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TNETX4090GGP 数据表(PDF) 9 Page - Texas Instruments |
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TNETX4090GGP 数据表(HTML) 9 Page - Texas Instruments |
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9 / 78 page  TNETX4090 ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) 100-/1000-Mbit/s MAC interface [physical media attachment (PMA) mode] TERMINAL NAME I/O INTERNAL RESISTOR DESCRIPTION M08_COL I Pulldown Receive byte clock 1. M08_COL is used to input receive byte clock 1 from the attached SERDES device. M08_CRS I Pulldown Unused. This terminal can be left unconnected. M08_EWRAP O None Enable wrap. Output to attached SERDES device used to enable loopback testing of that device. M08_EWRAP is asserted when loopback in PCSxControl = 1. M08_GTCLK O None Transmit clock. Transmit clock output to attached SERDES device. M08_LINK I Pulldown Signal detect. This can be connected to the signal detect output from the external SERDES device. – If M08_LINK = 0, there is no signal. – If M08_LINK = 1, signal is present. M08_LREF O None Lock to reference. M08_LREF is asserted low during hard reset or when lckref in PortxControl = 1. It is used by the external SERDES device to lock to its reference clock. M08_RCLK I Pullup Receive byte clock 0. M08_RCLK is used to input receive byte clock 0 from the attached SERDES device. M08_RFCLK I Pullup Reference clock. Reference clock, used as the clock source for the transmit side of this port and to generate M08_GTCLK. M08_RFCLK provides the clock source for the entire internal PCS sublayer. M08_RXD7 M08_RXD6 M08_RXD5 M08_RXD4 M08_RXD3 M08_RXD2 M08_RXD1 M08_RXD0 I Pullup Receive data. Least significant eight bits of the 10-bit receive code group. Even-numbered code groups are latched with M08_COL, and odd-numbered code groups are latched with M08_RCLK. M08_RXDV I Pulldown Receive data valid. M08_RXDV is used to receive the 9th bit of the 10-bit PMA code groups. Even-numbered code groups are latched with M08_COL, and odd-numbered code groups are latched with M08_RCLK. M08_RXER I Pulldown Receive error. M08_RXER is used to receive the 10th bit of the 10-bit PMA code groups. Even-numbered code groups are latched with M08_COL, and odd-numbered code groups are latched with M08_RCLK. M08_TXD7 M08_TXD6 M08_TXD5 M08_TXD4 M08_TXD3 M08_TXD2 M08_TXD1 M08_TXD0 O None Transmit data. Least significant eight bits of the 10-bit transmit code group. Data on these signals is synchronous to M08_GTCLK. M08_TXEN O None Transmit enable. M08_TXEN is used to transmit the 9th bit of the 10-bit PMA code groups. Data on this signal is synchronous to M08_GTCLK. M08_TXER O None Transmit error. M08_TXER is used to transmit the 10th bit of the 10-bit PMA code groups. Data on this signal is synchronous to M08_GTCLK. |
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