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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM5352 датащи(PDF) 21 Page - PMC-Sierra, Inc |
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PM5352 датащи(HTML) 21 Page - PMC-Sierra, Inc |
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21 / 77 page  PM5352 S/UNI STAR DATA SHEET PMC-1990421 ISSUE 2 SATURN USER NETWORK INTERFACE 155 (STAR) PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 17 Pin Name Type Pin No. Function TSOP Input (POS) J21 POS-PHY Transmit Start of Packet (TSOP) signals. TSOP indicates the first word of a packet. TSOP is required to be present at the beginning of every packet for proper operation. TSOP is considered valid only when TENB is simultaneously asserted and the S/UNI-STAR is selected via TADR[2:0]. TSOP is sampled on the rising edge of TFCLK. TENB Input (ATM) J22 UTOPIA Transmit Multi-PHY Write Enable (TENB) signal. The TENB signal is an active low input which is used along with the TADR[2:0] inputs to initiate writes to the transmit FIFO’s. TENB works as follows. When sampled high, no write is performed, but the TADR[2:0] address is latched to identify the transmit FIFO to be accessed. When TENB is sampled low, the word on the TDAT bus is written into the transmit FIFO that is selected by the TADR[2:0} address bus. A complete 53 octet cell must be written to the transmit FIFO before it is inserted into the transmit stream. Idle cells are inserted when a complete cell is not available. While TENB is deasserted, TADR[2:0] can be used for polling TCA. TENB is sampled on the rising edge of TFCLK. |
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