TRANSFER DESTINATION ID DESIGNATING CIRCUIT

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 t...

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Bibliographic Details
Main Authors OKADA KATSUYUKI, WAKIMURA YOSHIAKI, SHIBATA YUJI, OKAZAKI MAKOTO
Format Patent
LanguageEnglish
Published 26.04.1991
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary: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.
Bibliography:Application Number: JP19890241569