ram megafunction

would like to use the altsyncram megafunction.

When a ram block is defined as:

module ram_64x20 (

clock,

wren,

rden,

address,

wrdata,

rddata

);

input clock;

input wren;

input rden;

input [5:0] address;

input [19:0] wrdata;

//************************************************** ***************************

// Regs

output reg [19:0] rddata;

reg [19:0] mem [0:63]/* synthesis syn_ramstyle="block_ram"*/;

it gets mapped to the ram megafunction, but this ram block does not:

module ram_512x32_en (

clock,

wren,

rden,

address,

byteena,

wrdata,

rddata

);

input clock;

input wren;

input rden;

input [8:0] address;

input [3:0] byteena;

input [31:0] wrdata;

//************************************************** ***************************

// Regs

output reg [31:0] rddata;

reg [31:0] mem [0:511]/* synthesis syn_ramstyle="M9K, no_rw_check"*/;

Is there a way to get the quartus tool to map this using the ram megafunction ?

Thanks