Re: [linux-sunxi] A10/A13/A20 interface asyncroneous memory
Thanks Runzhong for the suggestions. We need 16bit wide SRAM interface so NAND flash port doesn't suit us. We plan to build SRAM on top of GPIO system. The interface is going to be used sporadically for a fraction of second, so I guess we will be able to take the CPU fully (no DMA) while it is active. Anyone implemented similar thing with AW? Thanks Dimitar 11 март 2014, вторник, 03:05:45 UTC+2, Runzhong Yi написа: It depends on your needs. If simply want to expand some DI/DO, ADC/DAC or some other peripheral, USB maybe a good, cheap and expandible option. I don't see too much needs in SRAM interface. If you desperately need a parellel interface, you can use nand flash controller with a small CPLD. 2014-03-05 17:51 GMT+08:00 Dimitar Penev dpe...@gmail.com javascript:: Thanks Runzhong, It is as a big limitation of the AW SoC, isn't it? Dimitar 04 март 2014, вторник, 12:00:58 UTC+2, Runzhong Yi написа: For A10 or A13, the answer is absolutely NO! I didn't checked the datasheet for A20, but I think it's the same. 2014-03-03 21:24 GMT+08:00 dpe...@gmail.com: Hi All, I am wondering if Allwinner A10/A13/A20 SoC can support external asynchronous memory. (8/16 bit Data bus, Address bus, \RD, \WR, \CS) I don't see information about this in the A20 datasheet. Is there some software component in sunxi Linux about this? Pointers are very welcome. Thanks Dimitar -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [linux-sunxi] A10/A13/A20 interface asyncroneous memory
On 03/25/2014 07:18 PM, Dimitar Penev wrote: Thanks Runzhong for the suggestions. We need 16bit wide SRAM interface so NAND flash port doesn't suit us. We plan to build SRAM on top of GPIO system. The interface is going to be used sporadically for a fraction of second, so I guess we will be able to take the CPU fully (no DMA) while it is active. Anyone implemented similar thing with AW? I haven't heard of something as such done yet. While it should be possible to talk to an sram via gpio; don't exect it to be super fast, from what I heard, is that the GPIO's are pretty slow. Check the ML archives for more info. Olliver Thanks Dimitar 11 март 2014, вторник, 03:05:45 UTC+2, Runzhong Yi написа: It depends on your needs. If simply want to expand some DI/DO, ADC/DAC or some other peripheral, USB maybe a good, cheap and expandible option. I don't see too much needs in SRAM interface. If you desperately need a parellel interface, you can use nand flash controller with a small CPLD. 2014-03-05 17:51 GMT+08:00 Dimitar Penev dpe...@gmail.com javascript:: Thanks Runzhong, It is as a big limitation of the AW SoC, isn't it? Dimitar 04 март 2014, вторник, 12:00:58 UTC+2, Runzhong Yi написа: For A10 or A13, the answer is absolutely NO! I didn't checked the datasheet for A20, but I think it's the same. 2014-03-03 21:24 GMT+08:00 dpe...@gmail.com: Hi All, I am wondering if Allwinner A10/A13/A20 SoC can support external asynchronous memory. (8/16 bit Data bus, Address bus, \RD, \WR, \CS) I don't see information about this in the A20 datasheet. Is there some software component in sunxi Linux about this? Pointers are very welcome. Thanks Dimitar -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com mailto:linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [linux-sunxi] A10/A13/A20 interface asyncroneous memory
Hi, El 25/03/14 20:23, Dimitar Penev escribió: We need 16bit wide SRAM interface so NAND flash port doesn't suit us. We plan to build SRAM on top of GPIO system. The interface is going to be used sporadically for a fraction of second, so I guess we will be able to take the CPU fully (no DMA) while it is active. Anyone implemented similar thing with AW? I don't know what you're trying to achieve, but have you considered using SPI? There are SRAM with SPI bus connectivity, like http://ww1.microchip.com/downloads/en/DeviceDoc/22100D.pdf Cheers, Emilio -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [linux-sunxi] A10/A13/A20 interface asyncroneous memory
It depends on your needs. If simply want to expand some DI/DO, ADC/DAC or some other peripheral, USB maybe a good, cheap and expandible option. I don't see too much needs in SRAM interface. If you desperately need a parellel interface, you can use nand flash controller with a small CPLD. 2014-03-05 17:51 GMT+08:00 Dimitar Penev dpe...@gmail.com: Thanks Runzhong, It is as a big limitation of the AW SoC, isn't it? Dimitar 04 март 2014, вторник, 12:00:58 UTC+2, Runzhong Yi написа: For A10 or A13, the answer is absolutely NO! I didn't checked the datasheet for A20, but I think it's the same. 2014-03-03 21:24 GMT+08:00 dpe...@gmail.com: Hi All, I am wondering if Allwinner A10/A13/A20 SoC can support external asynchronous memory. (8/16 bit Data bus, Address bus, \RD, \WR, \CS) I don't see information about this in the A20 datasheet. Is there some software component in sunxi Linux about this? Pointers are very welcome. Thanks Dimitar -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[linux-sunxi] A10/A13/A20 interface asyncroneous memory
Hi All, I am wondering if Allwinner A10/A13/A20 SoC can support external asynchronous memory. (8/16 bit Data bus, Address bus, \RD, \WR, \CS) I don't see information about this in the A20 datasheet. Is there some software component in sunxi Linux about this? Pointers are very welcome. Thanks Dimitar -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
