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PM73121 Datasheet(PDF) 79 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 79 Page - PMC-Sierra, Inc |
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79 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ Figure 46 shows the state machine that checks for valid pointers and structures. 3.6.4 Overrun Overrun occurs when the data in the buffer is removed at a slower rate than it is filled. However, because the AAL1gator II buffers are quite large, 16 kBytes per line, by the time this happens, all data in the buffer can be quite old. Therefore, the buffer size is adjustable, which regulates how much data can be stored in the buffer before an overrun occurs. The R_MAX_BUF field in the R_ MAX_BUF register controls the maximum size of the receive buffer. The value of R_MAX_BUF should be equal to or greater than two times CDVT, or two times the number of frames required per cell, whichever is greater. The overrun condition is declared when the data in the receive buffer exceeds the maximum spec- ified buffer size (refer to “R_MAX_BUF Word Format” on page 157). When a cell is received that causes the maximum buffer depth to be exceeded, the OVERRUN sticky bit is set and the AAL1gator II enters the forced underrun condition. The incoming cells for the queue are dropped until underrun occurs. Each time a cell is received and dropped in the forced underrun condition, Figure 46. Pointer/Structure State Machine Pointer does not match prediction (or parity bad and checking parity) or out-of-sequence or invalid cell received Non-dummy pointer found and parity good (or not checking parity) No pointer found Structure Found Underrun or force-underrun Underrun or force-underrun Structure found Pointer does not match prediction or underrun or force-underrun (or checking parity and Pointer matches prediction and parity good (or not checking parity) Pointer matches prediction and parity good (or not checking parity) Pointer Found Underrun One Mismatch (Signaling is not updated) |
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