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Rockbox mail archiveSubject: [ rockbox-Feature Requests-566169 ] Bigger DRAM Mod[ rockbox-Feature Requests-566169 ] Bigger DRAM Mod
From: <noreply_at_sourceforge.net>
Date: Sat, 08 Jun 2002 06:34:16 -0700 Feature Requests item #566169, was opened at 2002-06-08 06:34 You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=439121&aid=566169&group_id=44306 Category: Hardware Modifications Group: None Status: Open Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Bigger DRAM Mod Initial Comment: This is a follow up to the More RAM discussion. Unfortunately I keep on getting an error preventing me from posting that as a follow up. The chip already does most of the work except it can shift address bit by more than 10-bits on its own. An external 2:1 mux is all that's needed to let you use 4Mx16 DRAM chips. Guys all you need to do is help it shift 11-bit addresses by mux the address bits !! DRAM A[0] = SH1 A[11] when /RAS ='1' SH1 A[0] otherwise. You might have to adjust for CAS before RAS refresh timer though... No need for double banks of DRAM nor SRAM here... Just need to understand datasheets. Ref: See Page 143 on SH1 hardware manual ---------------------------------------------------------------------- You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=439121&aid=566169&group_id=44306 Received on 2002-06-08 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |