Handel-C Vs Verilog Speed Difference!

[CMOS]

I just tried this simple LED blinking code in Verilog and Handel-C. The result I got was stunning. The verilog version blinks LED at much faster rate than Handel-C version on the same FPGA board. Can anyone explain the reason!

Here are the codes
1. Verilog

module LEDBlink(led1, led2, clk);
input clk;
output led1;
output led2;

reg [23:0] cnt;
always @(posedge clk) cnt<=cnt+24'h1;
assign led1 = cnt[20] & cnt[22] & cnt[23];
assign led2 = cnt[23];

endmodule

2. Handel-C Code

set clock = external "10" with {rate = 24, standard = "LVTTL"};

unsigned int 1 led1;
interface bus_out() led_pin1(unsigned int 1 led_pin1 = led1) with {data={"97"}, standard = "LVTTL"};

unsigned int 1 led2;
interface bus_out() led_pin2(unsigned int 1 led_pin2 = led2) with {data={"91"}, standard = "LVTTL"};

void main(void)
{
	unsigned int 24 cnt;
	while(1)
	{
		cnt++;
		led1 = cnt[20] & cnt[22] & cnt[23];
		led2 = cnt[23];
	}
}

 

[EDALIST]

this is because handle-c is sequental you should put a par statement

par
{
x
y
x
}

 

[samcheetah]

does this mean you cant put parallelism in your design with Handel-C???????????

 

[EDALIST]

it actually say you can, just remember to put the par { } before
assigments.

 

[samcheetah]

okay so par means parallel??? is that right?

 

[CMOS]

okay so par means parallel??? is that right?

Yes par = parallel and seq = sequential. By default all statement execute sequentially unless written in par block.

this is because handle-c is sequental you should put a par statement

par
{
x
y
x
}

Yes that works! Silly me..how could I forget that thing Thanks.


One more thing. Can you tell me how do you define high impedance state in Handel-C. I want to convert this Verilog statement to Handel-C,

assign FX2_FD = FIFO_DATAOUT_OE ? FIFO_DATAOUT : 8'hZZ;

 

[EDALIST]

AN EXAMPLE FOR BUS :

interface bus_ts_clock_in (int 4 read)
BiBus(int 4 writePort=x+1,
unsigned 1 enable=condition)
with {data = {"P4", "P3", "P2", "P1"}};

condition = 0; // Tri-state external pins
x = BiBus.read; // Read registered value
condition = 1; // Drive x+1 onto the pins

 

[CMOS]

EDALIST, you seem to be a Guru of Handel-C. I will try that out.

 

[CMOS]

Hey EDALIST, can you name some good tutorial/e-book/book on Handel-C? The Celoxica manual doesnt seem complete as I cant find many things in it. Our school has DK2.0.

 

[EDALIST]

here is dk 4 handlec user guide