Patent ID: 6295300
Filing Date: 2001-09-25
Classification: H04L

Abstract:
A symmetric asynchronous interface circuit which is utilized for interfacing between a first device and a second device which operate asynchronously, comprising:a first synchronization circuit which receives a READY signal outputted by a control section of the first device, synchronizes the READY signal to a clock signal on the side of the second device, and outputs the synchronized READY signal to a control section of the second device;a first delay circuit for delaying a signal corresponding to the synchronized READY signal outputted by the first synchronization circuit and outputting the delayed signal as an ACKNOWLEDGE signal;a second synchronization circuit which synchronizes the ACKNOWLEDGE signal outputted by the first delay circuit to a clock signal on the side of the first device;a first pulse generation circuit which generates a pulse signal when the synchronized ACKNOWLEDGE signal is supplied from the second synchronization circuit and outputs the pulse signal to the control section of the first device as an ACKNOWLEDGE signal;a third synchronization circuit which receives a READY signal outputted by the control section of the second device, synchronizes the READY signal to the clock signal on the side of the first device, and outputs the synchronized READY signal to the control section of the first device;a second delay circuit for delaying a signal corresponding to the synchronized READY signal outputted by the third synchronization circuit and outputting the delayed signal as an ACKNOWLEDGE signal;a fourth synchronization circuit which synchronizes the ACKNOWLEDGE signal outputted by the second delay circuit to the clock signal on the side of the second device; anda second pulse generation circuit which generates a pulse signal when the synchronized ACKNOWLEDGE signal is supplied from the fourth synchronization circuit and outputs the pulse signal to the control section of the second device as an ACKNOWLEDGE signal.