📄 mx25l512.v
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if (pmode == 0) begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b1,1'b0,1'b0,1'b0};
end
else begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b0,1'b1,1'b0,1'b0};
end
if(wp_reg==1'b0||status_reg[7]==1'b1) begin
// Protected Mode
end
else if(dpmode == 1'b1) begin
// deep power down mode
end
else begin
if ( protected_area({block[`BLOCK_ADDR - 1:0],4'b0}) == 1'b1) begin
end
else if ( 16 <= block && block <=31 && bp2==1'b1 && bp1==1'b0 && bp0 ==1'b1) begin
end
else begin
//WIP : write in process bit
status_reg[0] = 1'b1;
for( i = start_addr; i < (end_addr+1); i = i + 1 )
begin
ROM_ARRAY[ i ] <= #`BLOCK_ERASE_TIME 8'hff;
end
//WIP : write in process bit
status_reg[0] <= #`BLOCK_ERASE_TIME 1'b0;//WIP
//WEL : write enable latch
status_reg[1] <= #`BLOCK_ERASE_TIME 1'b0;//WEL
end
end
end
disable block_erase;
end
end // end forever
end
endtask
/*---------------------------------------------------------------*/
/* Description: define a sector erase task */
/* 20(D8) AD1 AD2 AD3 */
/*---------------------------------------------------------------*/
task sector_erase;
reg [`SECTOR_ADDR - 1:0] sector;
reg [15:0] offset; // 64K Byte
reg [`FLASH_ADDR - 1:0] rom_addr;
integer i, start_addr,end_addr,start_4kb_addr,end_4kb_addr;
reg bp0;
reg bp1;
reg bp2;
reg bp3;
begin
sector[`SECTOR_ADDR - 1:0] = si_reg[19:12];
offset = 12'h0;
start_addr = (si_reg[19:12]<<12) + 12'h000;
end_addr = (si_reg[19:12]<<12) + 12'hfff;
start_4kb_addr = 9'h000;
end_4kb_addr = 9'h1ff;
if ( dpmode == 1'b0) begin //do work on non deep power down mode
if (pmode == 0) begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b1,1'b0,1'b0,1'b0};
end
else begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b0,1'b1,1'b0,1'b0};
end
end
forever begin
@( posedge CS );
if( CS == 1'b1 ) begin
if ( dpmode == 1'b0) begin //do work on non deep power down mode
if (pmode == 0) begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b1,1'b0,1'b0,1'b0};
end
else begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b0,1'b1,1'b0,1'b0};
end
if(wp_reg==1'b0||status_reg[7]==1'b1) begin
// Protected Mode
end
else if(dpmode == 1'b1) begin
// deep power down mode
end
else begin
if ( protected_area(sector[`SECTOR_ADDR - 1:0]) == 1'b1) begin
end
else if ( 16 <= sector && sector <=31 && bp2==1'b1 && bp1==1'b0 && bp0 ==1'b1) begin
end
else begin
//WIP : write in process bit
status_reg[0] = 1'b1;
for( i = start_addr; i < (end_addr+1); i = i + 1 )
begin
ROM_ARRAY[ i ] <= #`SECTOR_ERASE_TIME 8'hff;
end
//WIP : write in process bit
status_reg[0] <= #`SECTOR_ERASE_TIME 1'b0;//WIP
//WEL : write enable latch
status_reg[1] <= #`SECTOR_ERASE_TIME 1'b0;//WEL
end
end
end
disable sector_erase;
end
end // end forever
end
endtask
/*---------------------------------------------------------------*/
/* Description: define a chip erase task */
/* 60(C7) */
/*---------------------------------------------------------------*/
task chip_erase;
integer i;
begin
forever begin
@( posedge CS );
if( CS == 1'b1 ) begin
if ( dpmode == 1'b0 ) begin // do work on non deep power down mode
if ( wp_reg !=1'b0 && status_reg[7]!=1'b1 ) begin// protected mode
if ( status_reg[1] == 1'b1 ) begin //WEL:Write Enable Latch
if ( status_reg[2] == 1'b0 && status_reg[3] == 1'b0 && status_reg[3] == 1'b0 ) begin
// WIP : write in process bit
chip_erase_oe = 1'b1;
status_reg[0] <= 1'b1;
//for( i = 0; i < FLASH_SIZE; i = i+1 )
//begin
// ROM_ARRAY[ i ] <= #`CHIP_ERASE_TIME 8'hff;
//end
////WIP : write in process bit
//status_reg[0] <= #`CHIP_ERASE_TIME 1'b0;//WIP
////WEL : write enable latch
//status_reg[1] <= #`CHIP_ERASE_TIME 1'b0;//WEL
end
end
end
end
disable chip_erase;
end // CS == 1'b1
end // end forever
end
endtask
/*---------------------------------------------------------------*/
/* Description: define a page program task */
/* 02 AD1 AD2 AD3 */
/*---------------------------------------------------------------*/
task page_program;
input [12:0] segment;
input [7:0] offset;
reg [`FLASH_ADDR - 1:0] rom_addr; // rom_addr = {segment, offset}
integer dummy_count, tmp_int, i;
begin
dummy_count = 256; // page size
offset[7:0] = 8'h00; // the start address of the page
rom_addr[`FLASH_ADDR - 1:0] = { segment[ 12:0 ],offset[7:0] };
/*------------------------------------------------*/
/* Store 256 bytes into a temp buffer - dummy_A */
/*------------------------------------------------*/
while ( dummy_count ) begin
rom_addr[`FLASH_ADDR - 1:0 ] = { segment[ 12:0 ], offset[ 7:0 ] };
dummy_count = dummy_count - 1;
tmp_int = dummy_count << 3; /* transfer byte to bit */
{ dummy_A[ tmp_int+7 ], dummy_A[ tmp_int+6 ],
dummy_A[ tmp_int+5 ], dummy_A[ tmp_int+4 ],
dummy_A[ tmp_int+3 ], dummy_A[ tmp_int+2 ],
dummy_A[ tmp_int+1 ], dummy_A[ tmp_int ] } =
ROM_ARRAY[ rom_addr ];
offset = offset + 1;
end
tmp_int = 0;
sector[`SECTOR_ADDR - 1:0] = rom_addr[`FLASH_ADDR - 1:12];
address[23:0] = si_reg[23:0];
if (pmode == 0) begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b1,1'b0,1'b0,1'b0};
end
else begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b0,1'b1,1'b0,1'b0};
pp_p = #100 1'b1;
end
forever begin
@( posedge SCLK or posedge CS );
if ( CS == 1'b1 ) begin
if ( dpmode == 1'b0 ) begin // do work on non deep power down mode
if ( status_reg[0] == 1'b0 ) begin //WIP
if ( wp_reg !=1'b0 && status_reg[7]!=1'b1 ) begin// protected mode
if ( status_reg[1] == 1'b1 ) begin //WEL:Write Enable Latch
if ( protected_area(sector[`SECTOR_ADDR - 1:0]) == 1'b0 ) begin // check protected area (3)
//$display( $stime, " Total write %d bits", tmp_int );
if ( pmode == 1'b0 ) begin
for( i = 1; i <= tmp_int; i=i+1 ) begin
if( dummy_A[ 256*8-i ] == 1'b1 ) begin // 1 -> 1 ,1 -> 0
dummy_A[ 256*8-i ] = si_reg[ tmp_int-i ];
end
end
end
else begin
for( i = 1; i <= tmp_int; i=i+1 ) begin
if( dummy_A[ 256*8-i ] == 1'b1 ) begin // 1 -> 1 ,1 -> 0
dummy_A[ 256*8-i ] = psi_reg[ tmp_int-i ];
end
end
// for( i = 1; i <= tmp_int; i=i+8 ) begin
// if( dummy_A[ 256*8-i-0 ] == 1'b1 ) begin
// dummy_A[ 256*8-i-0 ] = psi_reg[ tmp_int-i-0 ];
// end
// if( dummy_A[ 256*8-i-1 ] == 1'b1 ) begin
// dummy_A[ 256*8-i-1 ] = psi_reg[ tmp_int-i-1 ];
// end
// if( dummy_A[ 256*8-i-2 ] == 1'b1 ) begin
// dummy_A[ 256*8-i-2 ] = psi_reg[ tmp_int-i-2 ];
// end
// if( dummy_A[ 256*8-i-3 ] == 1'b1 ) begin
// dummy_A[ 256*8-i-3 ] = psi_reg[ tmp_int-i-3 ];
// end
// if( dummy_A[ 256*8-i-4 ] == 1'b1 ) begin
// dummy_A[ 256*8-i-4 ] = psi_reg[ tmp_int-i-4 ];
// end
// if( dummy_A[ 256*8-i-5 ] == 1'b1 ) begin
// dummy_A[ 256*8-i-5 ] = psi_reg[ tmp_int-i-5 ];
// end
// if( dummy_A[ 256*8-i-6 ] == 1'b1 ) begin
// dummy_A[ 256*8-i-6 ] = psi_reg[ tmp_int-i-6 ];
// end
// if( dummy_A[ 256*8-i-7 ] == 1'b1 ) begin
// dummy_A[ 256*8-i-7 ] = psi_reg[ tmp_int-i-7 ];
// end
// end
end
end
end
end
if (pmode == 0) begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b1,1'b0,1'b0,1'b0};
end
else begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b0,1'b1,1'b0,1'b0};
end
end
end
pp_p = #90 1'b0;
disable page_program;
end
else if (status_reg[0] == 1'b0)begin // count how many bits been shifted
if ( dpmode == 1'b0 ) begin // do work on non deep power down mode
if ( pmode == 1'b0 ) begin
tmp_int = tmp_int + 1;
end
else begin
{ psi_reg[ 256*8-1:0 ] } = { psi_reg[ 256*8-2:0 ],latch_SO};
tmp_int = tmp_int + 8;
end
end
end
end // end forever
end
endtask
/*---------------------------------------------------------------*/
/* Description: define a deep power down (DP) */
/*---------------------------------------------------------------*/
task deep_power_down;
begin
//$display( $stime, " Old DP Mode Register = %b", dpmode );
if (pmode == 0) begin
{ENB_S0,ENB_P0,ENB_S1,ENB_P1} = {1'b1,1'b0,1'b0,1'b0};
end
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