TRANSFER DESTINATION ID DESIGNATING CIRCUIT

• Main Authors: OKADA KATSUYUKI, WAKIMURA YOSHIAKI, SHIBATA YUJI, OKAZAKI MAKOTO
• Format: Patent
• Language: English
• Published: 26.04.1991
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

PURPOSE:To designate a correct transfer destination ID by an MPU and to start a processing excepting for the MPU without waiting for the MPU by applying the contents of a first register to a command when the MPU executes transfer through a system bus, and applying the contents of a second register to the command in the case of transfer excepting for the MPU. CONSTITUTION:An MPU 4 sends out the specified address of allocation for writing the transfer destination ID to a local bus 3 and executes write access. Data are written into a transfer destination ID register 11 for MPU and since an I/O 5 executes writing operation, the data are written into a transfer destination ID register 12 excepting for MPU. In the case of transfer through a system bus 2, the contents of the two registers 11 and 12 are selected while controlling a selector 13 by an ACK signal.