Communication data receiver capable of minimizing the discarding of received data during an overflow
First Claim
1. A communication data receiver for storing communication cell data received from a communication layer into a buffer memory and transferring said communication cell data to another communication layer, said communication data receiver comprising:
- a cell synchronous means for generating a synchronizing signal and a start detection signal when said received communication cell data is synchronized and a start of said received communication cell data has been detected;
a write signal generation means for generating a write signal that directs said communication cell data to be written into said buffer memory according to said synchronizing signal and said start detection signal;
a means for holding a write address of a start data of said communication cell data being written;
a means for detecting an overflow of said buffer memory;
a means for inactivating said write signal according to an overflow detection signal output by said overflow detection means; and
a means for setting the write address held in said write address holding means as a writing start address for said communication cell data received next according to said overflow detection signal.
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Accused Products
Abstract
A communication data receiver comprises a counter for generating a write address on a buffer memory for communication cell data according to a write signal directing the communication cell data to be written into the buffer memory, a latch circuit for holding a write address for start communication cell data being written, an overflow detection circuit for detecting an overflow of the buffer memory, a circuit for prohibiting communication cell data from being written into the buffer memory according to an overflow detection signal, and a circuit for setting a write address held in the latch circuit as a writing start address for the next received communication cell data in the counter according to the overflow detection signal.
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Citations
14 Claims
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1. A communication data receiver for storing communication cell data received from a communication layer into a buffer memory and transferring said communication cell data to another communication layer, said communication data receiver comprising:
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a cell synchronous means for generating a synchronizing signal and a start detection signal when said received communication cell data is synchronized and a start of said received communication cell data has been detected; a write signal generation means for generating a write signal that directs said communication cell data to be written into said buffer memory according to said synchronizing signal and said start detection signal; a means for holding a write address of a start data of said communication cell data being written; a means for detecting an overflow of said buffer memory; a means for inactivating said write signal according to an overflow detection signal output by said overflow detection means; and a means for setting the write address held in said write address holding means as a writing start address for said communication cell data received next according to said overflow detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication data receiver for storing communication cell data received from a communication layer into a buffer memory and transferring said communication cell data to another communication layer, said communication data receiver comprising:
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a cell synchronous means for generating a synchronizing signal and a start detection signal when said received communication cell data is synchronized and a start of said received communication cell data has been detected; a write signal generation means for generating a write signal directing said communication cell data to be written into said buffer memory according to said synchronizing signal and said start detection signal; an upper address generation means for generating certain upper bits of a write address on said buffer memory for said communication cell data according to said write signal output from said write signal generation means; a lower address generation means for generating certain lower bits of the write address on said buffer memory for said communication cell data according to said write signal output from said write signal generation means; a means for detecting an overflow of said buffer memory and outputting an overflow detection signal; a means for inactivating said write signal according to said overflow detection signal; and a means for setting an address lower than a current address at said lower address generation means according to said overflow detection signal and for setting a write address composed of an upper address generated by said upper address generation means and a lower address generated by said lower address generation means as a writing start address for said communication cell data received next. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A communication data receiver for storing communication cell data received from a communication layer into a buffer memory and transferring said communication cell data to another communication layer, said communication data receiver comprising:
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a means for detecting an overflow of said buffer memory; a means for prohibiting said communication cell data from being written into said buffer memory according to said overflow detection; and a means for setting a write address lower than a write address of said communication cell data being written in said buffer memory as a writing start address for said communication cell data received next according to said overflow detection.
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Specification