| 摘要 |
PURPOSE:To couple a tag and a data field in a single machine cycle by providing internally a logic circuit which receives information including a tag value, information including the data field, and tag and field designating information as inputs and couples them logically to generate data with the tag. CONSTITUTION:AND circuit 6 operates AND at every 4 bits of a tag word 2 and those of a field mask 4, and an AND circuit 7 operates AND between 4 bits of a data word 3 and those of the field mask 4 inverted by a NOT circuit 8. Consequently, the output 9 of the AND circuit 6 has the tag value in a higher order N-bit position and has all '0' in a lower order N'-bit position, and the output 10 of the AND circuit 7 has the data field in the lower order N'-bit position and has all '0' in the higher order N-bit position. An OR circuit 11 operates OR at every bit of the output 9 of the AND circuit 6 and that of the output 10 of the AND circuit 7. As the result, data 5 with the tag which has the tag value in the higher order N-bit position and has the data field in the lower order N'-bit position is obtained as the output of the OR circuit 11. |
