Timeline for Chip select for the ROM
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Sep 27, 2020 at 15:32 | comment | added | AJN | "My question is that when A12 is used as address lines for the ROM then can we use it for CS signal also". Like mentioned in the answer, "the line coming out of the 8085 can be split into two traces". So, yes, it can be used for two purposes. | |
| Sep 27, 2020 at 13:21 | comment | added | Justme | Because you need A12 for both things. A12 needs to be used for Chip Select to get the correct address, without it, Chip Select will be wrong. A12 needs to be used also as ROM memory address to select which 4k half of the 8k chip is used. | |
| Sep 27, 2020 at 13:19 | comment | added | Dave Tweed | That will happen any time the memory is not sitting a "natural" position in the address space -- in other words, the assigned address range has boundaries that are not multiples of the memory's size. When that happens, you need to use one or more of the address lines in both places. | |
| Sep 27, 2020 at 13:04 | vote | accept | Anshul Gupta | ||
| Sep 27, 2020 at 13:03 | comment | added | Anshul Gupta | What is it that you did not understood. What I meant is that some of the address lines coming out of the 8085 are used as address lines for the memory (ROM in this case) and others (the higher order address lines) are used as the chip select signal. My question is that when A12 is used as address lines for the ROM then can we use it for CS signal also. | |
| Sep 27, 2020 at 12:47 | history | edited | AJN | CC BY-SA 4.0 |
added 32 characters in body
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| Sep 27, 2020 at 12:42 | history | answered | AJN | CC BY-SA 4.0 |