Technical Datasheet: DMEP Datasheet Through the Media Independent Interface (MII), the DM connects to the Medium Access Control (MAC) layer, . Details, datasheet, quote on part number: DM Company, Davicom Semiconductor Incorporated. Datasheet, Download DM datasheet. Quote. DM Datasheet PDF Download – 10/ Mbps FAST ETHERNET PHYSICAL LAYER SINGLE CHIP TRANSCEIVER, DM data sheet.

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This pin is always pulled low except used as reduced MII. 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. Link partner auto-negotiation able: If this bit is 1, it means the operation 1 mode is a 10M half duplex mode. The transformers listed in Table 2 are electrical equivalents, but may not be pin-to-pin equivalents.

When auto-negotiation is disabled bit 12 of this register clearedthis bit has no function and it should be cleared.

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Collision detection is disabled in Full Duplex operation. 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.

Link partner, no next page Local device next page able: Reset Active low input that initializes the DM Writing a 1 to this bit will cause PHY entering the Sleep mode and power down all circuit except oscillator and clock generator circuit. MF preamble suppression control: Adaptive Equalizer When transmitting data at high speeds over copper twisted pair cable, attenuation based on frequency becomes a concern.

A1 is defined as the distance from the seating plane to the lowest point of the package body. This bit is self-clearing and it will keep returning a value of 1 until autonegotiation is initiated by the DM Speed status change interrupt: Data processed for transmit is presented to the MII interface in nibble format, converted to a serial bit stream, then Manchester encoded.


When this bit is set to 1, the received data will loop out to the transmit channel. This bit, which is self-clearing, will keep returning a value of one until the reset process is completed Loopback: Descrambler Because of the scrambling process required to control the radiated emissions of transmit data streams, the receiver must descramble the receive data streams. 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.

F electrolytic bypass capacitors should be connected between VCC and Ground at each side of the ferrite bead. Software should not attempt to write to this bit. Integrated circuits sold by DAVICOM Semiconductor are covered by the warranty and patent indemnification provisions stipulated in the terms of sale only.

Collision Detection Asserted high to indicate the detection of the collision conditions in 10Mbps and Mbps half-duplex mode.

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Serial Management Interface The serial control interface uses a simple two-wired serial interface to obtain and control the status of the physical layer through the MII interface. If the pin is pulled high, the LED is active low after reset. Auto-Negotiation The objective of Auto-negotiation is to provide a means to exchange information between segment linked devices and to automatically configure both devices to take maximum advantage of their abilities.

This bit shows the same result as bit 0. Binary plus Binary In. datasheet

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Four bits of vendor model revision number mapped to bit 3 to 0 most significant bit to bit 3 24 Final Version: DM, no next page DM does not support this function, so this bit is always 0. 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.


Products described herein are intended for use in normal commercial applications. LI Active states indicate Full-duplex mode. Shipment is only possible to Germany, Austria and Switzerland. This clock is provided by management entity, and it is up to 2.

Reserved Duplex status change interrupt: This register stores bit 3 to 18 of the OUI E to bit 15 to 0 of this register respectively. The Clock Recovery Module locks onto the data stream and extracts the Mhz reference clock. These two busses include various controls and signal indications that facilitate data transfers between the DM and the Reconciliation layer. 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.

While in the power-down state, the PHY should respond to management transactions. Connecting 2 Davicom devices without transformers. The MDIO pin is bi-directional and may be shared by up to 32 devices. Dimensions b does not include dambar protrusion.

Differential data is received from the media. The auto-negotiation status will be written to these bits. If this bit is 1, it means the operation 1 mode is a M full duplex mode. Re-initiates the auto-negotiation process. In repeater mode or full-duplex mode, this signal is asserted high to indicate the presence of carrier due to receive activity only. Keep chassis ground away from all active signals.

In repeater application, this pin may be connected to a repeater controller.