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PM5347 Datasheet(PDF) 267 Page - PMC-Sierra, Inc |
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PM5347 Datasheet(HTML) 267 Page - PMC-Sierra, Inc |
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267 / 302 page  PM5347 S/UNI-PLUS DATA SHEET PMC-941033 ISSUE 6 SATURN USER NETWORK INTERFACE PLUS PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 251 The Transmit Synchronous FIFO Timing Diagram (Figure 34) illustrates the operation of the drop side transmit interface. The S/UNI-PLUS indicates that there is space available in the transmit FIFO by asserting the transmit cell available output, TCA. TCA remains high until the transmit FIFO is almost full, full or if an error condition is detected. Almost full implies that the transmit FIFO can accept at most an additional four writes. Selection between almost full and full is made using the TACP FIFO Control register. If TCA is asserted high and the downstream is ready to write a word, the downstream device should assert TWRENB low. At anytime, if the downstream does not have a word to write, it can deassert TWRENB. |
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