I dont wont to save the "space" in SRAM, Help me ?

Altera_Forum · ‎12-13-2009

Hi every body ...

i wrote a code that receive data RS232 and save it on the SRAM ... and its work http://www.edaboard.com/images/smiles/icon_smile.gif

But i have problem...

i don't wont to save a " space " ,which equal 20 in hex, with the data ...i tried to modify my code but i failed

i dont know what is wrong with my code ?? :/

when i send the data like ( for example) >>>1 then 2 then "space" then 3 then 4

the data saved like this in SRAM >>>> 1 then 2 then "space" then 4

i dont know why it save the "space" and skip 3 >>????

this is my whole project :

# ##########################################

module serialfun(clk, RxD, RxD_data, nWR,nCE,

nRD,Address, Data_Bus,LED,Data_In,nUB,nLB,RxD_endofpacket,RxD_data_ready,RxD_idle,WE);

input clk;

input RxD;

output RxD_idle;

output RxD_endofpacket;

output RxD_data_ready;

output nRD;

output nWR, nCE;

output reg WE;

output [17:0] Address;

inout [7:0] Data_Bus;

output [17:0] LED;

output nUB,nLB;

///////////////////////////////////////////////////

//wire RxD_data_ready;

output [7:0] RxD_data;

async_receiver deserializer(.clk(clk), .RxD(RxD), .RxD_data(RxD_data), .RxD_endofpacket(RxD_endofpacket),.RxD_idle(RxD_idle),.RxD_data_ready(RxD_data_ready) );

///////////////////////////////////////////////////

always @(posedge RxD_endofpacket)

if(RxD_endofpacket==1)

begin

if ( RxD_data == 8'b00100000)

WE=1'b0;

else

WE=1'b1;

end

///////////////////////////////////////////////////////////

//assign Data_Bus = WE? RxD_data : 8'hzz;

input [7:0] Data_In;

reg [17:0] Address_In ;

///////////////////////////////////////////////////////////

MEM_SRAM u0(.Data_Bus(Data_Bus), .Address(Address), .nRD(nRD), .nUB(nUB), .nLB(nLB),

.nWR(nWR), .nCE(nCE), .Address_In(Address_In), .Data_In(RxD_data),.LEDR(LED),.RxD_endofpacket(RxD_endofpacket),.WE(WE));

endmodule

# #############################################

module MEM_SRAM (

Data_Bus, // Data Bus

Address, // RAM Address

nRD, // RAM Read Enable

nWR, // RAM Write Enable

nCE, // RAM Chip Enable

nUB, // RAM Upper Byte

nLB, // RAM Lower Byte

Data_In,

Address_In,

RxD_endofpacket,

LEDR,

WE,

clk); // Write Enable

output reg [17:0] Address; // RAM Signals // include

inout [7:0] Data_Bus;

output nRD, nWR;

output nUB, nLB;

output nCE;

input WE; // Write Enable

input [17:0] Address_In ;

input [7:0] Data_In;

input RxD_endofpacket;

output [17:0] LEDR; // include reg

input clk;

assign nUB = 1'b1; // Disable Upper Byte

assign nLB = 1'b0; // Enable Lower Byte

assign nCE = 1'b0; // Enable Chip

assign nRD = 1'b0; // Read Enable

assign nWR = !WE; // Write Enable

assign Data_Bus = WE? Data_In : 8'hzz;

always @(posedge RxD_endofpacket)

if(RxD_endofpacket==1)

begin

if(WE==1)

Address <= Address + 1;

//else

//Address <= Address + 0;

end

assign LEDR = Address;

endmodule

PLZ... help me http://www.edaboard.com/images/smiles/icon_sad.gif