Why can't I find the lpm_fifo_dc function to implement a dual-clock first-in first-out (FIFO) megafunction as recommended by MAX PLUS® II Help? (MAX PLUS II version 9.21, 9.3)

Follow these steps to invoke the dual-clocked FIFO megafunction in the MAX PLUS II software:

1. Select the MegaWizard Plug-In Manager option in the File menu.
2. Click on Create a new custom MegaWizard variation and then Next
3. Open up the Storage folder located in the Available Megafunctions window, and select FIFO. (Note that the dcfifo and lpm_fifo_dc options are not available.) Make sure to specify the name and type of your output file.
4. For the MegaWizard^™ option Do you want a common clock for reading and writing the FIFO, choose No, synchronize reading and writing to rdclk and wrclk, respectively. This option automatically implements lpm_fifo_dc, even though the name is not directly specified.
5. Complete the megafunction wizard as desired.

The generated output file will show that the dcfifo megafunction was used, but the actual megafunction invoked is lpm_fifo_dc.