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NWK933TP1N Datasheet(PDF) 2 Page - Mitel Networks Corporation |
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NWK933TP1N Datasheet(HTML) 2 Page - Mitel Networks Corporation |
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2 / 18 page  2 NWK933 Figure 2Pin connections TP64 48 MINT 47 DVDD3 46 MDC 45 MDIO 44 DGND3 43 RefCLK 42 OSCVDD 41 XTAL1 40 XTAL2 39 OSCGND 38 TXGND4 37 TXVDD4 36 TXREF100 35 TXREF10 34 TXVDD3 33 TXGND3 RXGND2 16 RXVDD2 15 RESETN 14 PA4 13 SPDST 12 FDST 11 RXGND3 10 RXVDD3 9 DVDD1 8 COLST 7 ACTST 6 LNKST 5 TX_EN 4 DGND1 3 TX_ER 2 SUBGND2 1 Functional Description The NWK933 has three basic modes of operation: 10BASE-T, 100BASE-TX and LOW POWER modes. The Control block is designed to manage these modes by starting and stopping the 10M and 100M transceivers in a well-controlled manner such that no spurious signals are output on either the MII or twisted-pair interfaces. Furthermore, it continuously monitors the behaviour of the transceivers and takes corrective action if a fault is detected. Other modes described herein are repeater mode and reset mode. 25MHz Reference Clock The NWK933 requires a 25MHz +/-100ppm timing reference for 802.3 compatible operation. This may be supplied either from the integrated oscillator or from an external source. When the integrated oscillator is used, a suitable crystal must be connected across the XTAL1 & XTAL2 pins (see “External Components”) and REFCLK must be tied low. When an external source is used, it must be input to the REFCLK pin and XTAL1 must be tied low. XTAL2 must be unconnected. 10Base-T Operation 10Mb/s Data Transfer on the MII 10Mb/s data is transferred across the MII with clock speeds of 2.5MHz. The MAC outputs data to the NWK933 via the MII interface, on the TXD[3:0] bus. This data is synchronised to the rising edge of TX_CLK. To indicate that there is valid data for transmission on the MII, the MAC sets the TX_EN signal active. This forces the NWK933 device to take in the data on the TXD[3:0] bus. This is serialised and directly encoded as Manchester data, before being output on the TXOP/ TXON differential output for transmission through 1:Ö2 magnetics and onto the twisted-pair. The transmit current is governed by the current through the TXREF10 pin, which must be grounded through a resistor as described in “External Components”. RX10 Clock Recovery The NWK933 employs a digital delay line controlled by the 100MHz Synthesizer DLL to derive a sampling clock from the incoming signal. The recovered clock runs at twice the data rate (nominally 20MHz). When a signal is received from the Signal Detect block, it is used to strobe Link Pulses and Manchester encoded serial data. |
Similar Part No. - NWK933TP1N |
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Similar Description - NWK933TP1N |
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