System for communicating with and initializing a computer periph

Details System for communicating with and initializing a computer periph System for communicating with and initializing a computer periph

1998-05-29

2000-12-26

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

710 49, 710 73, 710126, 711119, 712 36, 709400, G06F 1314, G06F 1316, G06F 1320

Patent

active

061674729

ABSTRACT:
A system, device, and method allowing a host device to communicate with, and initialize, an uninitialized peripheral device includes, on the peripheral device, logic for storing a separate mask corresponding to each of a plurality of memory locations, and logic, responsive to a request for reading a memory location, for outputting a bit-wise exclusive-OR of data stored in the memory location and the corresponding mask. The mask is equal to a bit-wise exclusive-OR of a predetermined configuration value and a preset value. Thus, if the memory location is not pre-programmed with configuration information, the bit-wise exclusive-OR of the data stored in the memory location and the corresponding mask results in a valid default configuration value. Once the host device is able to communicate with the peripheral device, the host device programs the peripheral device by storing in the memory location a new data value equal to the bit-wise exclusive-OR of a new configuration value and the corresponding mask.

REFERENCES:
patent: 5386469 (1995-01-01), Yearsley et al.
patent: 5410660 (1995-04-01), Divine et al.
patent: 5815723 (1998-09-01), Wilkinson et al.
patent: 5862160 (1999-01-01), Irvin et al.
patent: 5890006 (1999-03-01), Tran et al.

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