OUTPUT CIRCUIT FOR DEBUGGING DATA

• Main Author: SAKAI SEIKI
• Format: Patent
• Language: English
• Published: 14.11.1990
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

PURPOSE:To automatically output data written in a certain area on a storage device by transferring data from an address shown in a first comparison address register in the storage device to an address shown in a second comparison address register to an output buffer when a counter has counted out. CONSTITUTION:When an execution control part 1 accesses the storage device 2, it outputs the address to an address bus 9. Comparison circuits 5 and 6 respectively compare a value outputted on the address bus 9 with values stored in the comparison address registers 3 and 4. An AND gate 8 outputs a count signal to the counter 10 when coincidence signals from the comparison circuits 5 and 6 come to '1'. A DMA transfer control part 7 DMA-transfers data from the address stored in the comparison address register 3 in the storage device 2 to the address stored in the comparison address register 4 to the output buffer by a count out signal from the counter 10. Thus, data in the storage device can be outputted as for debugging.