As discussed above, each of the global word lines (e.g., GR0 to GR3) connects to SWDs in order to quickly drive the signal levels on the respective word lines. FIG. 4B illustrates exemplary embodiment of a SWD array arrangement corresponding to global word lines GR0 and GR1. For clarity, only two sets of SWDs are shown for each global word line GR. For example, SWDs 450 and 460 are connected to global word line GR0, and SWDs 470 and 480 are connected to global word line GR1. However, more than two SWDs can be connected to each global word line GR such as, for example eight SWDs, sixteen SWDs or more. Each of the SWDs 450, 460, 470, and 480 output a local word line WR0, WR1, WR2, and WR3, respectively. As seen in FIG. 4B, the configuration of each of the SWDs 450, 460, 470, and 480 can be the same. Accordingly, for brevity, only the configuration and operation of SWD 450 will be discussed.
