I have the answers to this microprocessor problem. Will someone please explain h
ID: 2266344 • Letter: I
Question
I have the answers to this microprocessor problem. Will someone please explain how to get those answers? Thank you
3) (6 pts) An HC 1 system needs to be augmented by the addition of one external RAM chip. The chip has one active-high chip enable signal (CSI). The address space allocated to this external RAM is S6000-S6FFF. a) What is the memory capacity (in kilo bytes) of this RAM chip? Capacity= 4 KB b) How many address lines does it have? Number of address lines 12 c) Give a Boolean expression of the chip enable signal CSI CSI =Explanation / Answer
The number of memory locations available between 6000-6FFF(including both) are 4096. So the capacity of RAM must be 4096 i.e. 4KB (1KB=1024).
a) So the capacity is 4KB.
b) To address these 4096 memory locations we need 12 addressing lines, the length of the word is given by 4096=212 so 12(power of 2) address lines are required.
c) The Boolean expression given depends on the total memory allocation as this is an external RAM which is the 10th(A15'A14A13A'12) chip the remaining address lines are used as chip select lines to save hardware. The total memory size is 216=65536 (since A15...A0)