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Altera_Forum
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17 years ago

Error: Can't place pin mem_dq[2] to location R8

Hi, I build a project of cycloneIII including CFI,SSRAM,DDR SDRAM,PIO,JTAG and PLL. But when I fit it there is the error as show below: Error: Can't place pin mem_dq[2] to location R8. Error...
Altera_Forum's avatar
Altera_Forum
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17 years ago

As far as I see, the cycloneiii_3c25_start_niosii_standard is using the same resources and compiles without errors. Did you import the DDR RAM design *.tcl files, particularly the pin assignments, including the output-enable-group assignments for bidirectional DDR pins?

If all necessary settings are in effect and the error would be due to an incompatible pin assignement of the Evalboard, some outputs in the B3_N0 Vref group may be declared static by assigning a ToggleRate of 0 MHz to them. They are ignored for I/O pin distance rules then.