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AM79761YC-14 データシート(PDF) 7 Page - Advanced Micro Devices |
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AM79761YC-14 データシート(HTML) 7 Page - Advanced Micro Devices |
7 / 20 page Am79761 7 PRELIMINARY PIN DESCRIPTION TX+, TX- Serial Transmit Data PECL Output These pins are the 1000BASE-X port differential driv- ers which transmit the serial stream to the network. These pins are connected to the copper or fiber optic connectors. When EWRAP is LOW, the pins assume normal oper- ation. When HIGH, TX+ is logic HIGH and TX- is logic LOW. RX+, RX- Serial Receive Data PECL Input These pins are the 1000BASE-X port differential re- ceiver pair, receiving a serial stream of data from the network. These pins are connected to the copper or fiber optic connectors. When EWRAP is LOW, the pins assume normal oper- ation. The pins are internally biased. TXD[0:9] Transmit Data TTL Input The TXD[0:9] pin is a set of 10 data signals which are driven from the Physical Coding Sublayer (PCS) above. The 10 bits of data are clocked in parallel on the rising edge of REFCLK. TXD0 is transmitted first on TX ±. RXD[0:9] Receive Data TTL Output The RXD[0:9] pin is a set of 10 data signals which are sent to the Physical Coding Sublayer (PCS) above. The 10 bits of data are clocked out in parallel on the rising edges of RCLK and RCLKN. RXD0 is received first on RX ±. REFCLK Reference Clock TTL Input This input is used for the 125-Mhz clock. The rising edge of this clock latches TXD[0:9] into an input regis- ter. This clock serves as the reference clock at 1/10th the baud rate for the PLL. RCLK, RCLKN Receive Clock TTL Output These pins provide the differential receive clock sig- nals, derived from the RX ± data stream, and are at 1/20th the baud rate of the receive stream. Parallel data on RXD[0:9] is provided at each rising transition of RCLK and RCLKN. EN_CDET Enable Comma Detect TTL Input This pin is used to enable the word synchronization mode. When logic HIGH, the COM_DET output is en- abled and word synchronization is active. COM_DET Comma Detect Indicator TTL Output Comma Detect is asserted to indicate that the incoming word on RXD[0:9] contains a Comma character (0011111xxx). COM_DET goes HIGH for half of a RCLK period, and can be captured when RCKLN is rising. In order for COM_DET to provide indication, EN_CDET must be enabled (logic HIGH). EWRAP Loopback Enable TTL Input When EWRAP is asserted, the transmitted data stream is sent back to the receiver through an internal loop- back path. TX+ is logic HIGH, and TX- is logic LOW in this mode. This pin is logic LOW for normal operation. TEST[1:3] Factory Test Pins Input These pins should be tied to DVDD for normal operation. TEST[4] Factory Test Pin Output This pin should be left unconnected for normal operation. DVDD Power These pins supply power to the digital blocks of the device. They must be connected to a 3.3 V ±5% source. DVDD_T TTL Power These pins supply power to the TTL blocks of the de- vice. They must be connected to a 3.3 V ±5% source. DVDD_P PECL Power These pins supply power to the PECL blocks of the de- vice. They must be connected to a 3.3 V ±5% source. It is critical that the signal supplied to these pins are clean to ensure good performance of the device. |
同様の部品番号 - AM79761YC-14 |
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同様の説明 - AM79761YC-14 |
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