1. Home
  2. Embedded Programming
  3. EP9312 & SDRAM

EP9312 & SDRAM

Hi,

Does anybody have any experience designing with the Cirrus EP9312 processor? I'm looking at using it for a project but it's unclear to me how to physically connect SDRAM modules to the processor's address bus.

The SDRAM chapter of the EP9312 user's guide [1] shows how the processor maps address bus signals to the signals for the SDRAM address and bank selects (SYA[13-0], SYB[1-0]). Unfortuneately the device data sheet [2] makes no mention of the SYA and SYB signals, only the general address bus pins AD[25-0]. I'd like to know which pins #'s on the processor are actually used to address SDRAM. I found an app note for the EP7312 [3] that tells me exactly what I need to know but I haven't found a similar document for the EP9312. Can anyone help?

TIA,

Scott

[1]
formatting link
[2]
formatting link
[3]
formatting link
Reply to
sz
Loading thread data ...

Unless it sprouted another 12 or so DRAM address lines since 2001 when I last worked with it the address lines of the SMI (static memory interface) are shared with the SDRAM controller - that is,the DRAM and SRAM-like-peripherals share a common address and data bus.Obviously things like nCAS and nRAS aren't shared.

Thus,the DRAM parts should be physically closest to the 9312 and if you have a lot of SRAM-like-peripherals you should take note of the bus capacitance and add a 74LVC16245 as appropriate.

The 7312 is completely unrelated to the 9312.If you're still stuck,drop your FAE a line and ask (not as quick though!), Sprow.

Reply to
Sprow

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.