MAX10 UFM Read Operation

I am trying to read from MAX10's UFM but the device does not assert the readdatavalid signal as specified in UFM user guide. Any guess why is it so? I am sharing the relevant code below:

task data_read_top;
	case (read_state)
		FLASH_READ_IDLE	:	
			begin
				read_state	<=	FLASH_READ1;
			end
		FLASH_PRE_READ	:
			begin
				if (avmm_data_waitrequest)
					read_state	<= FLASH_PRE_READ;
				else
					read_state	<= FLASH_READ1;
				end
		FLASH_READ1		:	
			begin
				data_read1(00000_0101_1111_0000); 
				read_state	<=	FLASH_READ2;
			end
		FLASH_READ2		:	
			begin
				data_read2;
				read_state	<=	FLASH_READ3;
			end
		FLASH_READ3		:	
			begin
				if (~avmm_data_readdatavalid)
				begin
					read_state <= FLASH_READ3;
				end
				else
				begin
					data_read3;
					data_out    <= avmm_data_readdata;
					read_state <= FLASH_READ4;
				end
			end
		FLASH_READ4		:	
			begin
				read_state	<=	FLASH_READ_IDLE;
			end
		default			:	
				read_state	<=	FLASH_READ_IDLE;
	endcase
 
 
endtask
 
task data_read1;
input  [16:0] addr;
begin
    avmm_csr_read			<= 1'b0;
    avmm_csr_write			<= 1'b0;
    avmm_csr_addr			<= 1'b0;
    avmm_data_addr			<= addr;
    avmm_data_read			<= 1'b1;
    avmm_data_burstcount	<=	2'b01;
end
endtask
  
task data_read2;
begin
    avmm_csr_read		<= 1'b0;
    avmm_csr_write		<= 1'b0;
    avmm_csr_addr		<= 1'b0;
    avmm_data_read		<= 1'b0;
    avmm_data_addr		<=	17'b0000_0000_0000_0000_0;
    avmm_data_burstcount	<=	2'b00;
end
endtask
 
task data_read3;
begin
    avmm_csr_read	<= 1'b0;
    avmm_csr_write	<= 1'b0;
    avmm_csr_addr	<= 1'b0;
end
endtask

The task data_read_top itself is called in another case statement. What I have observed in SignalTap II is that it remains stuck at state FLASH_READ3.