Time division multiplexed synchronous state machine having state memory
First Claim
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1. A receive SONET line interface, comprising:
- a pointer tracking circuit (122), responsive to a SONET signal (108) and a previous state pointer tracking signal (129c), for providing a data signal (118a) at a line clock (110) rate and for providing a next state pointer tracking signal (129a);
a line side state memory (126), responsive to said next state pointer tracking signal (129a) and to a line side write address signal, for storing said next state pointer tracking signal (129a) for a selected period and responsive to a line side read address signal (126b), for providing said previous state pointer tracking signal (129c) after said selected period;
an elastic store (102), responsive to said data signal at said line clock rate and to an elastic store write address signal (102a), for storing said data signal (118a) and responsive to an elastic store read address signal (102b), for providing a data signal (120a) at a local clock (114) rate;
a pointer generating circuit (124), responsive to said data signal (120a) at a local clock rate and responsive to a previous state pointer generating signal (129d), for providing a data signal (121a) having pointer value and adjustments and a next state pointer generating signal (129b); and
a local side state memory (128), responsive to said next state pointer generating signal (129b) and to a write address signal (128a), for storing said next state pointer generating signal (129b) for said selected period and responsive to a local side read address signal (128b), for providing said previous state pointer generating signal (129d).
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Abstract
A receive SONET line interface includes an elastic store which receives and stores incoming signals from a pointer tracking circuit and retrieves stored signals for providing to a pointer generating circuit wherein, for both the pointer tracking and pointer generating circuits, separate state memories are provided for keeping track of the state of previous state pointer tracking and generating signals in time slots of repetitive frames of an incoming SONET signal.
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1 Claim
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1. A receive SONET line interface, comprising:
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a pointer tracking circuit (122), responsive to a SONET signal (108) and a previous state pointer tracking signal (129c), for providing a data signal (118a) at a line clock (110) rate and for providing a next state pointer tracking signal (129a); a line side state memory (126), responsive to said next state pointer tracking signal (129a) and to a line side write address signal, for storing said next state pointer tracking signal (129a) for a selected period and responsive to a line side read address signal (126b), for providing said previous state pointer tracking signal (129c) after said selected period; an elastic store (102), responsive to said data signal at said line clock rate and to an elastic store write address signal (102a), for storing said data signal (118a) and responsive to an elastic store read address signal (102b), for providing a data signal (120a) at a local clock (114) rate; a pointer generating circuit (124), responsive to said data signal (120a) at a local clock rate and responsive to a previous state pointer generating signal (129d), for providing a data signal (121a) having pointer value and adjustments and a next state pointer generating signal (129b); and a local side state memory (128), responsive to said next state pointer generating signal (129b) and to a write address signal (128a), for storing said next state pointer generating signal (129b) for said selected period and responsive to a local side read address signal (128b), for providing said previous state pointer generating signal (129d).
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Specification
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Current AssigneeAlcatel Network Systems India Limited (Nokia Corporation)
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Original AssigneeAlcatel Network Systems India Limited (Nokia Corporation)
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InventorsWeeber, William B., Baydar, Ertugrul, Demiray, Sahabettin C.
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Primary Examiner(s)Safourek, Benedict V.
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Application NumberUS08/783,197Time in Patent Office608 DaysField of Search370/468, 370/503, 370/509, 370/516, 370/517, 375/354, 375/362, 375/371, 375/372US Class Current370/517CPC Class CodesH04J 3/0623 Synchronous multiplexing sy...
