Data buffer having separate lock bit storage array
US4589092A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1983 |
| Grant date | May 13, 1986 |
| Priority date | — |
| Expiry date | Dec 12, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/145
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A separate lock bit array (LBA) is provided in combination with a translation lookaside buffer (TLB) in a data processing system such that the lock bits are stored in and accessed from the LBA. A segment register with a portion for an "S" bit is included and when S=1, a translation operation for the lock bits is performed in parallel with the TLB accessing by use and operation of the LBA. In such operation, when S=1, lower order virtual bits from a central processing unit (CPU) address register are applied to the LBA to select one of the rows of the LBA which consists of virtual address bits and lock bits. Segment identification bits from the segment register are combined with virtual bits from the CPU address register and are applied to first and second compare circuits. If there is a match in the first compare circuit with a first group of virtual bits from an LBA location, a first flag signal is generated and applied to a gate circuit to gate out a first associated group of lock bits from a first location. Likewise, the combination of bits are compared with VA'.sub.b bits in the second compare circuit, and if a match occurs in the second compare circuit, a second flag signal is …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.