System for comparing counter blocks and flag registers to determ

Details System for comparing counter blocks and flag registers to determ System for comparing counter blocks and flag registers to determ

1997-02-18

2000-08-08

Lee, Thomas C.

Static information storage and retrieval

Magnetic bubbles

Guide structure

395849, 395875, 395877, 395878, 365221, G06F 1336

Patent

active

061013293

ABSTRACT:
According to the current invention, there is provided a system for transferring data into and out of a first-in, first-out (FIFO) data buffer. The buffer has a read pointer and a write pointer. The system comprises a comparator circuit, multiple counter blocks, and multiple flag registers. The counter blocks and flag registers are connected to a system clock to provide timing information and capacity indications to the comparator. The comparator circuit continuously monitors the multiple counter blocks, thereby tracking buffer pointer positions. The flag registers indicate relative buffer capacity and provide early indication to the system that the buffer is almost full or almost empty in appropriate conditions. The comparator circuit continuously evaluates the read and write counter blocks and the flag registers to determine the ability of the buffer to accept or transmit data.

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