Re: XRAM notes

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Tue, 11 Mar 2014 08:01:56 +0100 Message-ID: <531EB4E4.8010903@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 03/10/2014 09:30 PM, silverdr@wfmh.org.pl wrote:
>
> http://www.smspower.org/uploads/Development/SegaMasterSystemIIServiceManual-1715922A-1.png
>
> the _RFSH is tied up to VCC..

I assume that if your access rate for the RAM is high enough (like when 
using it for a framebuffer), you can forgo the internal refresh counter, 
the refresh will happen as a byproduct of the normal read cycles (*).

(*) In a DRAM, any read cycle of any cell will cause a refresh cycle for 
the whole row that cell is located in.

  Gerrit

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