DRAM

Which correctly describes a "rank" on a DRAM module?

  1. AThe number of banks inside one chip
  2. BA group of DRAM chips accessed together to make up the full data bus width (for example, 64 bits)
  3. CA performance grade of DRAM chips
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Answer: B. A group of DRAM chips accessed together to make up the full data bus width (for example, 64 bits)

A rank is a group of DRAM chips selected together by a chip-select signal that collectively make up the full width of the data bus. For example, eight 8-bit-wide (x8) chips form one 64-bit rank. Putting multiple ranks on one module increases capacity.

  • A. The internal divisions of a chip are called banks.
  • B. Correct. It is the group of chips forming the full data bus width.
  • C. Rank does not denote a performance grade.
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More DRAM questions

  1. How many 8-bit-wide (x8) DRAM chips are needed per rank to form a 64-bit data bus (without ECC)?
  2. In most current PC processors, where is the memory controller that controls DRAM located?
  3. What is commonly required by DRAM standards when the chip temperature is in the high range (for example, above 85 °C)?
  4. As DRAM capacity grows, what tends to become a problem with respect to refresh?
  5. In DRAM cell arrays, which bit-line arrangement places the paired bit lines side by side within the same array?