Cyclone II FPGA 不支持双口RAM吗

Error: M4K memory block WYSIWYG primitive "lpm_ram_dp0:inst6|altsyncram:altsyncram_component|altsyncram_4p22:auto_generated|ram_block1a3" utilizes the dual-port dual-clock mode. However, this mode is not supported in Cyclone II device family in this version of Quartus II software. Please refer to the Cyclone II FPGA Family Errata Sheet for more information on this feature.

译文如下：错误：内存块的M4K所见即所得原始的“lpm_ram_dp0：auto_generated | ram_block1a3”采用了双口双时钟模式。然而，这种模式是不支持的Cyclone II器件系列在这个版本的Quartus II软件。请参阅更多有关此功能的信息与Cyclone II FPGA系列的勘误表。
但CYCLONE 的HANDBOOK 是支持双口RAM ，请问啥问题引起上面现象？

However, this mode is not supported in Cyclone II device family in this version of Quartus II software.
quaruts软件版本不支持CycloneII器件工作在这种模式。
软件版本过低吧？

啊，你用的哪个版本的QUARTUS2

我用8.1版本是成功使用了双口RAM和异步FIFO的