I doubt anyone was paying enough attention for this to confuse them, but just in case...
A couple message back I mentioned having about 50 166MHz SRAM cache parts and in the previous post I mentioned having 48 parts rated for 100MHz and Industrial temperatures.
They're two different sets of parts. I have 48 Galvantech parts which are 128K X 32 and rated for 100MHz at industrial temperatures. These may be too slow to run at 200MHz (1/2) or even 133MHz (1/3), although if 113MHz Micron parts work....
I also have 53 Samsung parts which are rated for 166MHz at commercial temperatures (0C - 70C). However, the Samsung parts had me fooled for a bit. Their datasheet states 256K X 18 or 128K X 36, so I thought they could be configured as either. But it turns out that it is one datasheet for two different but related parts. The parts I have are the 256K X 18, so they would not work. One needs X32 or X36. The X36 parts are just like the X32 but with parity data bits, which the upgrade card would probably ignore.
So the Galvantech parts may be too slow , and the Samsung parts are just the wrong bit arrangement. So I'll probably need to buy the Cypress parts from DigiKey if I do this experiment.
The nice thing is that the Cypress parts are described very very similarly to the Micron parts in their respective datasheets, which gives me much more confidence that they will substitute successfully. There's a certain amount of standardization to memory parts, so one expects substitutes to work, but a little reassurance never hurts. The functional block diagrams in the two datasheets are nearly identical.
A couple message back I mentioned having about 50 166MHz SRAM cache parts and in the previous post I mentioned having 48 parts rated for 100MHz and Industrial temperatures.
They're two different sets of parts. I have 48 Galvantech parts which are 128K X 32 and rated for 100MHz at industrial temperatures. These may be too slow to run at 200MHz (1/2) or even 133MHz (1/3), although if 113MHz Micron parts work....
I also have 53 Samsung parts which are rated for 166MHz at commercial temperatures (0C - 70C). However, the Samsung parts had me fooled for a bit. Their datasheet states 256K X 18 or 128K X 36, so I thought they could be configured as either. But it turns out that it is one datasheet for two different but related parts. The parts I have are the 256K X 18, so they would not work. One needs X32 or X36. The X36 parts are just like the X32 but with parity data bits, which the upgrade card would probably ignore.
So the Galvantech parts may be too slow , and the Samsung parts are just the wrong bit arrangement. So I'll probably need to buy the Cypress parts from DigiKey if I do this experiment.
The nice thing is that the Cypress parts are described very very similarly to the Micron parts in their respective datasheets, which gives me much more confidence that they will substitute successfully. There's a certain amount of standardization to memory parts, so one expects substitutes to work, but a little reassurance never hurts. The functional block diagrams in the two datasheets are nearly identical.