Department of Computer Scien

ce and Information Engineering

National Cheng Kung University

HANEL

SEMI-

CONDUCTOR MEMORY

RAMDRAM Organization

‰In the discussion of ROM, we noted that all of them have 8 pins for data

¾This is not the case for DRAM memory chips, which can have any of the x1, x4, x8, x16 organizationsDiscuss the number of pins set aside for address in each of the following memory chips. (a) 16K

×4 DRAM (b) 16K

×4 SRAM

Solution :Since 2

14 = 16K :

(a)

For DRAM we have 7 pins (A0-A6) for the address pins and 2 pins for RAS and CAS

(b)

For SRAM we have 14 pins for address and no pins for RAS and CAS since they are associated only with DRAM. In both cases we have 4 pins for the data bus.