Adding ssram to NIOS

Hi,

I found this thread on the search of how to put the ssram into operation. My ssram seems to work now, so I write how I think it is:

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Shouldn't it begin at 2 in this case?

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You are right, for the ssram it should begin at 2, because it has a 32 bit word size. But in the example there is also the flash memory which has a word size of 16 bit, and both memorys share the same addressbus. So I guess for the sake of the flash it includes a[1].

My sopc don´t use the flash so I left tristate-bridge at defaults. (no bus sharing, because senseless without more than one slave)

My sopc has a 20 bit addressbus for the ssram. Makes sense because 2^20 = 1 M, so one address for each byte of the ssram-memory as mentioned in "Avalon Interface Specifications".

I took bit 19 to 2 of this addressbus to the flash_sram_a[19..2] pins according to CIII FPGA Starter Board Reference Manual.

At least a hello world programm runs in that way (I haven´t tested more than that till now). I hope the tristate bridge manages the writebyteenable bus bw_n to use the complete memory, but still have to test that.

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Now I have looked at the pinout of the cyclone_III_3c25_niosII_video and the

scram clock is at pin labeled "PIN_A2". So if I don't assign some clock

to this PIN_A2 in my pin assignment, I guess the scram will get no clock.

Can anyone tell me how to solve this?

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I think you just have to put a clock signal with apropriate frequency (same frequency as defined in sopc) on this pin.

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sram data bus problem

Now I have tried to compile as is. But there is another problem: I get this message:

Error: Can't place multiple pins assigned to pin location PIN_D1 (IOPAD_X0_Y27_N7)

Error: Can't place multiple pins assigned to pin location PIN_H3 (IOPAD_X0_Y22_N7)

Pins D1 and H3 are the data bus D1 and D0.

But I verified in NEEK_VIP_DEMO_LCD_SVGA (this one compiles) that the data bus

is exactly at the same pins. Could anybody give me hints?

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Follow the advices in this thread:

Damn, I can´t post links so use google and take the first hit. Google for:

"problems with pin assignments with cyclone iii starter board"

Regards

Andreas