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Posted on Jan 02, 2017
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Feb 17, 2016 | Cars & Trucks
Oct 31, 2013 | Computers & Internet
RAM is a type of computer memory accessed randomly during hard drive processes.
A computer's RAM is considered "random" because any byte of memory can be accessed without processing previous bytes.
Purpose of RAM
RAM is used to load and run programs or applications on a computer's operating system. More RAM means more applications and programs can be run simultaneously.
Static Random Access Memory, or SRAM, stores data on a computer in a static method, meaning the data stays the same with power being supplied to the memory chip. SRAM is the faster RAM when compared with DRAM.
Dynamic Random Access Memory, or DRAM, is a type of memory used in personal home computers. This type of memory must have an electrical current to refresh. DRAM is used more commonly because it's less expensive to manufacturer and install in chips.
Extended Data Output, or EDO, is a new type of DRAM chip that uses technology to add 10 to 15 percent more speed than normal. A computer that uses EDO technology must meet the chip requirements or the EDO will not be recognized.
Fast Page Mode, or FPM, is a RAM speed enhancement that uses rows of bits selected in columns and rows of the memory.
FPM is used in EDO RAM.
Nov 02, 2012 | Computers & Internet
There are three special "Enable" pins on the EEPROM: CE (Chip Enable), OE (Output Enable), and WE (Write Enable). CE simply activates the chip (if CE is not enabled, the EEPROM will do nothing). OE makes the chip output a byte, and WE makes the chip program a byte into itself. When you are programming an EEPROM, you want to keep CE enabled the whole time, so tie CE low. (Because all three of these Enable signals are active-low; At least, they are on the 2865.) You also want to keep OE disabled the entire time, because you are not having the EEPROM output any bytes; Rather, you are programming bytes into it, so leave OE disabled: If it is active-low, tie it high to disable it. That leaves WE; Leave WE disabled for now.
The next thing you need to do is turn your EEPROM on. Connect its power pins to a power supply. (For the 2865 chip, that would be pins 14 and 28.)
The biggest step is to actually program the byte. First, configure the EEPROM's address and data buses to indicate the byte you would like to store, and the address you want to store it in. For example, to store the value 80 in the very first byte of the EEPROM (which is address 0), you'd tie all the address bus pins low (which means logical zero), so the address is set to 0. Then you'd set the data bus pins to the binary representation of 80, which is 01010000. Remember that bit numbers are read from right to left, not from left to right, so in this example, the first four data bus pins should be 0. (The second data bus pin should NOT be 1; Only the fifth and seventh will be 1.)
Once you have set up the address and data buses, the only thing left to do is cycle the WE pin to actually write the byte. Send WE low for a moment (assuming it is active-low), then put it high again. If the EEPROM is working properly, you have now stored your byte, and you can later examine it with OE. On the 2865 (and many other EEPROMs), there is a READY/BUSY pin, which is an output from the EEPROM which indicates when the chip has finished writing to itself and is ready to accept more input
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