What is chip select in RAM?

What is chip select in RAM?

The chip select is a command pin on many integrated circuits which connects the I/O pins on the device to the internal circuitry of that device. CS may also affect a power consumption or serve as cycle control in certain circuits (such as SRAM or DRAM).

At which pin number is suitable for chip select?

The following pins are used in SPI Bus mode: Chip select – Pin 1. Data in – Pin 2. Clock – Pin 5.

How is chip select calculated?

1. Calculate how many multiples of the chip size there are in the address space. 64K/2K = 32.
2. Calculate which multiple corresponds to the starting location. For the EPROM, the starting location is 0K.
3. For the EPROM, the 16 bit address can be broken into 5 chip select lines, and 11 lines for inside the EPROM.

Which is used to select the required I O device or a memory chip?

The corresponding memory chip or I/O device is selected by a decoding circuit. Memory requires some signals to read from and write to registers and microprocessor transmits some signals for reading or writing data.

How to select one of the memory chips?

We will design the system so that the each row of addresses will correspond to a different memory chip. The row addresses can be viewed as 00XX, 01XX, 10XX, 11XX. The X’s represent the address inside the chip, the other two bits are used to select one of the chips.

How many bits are there for chip select?

There will be 14 bits for the chip select lines to the PIO. Calculate the multiple that corresponds to the last 4 bytes before 64K (the starting location for the PIO). Theoretically, the PIO could be placed at any multiple of 4.

How many address lines are needed for a memory chip?

Address lines A 1 to A 14 inclusive are required to address the 16384 locations on each memory chip. A 3-to-8 line decoder is used to select a single memory chip (actually almost always providing active-low C E ¯ signals, one for each memory chip).

How many chip select lines are in the EPROM?

For the EPROM, the 16 bit address can be broken into 5 chip select lines, and 11 lines for inside the EPROM 00000XXXXXXXXXXX Consider the RAM It is the same size as the EPROM, so it will also have 5 chip select lines. Calculate the multiple that corresponds to 32K (the starting location for the RAM) 32K/2K = 16

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