Datapath

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

A datapath is a collection of functional units such as arithmetic logic units or multipliers that perform data processing operations, registers, and buses.[1] Along with the control unit it composes the central processing unit (CPU).[1] A larger datapath can be made by joining more than one datapaths using multiplexers.

A data path is the ALU, the set of registers, and the CPU's internal bus(es) that allow data to flow between them.[2]

A microarchitecture datapath organized around a single bus

The simplest design for a CPU uses one common internal bus. Efficient addition requires a slightly more complicated three-internal-bus structure.[3] Many relatively simple CPUs have a 2-read, 1-write register file connected to the 2 inputs and 1 output of the ALU.

During the late 1990s, there was growing research in the area of reconfigurable datapaths—datapaths that may be re-purposed at run-time using programmable fabric—as such designs may allow for more efficient processing as well as substantial power savings.[4]

See also[edit]

References[edit]

  1. ^ a b Null, Linda; Lobur, Julia (2006). The Essentials of Computer Organization and Architecture. Jones & Bartlett Learning. p. 2016. ISBN 978-0-7637-3769-6. All computers have a CPU that can be divided into two pieces. The first is the datapath, which is a network of storage units (registers) and arithmetic and logic units... connected by buses... where the timing is controlled by clocks.
  2. ^ Edward Bosworth. "Overview of Computer Architecture".
  3. ^ Edward Bosworth. "CPU Bus Structure".
  4. ^ J. R. Hauser and J. Wawrzynek, Garp: a MIPS processor with a reconfigurable coprocessor, FCCM’97, 1997, pp. 12–21.[dead link]