1' else '0'; -- Open drain control. -- Data enables: DB_EN_I <= '1' when DATA_EN_CTRL = '1' else -- During Arbitration. '1' when ICR(0) = '1' and TARG = '1' and DMA_SND = '1' else -- Target 'Send' mode. '1' when ICR(0) = '1' and TARG = '0' and IOn_IN = '0' and PHSM = '1' else '1' when ICR(6) = '1' else '0'; -- Test mode enable. DB_EN <= DB_EN_I; DBP_EN <= DB_EN_I; I_REGISTERS: WF5380_REGISTERS port map( CLK => CLK, RESETn => RESETn, ADR => ADR, DATA_IN => DATA_IN, DATA_OUT => DATA_OUT, DATA_EN => DATA_EN, CSn => CSn, RDn => RDn, WRn => WRn, RSTn => RST_INn, RST => RST, ARB_EN => ARB_EN, DMA_ACTIVE => DMA_ACTIVE, DMA_EN => DMA_EN, BSY_DISn => BSY_DISn, EOP_EN => EOP_EN, PINT_EN => PINT_EN, SPER => SPER, TARG => TARG, BLK => BLK, DMA_DIS => DMA_DIS, IDR_WR => IDR_WR, ODR_WR => ODR_WR, CHK_PAR => CHK_PAR, AIP => AIP, ARB => ARB, LA => LA, CSD => CSD, CSB => CSB, BSR => BSR, ODR_OUT => ODR, ICR_OUT => ICR, TCR_OUT => TCR, SER_OUT => SER, SDS => SDS, SDT => SDT, SDI => SDI, RPI => RPI ); I_CONTROL: WF5380_CONTROL port map( CLK => CLK, RESETn => RESETn, BSY_INn => BSY_INn, BSY_OUTn => BSY_OUT_CTRLn, DATA_EN => DATA_EN_CTRL, SEL_INn => SEL_INn, ARB_EN => ARB_EN, BSY_DISn => BSY_DISn, RSTn => RST_INn, ARB => ARB, AIP => AIP, LA => LA, ACK_INn => ACK_INn, ACK_OUTn => ACK_OUT_CTRLn, REQ_INn => REQ_INn, REQ_OUTn => REQ_OUT_CTRLn, DACKn => DACKn, READY => READY, DRQ => DRQ_I, TARG => TARG, BLK => BLK, PINT_EN => PINT_EN, SPER => SPER, SER_ID => SER_ID, RPI => RPI, DMA_EN => DMA_EN, SDS => SDS, SDT => SDT, SDI => SDI, EOP_EN => EOP_EN, EOPn => EOPn, PHSM => PHSM, INT => INT_I, IDR_WR => IDR_WR, ODR_WR => ODR_WR, CHK_PAR => CHK_PAR, BSY_ERR => BSY_ERR, DMA_SND => DMA_SND, DMA_ACTIVE => DMA_ACTIVE ); end STRUCTURE;