Early Restore of Column Address Strobe for Dense Random-Access Memories in Page Mode
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
An improved Column Address Strobe (CAS) restore cycle, page cycle and better power distribution in a random-access memory (RAM) is accomplished by allowing several CAS restore phases to proceed while the CAS signal is still active. The CAS precharge time and, consequently, the CAS cycle time in page mode for a dense dynamic random-access memory, is improved by performing some CAS restoring during the open Data Valid Window. The new restore sequence shown in the figure show 1 - 4, then 5, with 6, 7 and 8 in parallel with 5 compared with the conventional sequence 1 - 5 then 6, 7, & 8 in series. The advantages gained include: 1) Improved power distribution because the restore phases occur in a more time-distributed fashion.