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cortex M3 designstart 。

I put two slaves on system AHB bus , one is leds the other is switch .

I can write date to the leds' register to control the led on or off, but I can't read date from the switch data register .

i don't know what's wrong

here is the slave's code

**************************************************************************************************

//Transfer Response
assign HREADYOUT = 1'b1; //Single cycle Write & Read. Zero Wait state operations

//read
always @(*)
begin
if( rHADDR==(`SWITCH_BASE ))
HRDATA <= {22'h0000_00,rSW};
end