| 摘要 |
PURPOSE:To offer system for limiting the generation of an effective address EA into a segment or a segment group designated by a program, by providing plural connection designating register for holding a connecting bit and connecting range information. CONSTITUTION:A register BR of a number designated by an instruction word 1 is selected from a BR group 2, and a base address BS is read out to a register 4. The number of connection designating registers (LR) 5 is the same as the number of segments. The LR sets in advance by a program a designated connecting bit E and connecting range information L to a segment having the same number as the register number, and the LR having a segment number to which the base address BS designated by the bit number of the register 4 belongs is selected, and is read out to a digit designating register DR 6. The E bit and L designated to the segment to which the read-out BS belongs are read out to the DR 6. They are prepared in advance in a table having en entry in accordance with a segment for converting a virtual address to a read address, and can be loaded to the LR by an instruction. |
