| ??? 01/17/05 05:46 Read: times |
#85071 - Use This Idea Responding to: ???'s previous message |
I would use a compact flash card. These have a relatively easy parallel bus type interface that you can connect up to some 8051 ports or to a decoded XRAM bus bank. The data access is actually reasonably fast but it is in blocks of 512 bytes that are accessible in sequential manner.
Even for a 25 MHz SiLabs part I found it hard for the micrcontroller to interface to the card at data transfer rates that exceeded the capacity rate supported by the card. To make effective use of a block organized memory like a compact flash card you must have some other XRAM available to be used for the packing and unpacking of your data blocks. SiLabs parts that have 1K up to 8K bytes of on-board XRAM are ideal candidates for use with a CF card interface. In particular the parts in the 100-pin TQFP package with 8 ports of I/O are nice to use because of plenty of I/O to accomodate the CF card interface, the onboard XRAM, and the 1X clocking of the CPU engine makes code run very fast when copying data blocks from the XRAM buffers to and from the flash card. Michael Karas |
| 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 |