Decoupled serial memory access with passkey protected memory are

Details Decoupled serial memory access with passkey protected memory are Decoupled serial memory access with passkey protected memory are

1998-06-02

2000-11-14

Nguyen, Hiep T.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711103, 710129, G06F 1216

Patent

active

061483842

ABSTRACT:
An integrated circuit such as a host adapter for connection to a system bus of a host computer includes a memory interface for a local memory including a serial memory such as an SEEPROM. The memory interface is capable of unsupervised multi-bit transfers between the serial memory and a data register in the memory interface. The host computer to access the serial memory starts the memory interface on a multi-bit access (i.e., read, write, or erase), checks a busy bit in the memory interface to determine when the access is complete, and accesses the data register. Thus, the host computer is decoupled from bit-by-bit management of transfers, and the integrated circuit or a bus device incorporating the integrated circuit requires less software overhead for use of serial memory. The memory interface further includes protection circuitry that prevents writing or erasing of a portion of the memory that a flag designates as protected. The flag is in a register that does not permit changes unless the host adapter is in a state such as corresponding to a target abort exists. Accordingly, the host can write or erase protected memory by causing a target abort, changing the flag to unprotect the memory, and then changing the memory. Since the state is unlikely to exist when a software might unintentionally access the flag, unintended changes to the protected memory are unlikely.

REFERENCES:
patent: 5363334 (1994-11-01), Alexander et al.
patent: 5410680 (1995-04-01), Challa et al.
patent: 5517646 (1996-05-01), Piccirillo et al.
patent: 5815426 (1998-09-01), Jigour et al.
patent: 5920708 (1999-06-01), Gates et al.
patent: 5991179 (1999-11-01), Schweighofer
patent: 6002737 (1999-12-01), Devanagundy et al.

Affiliated with

Also associated with

Rating

Decoupled serial memory access with passkey protected memory are does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Decoupled serial memory access with passkey protected memory are, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decoupled serial memory access with passkey protected memory are will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2075901