Altera Canada Co.

Michael Kenneth Anstey

Wally Haas

The present invention discloses a method of accessing stored information in multi-framed data transmissions, comprising at least one control interface and at least one elastic store, wherein the control interface accesses the elastic store through a mailbox communications method. The control interface accesses the elastic store via the mailbox communications method, which comprises: (a) setting a address for a data location within said elastic store; (b) setting a request to read from, or write to, said data location within said elastic store; (c) issuing a 'GO' signal to retrieve data information from said data location within said elastic store, by writing said 'GO' signal to said microprocessor, which causes a circuit to read from said requested data location within said elastic store; (d) waiting for a possible, but not to be expected, de-assertion of a busy signal to be issued from said data location within said elastic store, and then; and then (e) reading back the value of said data information to said control interface. Where a busy signal occurs, the microprocessor must wait and issue a subsequent &#x201c;GO&#x201d; signal to retrieve the data information from the data location; where a busy signal does not occur the &#x201c;GO&#x201d; signal causes the circuit to read from the requested data location and send the data information hack to the microprocessor, where the data information is stored in a user-accessible register.

Method of accessing stored information in multi-framed data transmissions

The present invention discloses a method of accessing stored information in multi-framed data transmissions, comprising at least one control interface and at least one elastic store, wherein the control interface accesses the elastic store through a mailbox communications method. The control interface accesses the elastic store via the mailbox communications method, which comprises: (a) setting a address for a data location within said elastic store; (b) setting a request to read from, or write to, said data location within said elastic store; (c) issuing a 'GO_' signal to retrieve data information from said data location within said elastic store, by writing said 'GO_' signal to said microprocessor, which causes a circuit to read from said requested data location within said elastic store; (d) waiting for a possible, but not to be expected, de-assertion of a busy signal to be issued from said data location within said elastic store, and then; and then (e) reading back the value of said data information to said control interface. Where a busy signal occurs, the microprocessor must wait and issue a subsequent &#x201c;GO_&#x201d; signal to retrieve the data information from the data location; where a busy signal does not occur the &#x201c;GO_&#x201d; signal causes the circuit to read from the requested data location and send the data information back to the microprocessor, where the data information is stored in a user-accessible register.

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St. John's, Canada

Michael Kenneth Anstey