System for controlling data transfer using transfer handshake pr

Details System for controlling data transfer using transfer handshake pr System for controlling data transfer using transfer handshake pr

1989-10-11

1992-01-14

Lee, Thomas C.

Boots, shoes, and leggings

3642408, 364260, 364935, 36494068, 364DIG2, G06F 1314, G06F 13364

Patent

active

050817019

ABSTRACT:
A circuit for controlling data transfer handshake protocol so that certain protocol events may occur prior to or simultaneously with the completion of a proceeding protocol event, and the ultimate results of the pending protocol event may be determined at a later time. In one embodiment of the invention a CPU operates to transfer data (either receive or send) between itself and an I/O channel every five processor clock cycles. At the beginning of each set of five clock cycles the CPU places data on the data bus and generates a transfer request (CPU-XFR) signal whenever it receives a data accepted (DATA-ACC) signal indicating that a previous data transfer has occurred. The CPU-XFR signal is generated regardless of whether or not the previous data transfer is complete at the time. The data transfer normally is completed one clock cycle after the CPU-XFR signal is generated, and at that time a transfer complete signal is generated. If the transfer complete signal is not generated, a transfer inhibits signal is generated for inhibiting the generation of the succeeding DATA-ACC signal and hence the next CPU-XFR signal.

REFERENCES:
patent: 3400372 (1965-02-01), Beausoleil et al.
patent: 4272815 (1981-06-01), Kadowaki et al.
patent: 4283760 (1981-08-01), Kita et al.
patent: 4371928 (1983-02-01), Barlow et al.
patent: 4435761 (1984-03-01), Kimoto
patent: 4455608 (1984-06-01), Suzuki et al.
patent: 4467419 (1984-08-01), Wakai
patent: 4542457 (1985-09-01), Mortensen et al.
patent: 4571674 (1986-02-01), Hatung et al.
patent: 4663730 (1987-05-01), Ikeda
patent: 4837785 (1989-06-01), McAlpine
patent: 4980851 (1990-12-01), Komoni et al.

Affiliated with

Also associated with

Rating

System for controlling data transfer using transfer handshake pr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for controlling data transfer using transfer handshake pr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for controlling data transfer using transfer handshake pr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-546863