| ??? 11/19/07 19:18 Read: times |
#147211 - WE on EEPROM Responding to: ???'s previous message |
Mike Stegmaier said:
I was wondering if I can get the WRITE operation of the EEPROM active, only when the signal to the WE rises. In other words, can I treat the WE pin the same way as a clock pin is treated on a 74xx273 flipflop, or do I have to treat the WE pin the same as a clock on a 74xx373 latch? Actually, I don't think that you can consider it as either a latch enable or a rising-edge clock. Look carefully at Figures 15.1 and 15.2. You need to assert the address with the falling edge of the WE\ (or CE\) and keep the address valid for its hold time. Then you have to meet the data setup to rising-edge WE\ time, AND the WE\ pulse width. With either a transparent latch or a flip-flop, all you really care about is the state of the data around the clock-edge set-up time. (Of course with a latch in its transparent state, the inputs fall through to the output whereas with a flip-flop, the output changes only a clock-to-out after the rising edge of the clock.) -a |
| Topic | Author | Date |
| WE' on EEPROM | 01/01/70 00:00 | |
| WE on EEPROM | 01/01/70 00:00 | |
| Do not overlook the CPU timing spec! | 01/01/70 00:00 | |
| during programming... | 01/01/70 00:00 | |
What about afterward? | 01/01/70 00:00 |