DAVICOM DM9161 PDF

Mugal Due to the built-in wave-shaping filter, the DM does not need any external filters to transport signals to the media in M or 10M Ethernet operations. DM can internally generate the 50MHz reference clock or alternatively use use the external 50MHz system clock. Sense Store Connect Other. If the samples you request exceed this amount we will contact you and show you the available options. Wireless Low Power Tranceivers. The power-down mode, selectacle 1: Shipment is only possible to Germany, Austria and Switzerland.

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The DM provides a strong support for the autonegotiation function, utilizing automatic media speed and protocol selection. General Description Block Diagram Pin Description LED Configuration Functional Description MII Register Description Application Notes Package Information Order Information Single low power Supply of 3.

Compatible with 3. This clock is provided by management entity, and it is up to 2. In repeater mode or full-duplex mode, this signal is asserted high to indicate the presence of carrier due to receive activity only This pin is also used as PHYAD [4] power up reset latch input PHY address sensing input pin Collision Detection Asserted high to indicate the detection of the collision conditions in halfduplex mode of 10Mbps and Mbps.

Active low on this input tri-states these output pins. In node application, this pin should be pulled high.

In repeater application, this pin may be connected to a repeater controller Reset Active low input that initializes the DM For debug only OP1: power up reset latch input This pin is used to control the forced or advertised operating mode of the DM according to the Table A.

All LED pins are dual function pins, which can be configured as either active high or low by pulling them low or high accordingly. If the pin is pulled high, the LED is active low after reset. Likewise, if the pin is pulled low, the LED is active high. Figure 1 shows the major functional blocks implemented in the DM The MII consists of a nibble wide receive data bus, a nibble wide transmit data bus, and control signals to facilitate data transfers between the PHY and the Reconciliation layer.

If TXER is asserted for one or more clock periods, and TXEN is asserted, the PHY will emit one or more symbols that are not part of the valid data delimiter set somewhere in the frame being transmitted. To interpret a receive frame correctly by the reconciliation sublayer, RXDV must encompass the frame, starting no later than the Start-of-Frame delimiter and excluding any End-Stream delimiter.

RXER will be asserted for 1 or more clock periods to indicate to the reconciliation sublayer that an error was detected somewhere in the frame being transmitted from the PHY to the reconciliation sublayer. CRS carrier sense is asserted by the PHY when either the transmit or receive medium is non-idle, and deasserted by the PHY when the transmit and receive medium are idle.

The on-chip clock circuit converts the 25MHz clock into a MHz clock for internal use. The IEEE The interface specification defines a dedicated receive data bus and a dedicated transmit data bus. These two busses include various controls and signal indications that facilitate data transfers between the DM and the Reconciliation layer. This conversion is required for control and packet data to be combined in code groups. The 4B5B encoder continues to replace subsequent 4B preamble and data nibbles with corresponding 5B code-groups.

By scrambling the data, the total energy presented to the cable is randomly distributed over a wide frequency range. Without the scrambler, energy levels on the cable could peak beyond FCC limitations at frequencies related to repeated 5B sequences like continuous transmission of IDLE symbols. The result is a scrambled data stream with sufficient randomization to decrease radiated emissions at critical frequencies. Refer to figure for the block diagram of the MLT-3 converter. Binary plus Binary In.

In high speed twisted pair signaling, the frequency content of the transmitted signal can vary greatly during normal operation based on the randomness of the scrambled data stream. This variation in signal attenuation caused by frequency variations must be compensated for to ensure the integrity of the received data. In order to ensure quality transmission when employing MLT-3 encoding, the compensation must be able to adapt to various cable lengths and cable types depending on the installed environment.

The selection of long cable lengths for a given implementation requires significant compensation, which will be over-kill in a situation that includes shorter, less attenuating cable lengths. Conversely, the selection of short or intermediate cable lengths requiring less compensation will cause serious under-compensation for longer length cables. Therefore, the compensation or equalization must be adaptive to ensure proper conditioning of the received signal independent of the cable length.

The Clock Recovery Module locks onto the data stream and extracts the Mhz reference clock. This conversion process must be reversed on the receive end.

The descrambler receives scrambled parallel data streams from the Serial to Parallel converter, descrambles the data streams, and presents the data streams to the Code Group alignment block.

Data processed for transmit is presented to the MII interface in nibble format, converted to a serial bit stream, then Manchester encoded. When receiving, the Manchester encoded bit stream is decoded and converted into nibble format for presentation to the MII interface.

Collision detection is disabled in Full Duplex operation. During full-duplex mode, CRS is asserted only during receive operations. It is important to note that Autonegotiation does not test the link segment characteristics. The Auto-Negotiation function provides a means for a device to advertise supported modes of operation to a remote link partner, acknowledge the receipt and understanding of common modes of operation, and to reject un-shared modes of operation.

This allows devices on both ends of a segment to establish a link at the best common mode of operation. If more than one common mode exists between the two devices, a mechanism is provided to allow the devices to resolve to a single mode of operation using a predetermined priority resolution function.

During Parallel detection there is no exchange of configuration information, instead, the receive signal is examined. If it is discovered that the signal matches a technology, supported by the receiving device, a connection will be automatically established using that technology.

This allows devices, which do not support Auto-negotiation but support a common mode of operation, to establish a link. Through this interface it is possible to control and configure multiple PHY devices, get status and error information, and determine the type and capabilities of the attached PHY device s.

Following the turnaround time, bit data is read from or written onto management registers. The MDIO pin is bi-directional and may be shared by up to 32 devices. In case of cable disconnection,, DM will automatically turn off the power and enter the Power Reduced mode, regardless of its operation mode being N-way auto-negotiation or forced mode.

While in the Power Reduced mode, the transmit circuit will continue sending out fast link pules with minimum power consumption. If a valid signal is detected from the media, which might be N-way fast link pules, 10Base-T normal link pules, or Base-TX MLT3 signals, the device wakes up and resumes normal operation mode. Automatic reduced power down mode can be disabled by writing Zero to Reg.

FDX Cap. Fault Cap. Advertise Link Part. Ability Auto-Neg. Expansion Aux. Reset Pream. Sleep Remote St.

Mch Supr. Re-initiates the auto-negotiation process. When auto-negotiation is disabled bit 12 of this register cleared , this bit has no function and it should be cleared. This bit is self-clearing and it will keep returning to a value of 1 until autonegotiation is initiated by the DM Duplex selection is allowed when Autonegotiation is disabled bit 12 of this register is cleared.

Fault criteria and detection method is DM implementation specific. Jabber conditions will set this bit unless it is cleared by a read to this register through a management interface or a DM reset. Bit 2. Bit 4. Software should not attempt to write to this bit.

Bit 5. When waking up from Sleep mode write this bit to 0 , the configuration will go back to the state before sleep; but the state machine will be reset Remote Loopout Control When this bit is set to 1, the received data will loop out to the transmit channel. This is useful for bit error rate testing If this bit is 1, it means the operation 1 mode is a M full duplex mode. The software can read bit [] to see which mode is selected after auto-negotiation. This bit is invalid when it is not in the auto-negotiation mode M Half Duplex Operation Mode After auto-negotiation is completed, results will be written to this bit.

If this bit is 1, it means the operation 1 mode is a M half duplex mode. This bit is invalid when it is not in the auto-negotiation mode 10M Full Duplex Operation Mode After auto-negotiation is completed, results will be written to this bit. If this bit is 1, it means the operation 1 mode is a 10M Full Duplex mode. This bit is invalid when it is not in the auto-negotiation mode 10M Half Duplex Operation Mode After auto-negotiation is completed, results will be written to this bit.

If this bit is 1, it means the operation 1 mode is a 10M half duplex mode. This bit shows the same result as bit 0.

A read of this register will clear this bit TL, Soldering, 10 sec. These are stress ratings only. Functional operation of this device at these or any other conditions above those indicated that in the operational sections of this specification is not implied.

Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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