The KSZMNX offers the industry-standard GMII/MII Media Independent Interface (GMII) is compliant to the IEEE Specification. Dave Fifield [email protected] GMII Electrical Specification IEEE Interim Meeting, San Diego, January N. Interface) for connection to GMII/MII MACs in Gigabit . Clarified power cycling specification to have all supply voltages to the KSZMNX.

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Ethernet Computer buses Serial buses. This arrangement allows the MAC to operate without having to be aware of the link speed.

Received clock signal recovered from incoming received data. The receiver clock is much simpler, with only one clock, which is recovered from the incoming data. Retrieved from ” https: When no clock can be recovered i. This may be used to abort a frame when some problem is detected after transmission has already started. The transmit enable signal is held high during frame transmission and low when the transmitter is idle.

There is no signal which defines whether the interface is in full or half duplex mode, but both the MAC and the PHY need to agree.

Media-independent interface – Wikipedia

Retrieved 20 April On the other hand, newer devices may support 2. Views Read Edit View history.

Carrier sense is high when transmitting, receiving, or the medium is otherwise sensed as being in use. Gimi specification states that inputs should be 5 V tolerant, however, some popular chips with RMII interfaces are not 5 V tolerant. TTL signal levels are used for 5 V or 3. Specificaton receive, two data values are defined: Given trends in the semiconductor industry and the fact that both ICs are usually on the same board, lack of 5 V tolerance is probably very common, and chips that actually drive 5 V are probably even rarer.


Ethernet family of local area network technologies. The management fmii controls the behavior of the PHY. As such it consists of a preamble, start frame delimiter, Ethernet headers, protocol specific data and a cyclic redundancy check CRC. Transmit error may be raised for one or more clock periods during frame transmission to request the PHY to deliberately corrupt the frame in some visible way that precludes it from being received as valid.

The media-independent interface MII was originally defined as a standard interface to connect a Fast Ethernet i. The standard MII features a small set of registers: The receive clock is recovered from the incoming signal during frame reception. Reference clock may be an input on both devices from an external clock source, or specificatiob be driven from the MAC to the PHY. Data is sampled on the rising edge only i. At power up, using autonegotiationthe PHY usually adapts to whatever it is connected to unless settings are altered via the MDIO interface.

Media-independent interface

This requires the PCB to be designed to add a 1. For this reason, the reduced media independent interface hmii developed. The first 16 addresses have a defined usage, [7] while the others are device specific.


By using this site, you agree to the Terms of Use and Privacy Policy. Input high threshold is 2. It contains a bitmask with the following meaning: There are 32 addresses, each containing 16 bits. The original MII design has been extended to support reduced signals and increased speeds.

Archived from the original on More recently, raising transmit error outside frame transmission is used to indicate the transmit data lines are being used for special-purpose signalling.

The RMII signals are treated as lumped signals rather than transmission lines; no termination or controlled impedance is necessary; output drive and thus g,ii rates need to be as slow as possible rise times from 1—5 ns to permit this.

If a collision is detected, COL also goes high while the collision persists. These registers can be used to configure the device say “only gigabit, full duplex”, or “only full duplex” or can be used to determine the current operating mode.

Being media independent means that different types of PHY devices for connecting to different media i. This interface requires 9 signals, versus MII’s Current revisions of IEEE