Cellular Ram to operate in page read mode but to no avail

[ombadei]

cellular-ram

Hi.. Hope someone can help me on this.. please..

In VHDL, been trying to configure the cellular ram to operate in page read mode but to no avail.. I am using the digilent nexys board.. It is working well in the asynchronous mode..

I wrote to the configuration register and did a read array for the initial startup.. and tested by writing values to consecutive addresses and tried reading it.. but the last word i read is still the initial value..

MT45W8MW16BGX-708 WT

https://download.micron.com/pdf/datasheets/psram/128mb_burst_cr1_5_p26z.pdf

 

[kel8157]

mt45w8mw16bgx vhdl

Could it be the addresses change too fast? I understand cellular RAMs are slow.. Even in page mode, you can barely reach data rate of 30M biword/sec.

By the way, have you found a simulation model of the Intel StrataFlash ROM on the same board?

 

[ombadei]

cellular rams

cellular RAMs are slow

Are you saying that the specifications of the cellular ram are not within standards? I abide by the timing diagrams and gave a lot of attention to the critical timing requirements. Should i give more allowance when i output the control signals?

Currently, i wrote a set of values in consecutive locations and i am reading intermittent values.

a simulation model of the Intel StrataFlash ROM

Sorry.. as i do not require the dev board's strataFlash in my proj, i have not explore any functionalities of it.

 

[kel8157]

cellularram

cellular RAMs are slow

Are you saying that the specifications of the cellular ram are not within standards? I abide by the timing diagrams and gave a lot of attention to the critical timing requirements. Should i give more allowance when i output the control signals?

Currently, i wrote a set of values in consecutive locations and i am reading intermittent values.

oh, i can not give comment cos I dont see your timing, you maybe can download the example simulations from Micron's website, the ZIP package contains simulation model and a simple testbench. I ran it in Modelsim sometime ago and it was alright.

a simulation model of the Intel StrataFlash ROM

Sorry.. as i do not require the dev board's strataFlash in my proj, i have not explore any functionalities of it.

It's fine. Do post a link here when u have the info on that. ROM is very useful if you want to demo your designs offline.

 

[ombadei]

micron mt45w8mw16bgx-708 wt pdf

thanks.. that's really helpful..

I am new to modelsim..... Just by looking at all the different wave simulation, how do i zoom in on the page read timing cycle?

 

[kel8157]

micron psram vhdl

thanks.. that's really helpful..

I am new to modelsim..... Just by looking at all the different wave simulation, how do i zoom in on the page read timing cycle?

Hold down the wheel/center button of the mouse and drag.. it will mark an area and zoom in.