DE0板子cycloneiii片子内到底有多大的ram资源

chalk

介绍资料上说DE0板子cycloneiii片内有504kbits 的ram，可我在sopc中加了个42kbytes  的片上memoryDE0板子竟然在quartus编译不通过，why?
Info: Fitter placement preparation operations beginning
Error: Cannot place all RAM cells in design
        Info: Selected device has 56 memory locations of type M9K. The current design requires 57 memory locations of type M9K to successfully fit.
        Info: Memory usage required for design in current device: 102% M9K memory block locations required
Info: Fitter placement preparation operations ending: elapsed time is 00:00:04
Error: Can't fit design in device
Info: Generated suppressed messages file E:/nios_ii/DE0_LAB/NIOS_LCD/nios_lcd.fit.smsg
Error: Quartus II Fitter was unsuccessful. 2 errors, 11 warnings
        Error: Peak virtual memory: 221 megabytes
        Error: Processing ended: Sat May 29 14:31:59 2010
        Error: Elapsed time: 00:00:33
        Error: Total CPU time (on all processors): 00:00:21
Error: Quartus II Full Compilation was unsuccessful. 4 errors, 170 warnings