Using non DIP memory
Using non DIP memory
Ok, I pretty sure it's a dumb question but I had to ask it, sorry
Looking at the price (and availability) of 5V DIP flash memory, is it possible to use TSOP/VSOP/PLCC/.... 5V Flash memory + adapter on a custom genny cart instead ?
I assume that if it's 5V, parallel and <90ns, it's ok....no ?
Like in SSF2....and perhaps Splatter House 3
I told you it was a dumb question !
Looking at the price (and availability) of 5V DIP flash memory, is it possible to use TSOP/VSOP/PLCC/.... 5V Flash memory + adapter on a custom genny cart instead ?
I assume that if it's 5V, parallel and <90ns, it's ok....no ?
Like in SSF2....and perhaps Splatter House 3
I told you it was a dumb question !
Oops, just when I complain about hard to find DIP 5V flash, I finally find something interesting....
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Of course! I plan to follow something like Devster's dual rom cart8bitwizard wrote:Those are 8-bit flash chips. You will need two of them, giving you a total of 1 MByte (8 Mbit) of memory.
I already aware ofHardWareMan wrote: What is the difference DIP or TSOP memory? There are more important parameters: volume, data bus width and access time. Is not it?
acces time : < 90ns (70ns)
bus width : x8(byte) or x16(word)
but what do you call "volume" ?
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Capacity. Size. In russian, volume and capacity are very close things when you talk about memory.KanedaFr wrote:I already aware ofHardWareMan wrote: What is the difference DIP or TSOP memory? There are more important parameters: volume, data bus width and access time. Is not it?
acces time : < 90ns (70ns)
bus width : x8(byte) or x16(word)
but what do you call "volume" ?
Last (?) question on this subject....
a lot of the newest chips are 3.3/3.0v
I know I said I was looking for 5V chip but I found some 64M 3.0V x16 bit Flash rom...
Unfortunatly, a 3.0V chip will use 3V on IO pin while a 5V chip will use 5V on IO pin....and I doubt the genny will like the 3V output on data pin nor the 3V chip will like the 5V input on adresses pin, even using a 5v->3V on rom VCC pin....or did I miss something ?
Did I need something like a bus switch like on this ParaFlasher ?
a lot of the newest chips are 3.3/3.0v
I know I said I was looking for 5V chip but I found some 64M 3.0V x16 bit Flash rom...
Unfortunatly, a 3.0V chip will use 3V on IO pin while a 5V chip will use 5V on IO pin....and I doubt the genny will like the 3V output on data pin nor the 3V chip will like the 5V input on adresses pin, even using a 5v->3V on rom VCC pin....or did I miss something ?
Did I need something like a bus switch like on this ParaFlasher ?
Last edited by KanedaFr on Thu Aug 05, 2010 12:48 pm, edited 1 time in total.
Some 3V ICs are 5V-tolerant. There are level convertors as well. In one of Flash carts (for SMD) schematics I recall was used 3V Flash with a lot of resistors to convert the levels. Here is the schematics of the cartridge (bottom part of page 3).
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It's what I read on .... this same forum (thanks Google!)
So what the use of a bus switch ? I found another source talking of this...
So what the use of a bus switch ? I found another source talking of this...
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I used a bunch of 220ohm resistors on the signal lines in one of my flashcarts that uses a 3.3V flash chip.
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