| ??? 09/29/05 02:54 Read: times |
#101699 - Buffering address/data bus Basic-52 |
Has anyone tried buffering the address and data lines on an 8052 in external mem mode in a 8052 Basic system?
I am having trouble buffering the data bus using a 74f245. I have tried AND'ing PSEN and RD to enable the '245 for proper read of all external read's but the system does not boot. If I use jumpers to to bypass the '245 data buffers, the systems boots up fine so it must be the to bus control signals that are the problem. Any ideas would be appreciated... Brice. |
| Topic | Author | Date |
| Buffering address/data bus Basic-52 | 01/01/70 00:00 | |
| direction | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| '573? | 01/01/70 00:00 | |
| 245 | 01/01/70 00:00 | |
| Only need one latch | 01/01/70 00:00 | |
| Re-read this... | 01/01/70 00:00 | |
| negative logic | 01/01/70 00:00 | |
| caqll a spade a spade | 01/01/70 00:00 | |
| Ok... I follow you, but... | 01/01/70 00:00 | |
| 74F623 instead of 74F245 | 01/01/70 00:00 | |
| I'd stick with a 245 | 01/01/70 00:00 | |
74AC623 is also fast | 01/01/70 00:00 | |
| A little clarification | 01/01/70 00:00 | |
| if you are ANDing them it will never wor | 01/01/70 00:00 | |
| How fast is your memory? | 01/01/70 00:00 |