DP83869HMRGZR IC

DP83869HMRGZR Description

Supporting 10BASE-Te, 100BASE-TX, and 1000BASE-T Ethernet protocols, the DP83869HM is a high-performance, powerful, PMD sublayer-integrated gigabit physical layer (PHY) transceiver. The DP83869 is compatible with the 100BASE-FX and 1000BASE-X fiber standards. The DP83869HM is an ESD protector that is more powerful than the 8 kV required by the International Electrotechnical Commission (IEC) (direct contact).

This device uses both reduced GMII (RGMII) and symmetric GMII (SGMII) to connect to the MAC layer. If the device is set to 100M mode, the designer can use MII to reduce latency. Using RGMII or MII with programmable integrated termination impedance can lower the system’s bill of materials (BOM). The media conversion process can be performed in unmanaged mode on the DP83869HM. In this configuration, the DP83869HM is capable of converting between 1000BASE-X and 1000BASE-T as well as 100BASE-FX and 100BASE-TX. The DP83869HM is capable of bridge conversion between RGMII and SGMII as well as the other way around. The DP83869HM has minimal latency and conforms to TSN specifications.

DP83869HMRGZR Features

• More than 8 kV ESD IEC61000-4-2. with the Time Sensitive Network (TSN).
• Recovered clock output for SyncE
• Support for IEEE 1588 is available through SFD.
• Wake up for LAN assistance.
• Voltages for configurable IO: 1.8, 2.5, and 3.3 V.
• MAC interfaces for SGMII, RGMII, and MII.
• Support for 1000M and 100M speeds in jumbo frames.

DP83869HMRGZR Detailed Description

Moreover, the DP83869HM may produce MAC signals for IEEE 1588 Sync Frame Detection. This can reduce the jitter in time synchronization and help the system account for delayed receipts that arrive at different times. On the first page, a block diagram of a typical Ethernet system is displayed. The DP83869 can be used by designers in three different ways: as a media converter, an RGMII-to-SGMII bridge, or an SGMII-to-RGMII bridge.

DP83869HMRGZR Detailed Description

The DP83869HM supports both copper and fiber Ethernet standards. It can do everything a full-fledged gigabit-class physical layer transceiver can do.  802.3 10BASE-Te, 100BASE-TX, and 1000BASE-T copper Ethernet standards, as well as fiber-based Ethernet technologies such as 100BASE-FX and 1000BASE-X, are all supported. The DP83869HM makes it easy to set up Ethernet local area networks with speeds of 10, 100, or 1000 megabits per second. Once the PHY is set to copper mode, it can use magnetics to connect to twisted-pair media.

To communicate with other devices that use optical fiber, switch to Fiber Mode. Reduced GMII (RGMII) or serial GMII makes it possible for this device to talk directly to the SGMII MAC layer. Copper Ethernet is the only connectivity option for SGMII. Both 10M and 100M MII modes are supported. The DP83869HM can act as a media converter, translating between copper and fiber Ethernet.

There is a media converter that can switch between 100M and 1000M. The DP83869HM can also connect the SGMII and RGMII systems by acting as a bridge. There is little lag time with the DP83869HM. It provides the Start of Frame Delimiter signal as laid out in IEEE 1588. Synchronous Ethernet applications can take advantage of the device’s recovered clock if desired. The DP83869HM’s TDR cable diagnostic function allows for Ethernet cable fault detection.

Feature Description

Identifying “WoL” (or “Wake-on-LAN”) Packets Wake-on-LAN makes it possible to find certain frames and then let the connected MAC know about them by changing the state of a register, sending a signal through a GPIO, or setting an interrupt flag. The WoL function of the DP83869HM lets devices that work above the physical layer save power by going into a low-power sleep mode until frames with the right credentials are found.

WoL frames like Magic Packet, Magic Packet with SecureOn, and Custom Pattern Match are all supported. The DP83869HM WoL logic circuit can let a connected controller know about a wake event by sending a user-defined event (pulses or a change in level) over any of the GPIO pins or clock. By decoding the data stream of received Ethernet packets, the partner’s receive clock can be made to match the transmit clock. By setting up the DP83869HM’s I/O Configuration register (address 170h), the CLK OUT pin can be used to access these internal clocks. If you plug in an XI oscillator or crystal, the output clock will automatically match it.

When another DP83869HM device is connected, the default output clock can be used as the reference clock for that other device. You can sync the output clock with the data you receive at either 125 MHz or 25 MHz, which you get by dividing 125 MHz by 5. Registers are the means of achieving this. It can also be set up to provide the transmit clock for the line driver. In 1000Base-T mode, the output clock can be set independently for each of the four channels used for sending and receiving data. Note that the primary DP83869HM should not be reset via the RESET pin if its clock output is being used as the clock input for another device, such as two DP83869HM connected in a daisy chain. It is recommended that all necessary resets be carried out in software. The CLK O DISABLE bit in the I/O Configuration register turns off the output clock.

● BIST Configuration

For in-circuit testing or diagnostics, the device has a PRBS Built-In Self-Test (BIST) circuit. Both the send and receive data paths can be checked using the BIST circuit. Internal loopback (digital or analog) and exterior loopback (using a cable fixture) can both be used to carry out the BIST. The BIST fakes data transfers by sending pseudo-random data in real packets and putting an Inter-Packet Gap (IPG) between the packets on the lines. Full command over packet sizes and the IPG is available via the BIST. The BIST is made with separate send and receive paths, and its send block sends out a steady stream of pseudo-random sequences.

For the BIST, the gadget produces a pseudo-random sequence of 15 bits. A linear feedback shift register (LFSR) compares the data coming in to a stream of pseudo-random numbers made by the BIST to see if the BIST passed or not. To keep track of how many bad bytes the PRBS checker has seen, it uses the PRBS TX CHK CTRL register (39h). Using the GEN STATUS2 register, you can find out if the PRBS checker is locked to the incoming receive bit stream, if the PRBS has lost sync, and if the packet generator is busy (17h).

Even though the lock and sync signals are needed to tell if data reception has started properly, the error counter in the PRBS TX CHK CTRL register is the best way to tell if a link has failed or if data has been messed up (39h). PRBS TX CHK BYTE CNT stores the number of bytes checked in for delivery (3 AH). Using the BIST CONTROL register, the PRBS t3 AH can be switched to a continuous mode (16h). In continuous mode, counting starts over from zero when it cannot be used in braille.

Conclusion

In conclusion, the DP83869HM stands out as a highly capable and reliable gigabit physical layer (PHY) transceiver that works well with multiple Ethernet protocols. Its programmable termination impedance makes it easy to add to Ethernet LANs and cuts down on the cost of the system. The DP83869HM is a versatile solution for media and bridge conversion applications. It works with TSN, protects against ESD up to 8 kV (IEC 61000-4-2), has low latency, supports IEEE 1588, and can wake up a computer from a LAN. If you want to purchase this device or other components for your project, ICRFQ is the trusted supplier with high-quality products and top-notch customer service.

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