Cypress Semiconductor Corporation

Chia Jen Chang

Johnie Au

Parinda Mekara

An apparatus comprising a flag generation circuit configured to generate a full flag signal in response to (i) a read clock signal, (ii) a write clock signal and (iii) a look ahead bitwise comparison configured to detect when a read count signal and a write count signal are equal.

High speed FIFO synchronous programmable full and empty flag generation

A state machine comprising a first input receiving a first read clock, a second input receiving a first write clock, a third input receiving a first programmable Almost Full look-ahead signal, a fourth input receiving a second read clock, a fifth input receiving a second write clock, and a sixth input receiving a second programmable Almost Full look-ahead signal is disclosed. The state machine manipulates the inputs to produce an output signal representing an Almost Full output flag that is at a first logic state when a FIFO is Almost Full and is at a second logic state when the FIFO is Not Almost Full.

High speed asynchronous and programmable state machine for generating almost full synchronous flags in a synchronous FIFO

An apparatus comprising a flag generation circuit configured to generate an empty flag signal in response to (i) a read clock, (ii) a write clock and (iii) a look ahead bitwise comparison configured to detect when a write count signal minus a read count signal is equal to 1.

A state machine comprising a first input receiving a first write clock, a second input receiving a first read clock, a third input receiving a first programmable Almost Empty look-ahead signal, a fourth input receiving a second write clock, a fifth input receiving a second read clock, and a sixth input receiving a second programmable Almost Empty look-ahead signal is disclosed. The state machine manipulates the inputs to produce an output signal representing an Almost Empty output flag that is at a first logic state when a FIFO is Almost Empty and is at a second logic state when the FIFO is Not Almost Empty.

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Chia Jen Chang