Extending circuit for memory and transmitting-receiving device using extending circuit for memory
AssigneeOki Electric Industry Co., Ltd.
InventorHiroyasu Noda
Life of this patent
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Abstract
An Extending circuit for memory comprises: an output data effective signal generator 2 for, when a status signal STNF from a next-stage FIFO circuit represents a data writable state, asserting a write enable signal NWEO from the next-stage FIFO circuit, and enabling data to be written into the next-stage FIFO circuit; and an internal FIFO write enable generator 3 for receiving a status signal STNF from the next-stage FIFO circuit, when the next-stage FIFO circuit is in a data unwritable state, asserting an internal FIFO write enable signal S3, and enabling data to be written into the internal FIFO circuit 1.
Claims4
An extending circuit for memory which has an internal FIFO circuit and is connected with an external FIFO circuit, in order to extend memory capacity used for writing input data, comprising:
- an output data effective signal generator which, when, based on a status signal output from said external FIFO circuit, judged that said external FIFO circuit can write data, makes said external FIFO circuit perform writing operation, for outputting said input data into said external FIFO circuit;
- and
- an internal FIFO write enable generator which, when, based on said status signal output from said external FIFO circuit, judged that said external FIFO circuit can not write data, makes said internal FIFO circuit perform writing operation, for writing said input data into said internal FIFO circuit.
Dependencies are inferred from the claim text.