| ??? 01/17/05 16:23 Read: times |
#85109 - 512k ONLY? :-) Responding to: ???'s previous message |
OK, so 512k+ that makes a BIG difference!
SRAMs 512k x8 in TSSOP32 are lying around in piles! :-) We use Samsung K6T4008 in volume, but there is a lot of other manufacturers of the very same, e.g. MoselVitelic, BSI, Toshiba, Renesas, Hynix - to mention only a few. You can even have a 32Mbit (=4MB x8) SRAMs these days. The only issue is that they mabe have more pins than you may want to connect directly, but than I would do with one or two 74HC574 for the high address register rather than a shift register. As for SW refresh of a SDRAM, if you have an "on chip boot code", this could also possibly take care of the refresh. Nevertheless, using a SDRAM or any other DRAM might be a pain with '51 - they are simply not intended to be used in this way; although no doubt solution exists, but I wouldn't go for that at all. Jan Waclawek |
| Topic | Author | Date |
| Large RAM bank | 01/01/70 00:00 | |
| Serial? | 01/01/70 00:00 | |
| Speed | 01/01/70 00:00 | |
| Keil...? | 01/01/70 00:00 | |
| Zylogic ZE5? (nee Triscend E5) | 01/01/70 00:00 | |
| Two choices | 01/01/70 00:00 | |
| Use This Idea | 01/01/70 00:00 | |
| Another CPU? | 01/01/70 00:00 | |
| Try This Idea Too | 01/01/70 00:00 | |
| SDRAM maybe viable | 01/01/70 00:00 | |
| What about pseudo static ram? | 01/01/70 00:00 | |
| pseudosrams are not larger | 01/01/70 00:00 | |
| Jez ? | 01/01/70 00:00 | |
| Didn't search first?! | 01/01/70 00:00 | |
| Just a BIG memory? | 01/01/70 00:00 | |
| More information | 01/01/70 00:00 | |
| 512k ONLY? :-) | 01/01/70 00:00 | |
| attach to large SRAM | 01/01/70 00:00 | |
DS80C400? | 01/01/70 00:00 | |
| I did | 01/01/70 00:00 | |
| SDRAM controller | 01/01/70 00:00 | |
| keep it simple&stupid | 01/01/70 00:00 | |
| suggestions and questions | 01/01/70 00:00 | |
| Thanks for input | 01/01/70 00:00 | |
| 2M=4x512k | 01/01/70 00:00 | |
| Good idea | 01/01/70 00:00 | |
| PCB Space - Above & Below | 01/01/70 00:00 | |
| Have you tried ISSI | 01/01/70 00:00 | |
| CF card | 01/01/70 00:00 | |
| Using SD | 01/01/70 00:00 | |
| CPLD | 01/01/70 00:00 |