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PM5347 数据表(PDF) 41 Page - PMC-Sierra, Inc |
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PM5347 数据表(HTML) 41 Page - PMC-Sierra, Inc |
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41 / 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 25 Pin Name Type Pin No. Function TFCLK Input 67 The transmit FIFO clock (TFCLK) is used to write words to the synchronous FIFO interface. TFCLK must cycle at a 52 MHz or lower instantaneous rate. TWRENB, TSOC, TXPRTY[1:0] and TDAT[15:0] are sampled on the rising edge of TFCLK. In addition, TCA is updated on the rising edge of TFCLK. TWRENB Input 68 The active low transmit write enable input (TWRENB) is used to initiate writes to the transmit FIFO. When sampled low using the rising edge of TFCLK, the 16-bit word on TDAT[15:0] is written into the transmit FIFO. When sampled high using the rising edge of TFCLK, no write is performed. A complete 53 octet cell must be written to the FIFO before it is inserted into the STS-3c/1 (STM- 1) SPE. Idle/unassigned cells are inserted when a complete cell is not available. |
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