?? mx25l4005a.v
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/*----------------------------------------------------------------------------
*
* mx25L4005A.v - 4M-BIT CMOS Serial Flash
*
* COPYRIGHT 2005 BY Macronix International Corporation
*
*-----------------------------------------------------------------------------
* Creation Date: 2005/9/
* Doc : REV.1.0, JUL. 08, 2005
* Note : This model do not include test mode
* Description :
* module flash_4m -> behavior model for the 4M serial flash
*-----------------------------------------------------------------------------
*/
`timescale 1ns / 10ps
// Define controller state
`define STANDBY_STATE 0
`define ACTION_STATE 1
`define CMD_STATE 2
`define BAD_CMD_STATE 3
`define SECTOR_ERASE_TIME 90_000_000 // 90 ms
`define BLOCK_ERASE_TIME 1_000_000_000 // 1 s
`define CHIP_ERASE_TIME 4_500_000_000 // 4.5 s
`define PROG_TIME 1_400_000 // 1.4 ms
// Time delay to write instruction
`define PUW_TIME 10_0//00_000 // 10 ms
`define MX25L4005A //MX25L4005A
`ifdef MX25L4005A
`define FLASH_ADDR 19
`define SECTOR_ADDR 7
`define BLOCK_ADDR 4
`else
`ifdef MX25L8005
`define FLASH_ADDR 20
`define SECTOR_ADDR 8
`define BLOCK_ADDR 4
`endif
`endif
`define FLASH_TYPE 0
module flash_4m( SCLK, CS, SI, SO, WP, HOLD);
//---------------------------------------------------------------------
// Declaration of ports (input,output, inout)
//---------------------------------------------------------------------
input SCLK, // Signal of Clock Input
CS, // Chip select (Low active)
SI, // Serial Data Input
WP, // Write Protection:connect to GND
HOLD; //
output SO; // Serial Data Output
//---------------------------------------------------------------------
// Declaration of parameter (parameter)
//---------------------------------------------------------------------
parameter FLASH_SIZE = 1 << `FLASH_ADDR, // 512K bytes
SECTOR_SIZE = 1 << 12, // 4K bytes
BLOCK_SIZE = 1 << 16, // 64K bytes
tAA = 12, // Access Time [ns],tAA = tSKH + tCLQ
tC = 14, // Clock Cycle Time,tC = tSKH + tSKL
//tSKH = 9, // Clock High Time
//tSKL = 9, // Clock Low Time
tSHQZ = 6, // CS High to SO Float Time [ns]
tCLQV = 1, // Clock Low to Output Valid
tDP = 3_000, // 3 us
tRES1 = 3_000, // 3 us
tRES2 = 1_800, // 1.8 us
tW_SRWD = 15_000_000, // 15 ms
tW_BP = 500_000_000, // 500 ms
tW_WIP = 30_000_000, // 30 ms
tW_WEL = 30_000_000; // 30 ms
parameter [7:0] ID_MXIC = 8'hc2;
`ifdef MX25L4005A
parameter [7:0] ID_Device = 8'h12; // MX25L4005A
`else
`ifdef MX25L8005
parameter [7:0] ID_Device = 8'h13; // MX25L8005
`endif
`endif
parameter [7:0] WREN = 8'h06, //WriteEnable = 8'h06,
WRDI = 8'h04, //WriteDisable = 8'h04,
RDID = 8'h9F, //ReadID = 8'h9f,
RDSR = 8'h05, //ReadStatus = 8'h05,
WRSR = 8'h01, //WriteStatus = 8'h01,
READ = 8'h03, //ReadData = 8'h03,
FASTREAD = 8'h0b, //FastReadData = 8'h0b,
PARALLELMODE = 8'h55, //PallelMode = 8'h55,
SE = 8'h20, //SectorErase = 8'h20
BE = 8'hd8, //BlockErase = 8'hd8
CE1 = 8'h60, //ChipErase = 8'h60,//8'hc7
CE2 = 8'hc7, //ChipErase = 8'h60,//8'hc7
PP = 8'h02, //PageProgram = 8'h02,
DP = 8'hb9, //DeepPowerDown = 8'hb9,
EN4K = 8'ha5, //Enter4kbSector= 8'ha5,
EX4K = 8'hb5, //Exit4kbSector = 8'hb5,
RDP = 8'hab, //ReleaseFromDeepPowerDwon = 8'hab,
RES = 8'hab, //ReadElectricID = 8'hab,
REMS = 8'h90; //ReadElectricManufacturerDeviceID = 90;
//---------------------------------------------------------------------
// Declaration of internal-register (reg)
//---------------------------------------------------------------------
// memory array
reg [7:0] ROM_ARRAY[ 0:FLASH_SIZE-1 ];
reg [7:0] status_reg; // Status Register
reg [256*8-1:0] si_reg; // temp reg to store serial in
reg [23:0] address; //
reg [256*8-1:0] psi_reg; // temp reg to store serial in
reg [256*8-1:0] dummy_A; // page size
reg [12:0] segment_addr; // A[20:8] segment address
reg [7:0] offset_addr; // A[7:0] means 256 bytes
reg [`SECTOR_ADDR - 1:0] sector; // means 128 sectors
reg [2:0] state, rState;
reg ENB_S0,ENB_P0,ENB_S1,ENB_P1;
reg SO_reg;
reg PO_reg6,PO_reg5,PO_reg4,PO_reg3,PO_reg2,PO_reg1,PO_reg0;
reg latch_SO,latch_PO6,latch_PO5,latch_PO4,latch_PO3,latch_PO2,latch_PO1,latch_PO0;
reg pp_p;
reg pmode; // parallel mode
reg dpmode; // deep power down mode
reg enter4kbmode; // enter 4kb mode
reg chip_erase_oe;
integer i,chip_erase_count;
wire wp_reg = WP;
assign SO = pp_p ? 8'bz : SO_reg;
always @(SO) begin
latch_SO = SO;
//latch_PO6 = PO6;
end
/*-------------------------------------------------------*/
/* initial variable value */
/*-------------------------------------------------------*/
initial
begin
pp_p = 1'b0;
enter4kbmode = 1'b0;
dpmode = 1'b0;
pmode = 1'b0;
chip_erase_oe = 1'b0;
chip_erase_count = 0;
status_reg = 8'b0000_0000;
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b1,1'b0,1'b0,1'b0};
i = 0;
end
/*-------------------------------------------------------*/
/* latch signal SI into si_reg */
/*-------------------------------------------------------*/
always @( posedge SCLK ) begin
if ( $time > `PUW_TIME ) begin
if ( CS == 1'b0 ) begin
{ si_reg[ 256*8-1:0 ] } = { si_reg[ 256*8-2:0 ], SI };
end
end
end
/*-------------------------------------------------------*/
/* chip erase process */
/*-------------------------------------------------------*/
always @( posedge chip_erase_oe ) begin
chip_erase_count = 0;
for ( chip_erase_count = 0;chip_erase_count<=`CHIP_ERASE_TIME;chip_erase_count=chip_erase_count+1)
begin
#1000;
end
//WIP : write in process bit
chip_erase_count = 0;
for( chip_erase_count = 0; chip_erase_count < FLASH_SIZE; chip_erase_count = chip_erase_count+1 )
begin
ROM_ARRAY[ chip_erase_count ] <= 8'hff;
end
chip_erase_count = 0;
//WIP : write in process bit
status_reg[0] <= 1'b0;//WIP
//WEL : write enable latch
status_reg[1] <= 1'b0;//WEL
chip_erase_oe = 1'b0;
end
/*-------------------------------------------------------*/
/* Finite state machine to control Flash operation */
/*-------------------------------------------------------*/
always @( posedge SCLK or posedge CS ) begin
if ( CS == 1'b1 ) begin // Chip Disable
state <= #(tC-1) `STANDBY_STATE;
SO_reg <= #tCLQV 1'bz;
end
else begin // Chip Enable
case ( state )
`STANDBY_STATE: begin
SO_reg <= #tCLQV 1'bz;
dummy_cycle( 6 );
state <= #(tC-1) `CMD_STATE;
end
`CMD_STATE: begin
#1;
if ( si_reg[ 7:0 ] == WREN ) begin
//$display( $stime, " Enter Write Enable Function ...");
write_enable;
//$display( $stime, " Leave Write Enable Function ...");
state <= `STANDBY_STATE;
end
else if ( si_reg[ 7:0 ] == WRDI ) begin
//$display( $stime, " Enter Write Disable Function ...");
write_disable;
//$display( $stime, " Leave Write Disable Function ...");
state <= `STANDBY_STATE;
end
else if ( si_reg[ 7:0 ] == RDID ) begin
//$display( $stime, " Enter Read ID Function ...");
read_id;
//$display( $stime, " Leave Read ID Function ...");
state <= `STANDBY_STATE;
end
else if ( si_reg[ 7:0 ] == RDSR ) begin
//$display( $stime, " Enter Read Status Function ...");
read_status ( status_reg );
//$display( $stime, " Leave Read Status Function ...");
state <= `STANDBY_STATE;
end
else if ( si_reg[ 7:0 ] == WRSR ) begin
//$display( $stime, " Enter Write Status Function ...");
write_status;
//$display( $stime, " Leave Write Status Function ...");
state <= `STANDBY_STATE;
end
else if ( si_reg[ 7:0 ] == READ ) begin
//$display( $stime, " Enter Read Data Function ...");
dummy_cycle( 24 ); // to get 24 bits address
read_data;
//$display( $stime, " Leave Read Data Function ...");
state <= `STANDBY_STATE;
end
else if ( si_reg[ 7:0 ] == FASTREAD ) begin
//$display( $stime, " Enter Fast Read Data Function ...");
dummy_cycle( 24 ); // to get 24 bits address
fast_read_data;
//$display( $stime, " Leave Fast Read Data Function ...");
state <= `STANDBY_STATE;
end
//else if ( si_reg[ 7:0 ] == PARALLELMODE ) begin
// //$display( $stime, " Enter Parallel Mode Function ...");
// parallel_mode;
// //$display( $stime, " Leave Parallel Mode Function ...");
// state <= `STANDBY_STATE;
//end
else if ( si_reg[ 7:0 ] == SE ) begin
//$display( $stime, " Enter Sector Erase Function ...");
dummy_cycle( 24 ); // to get 24 bits address
sector_erase;
//$display( $stime, " Leave Sector Erase Function ...");
state <= `STANDBY_STATE;
end
else if ( si_reg[ 7:0 ] == BE ) begin
//$display( $stime, " Enter Block Erase Function ...");
dummy_cycle( 24 ); // to get 24 bits address
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