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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The 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.

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 from ” https: Carrier sense is high when transmitting, receiving, or the medium is otherwise sensed as being in use. Sspecification media-independent interface MII was originally defined as a standard interface to connect a Fast Ethernet i. However, at 1 ns edge rates a trace longer than about 2.

gmio The receive clock is recovered from the incoming signal during frame reception. Given trends in the gkii industry and the fact that both ICs are usually on the same board, lack specificatiom 5 V tolerance is probably very common, and chips that actually drive 5 V are probably even rarer. Archived from the original on This arrangement specificationn the MAC to operate without having to be aware of the link speed. Drivers should be able to drive 25 pF of capacitance which allows for PCB traces up to 0.

Typically used for on-chip connections; in chip-to-chip usage mostly replaced by XAUI. More recently, raising transmit error outside frame transmission is used to indicate the transmit data lines are being used for special-purpose signalling.


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. The MAC may omit the signal if it has no use for this functionality, in which case the signal should be tied low for the PHY.

This means a slight modification of the definition of CRS: The RMII signals are treated as lumped signals rather than transmission lines; no termination or controlled impedance is necessary; output drive and thus slew rates need to be as slow as possible rise times from 1—5 ns to permit this. Received clock signal recovered from incoming received data. gmui

There are 32 addresses, each specificaton 16 bits. From Wikipedia, the free encyclopedia. Four things were changed compared to the MII standard to achieve this:.

As such it consists of a preamble, start frame delimiter, Ethernet headers, protocol specific data and a cyclic redundancy check CRC.

Retrieved 20 April This page was last edited on 19 Novemberat Current revisions of IEEE The standard MII features a small set of registers: At power up, using autonegotiationthe PHY usually adapts to whatever it is connected to unless settings are altered via the MDIO interface.

The first 16 addresses have a defined usage, [7] while the others are device specific. The original MII design has been extended to support reduced signals and increased speeds. This requires specificayion PCB to be designed to add a 1.

Media-independent interface

At least the standard says the signals need not be treated as transmission lines. Data is sampled on the rising edge only i. By using this site, you agree to the Specificcation of Use and Privacy Policy. It is not to be confused with RM2. It contains a bitmask with the following meaning: 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 specjfication way that precludes it from being received as valid.


Ethernet Computer buses Serial buses. Ethernet family of local area network technologies. Transmit and receive path each use one differential pair for data and another differential pair for clock. For receive, two data values are defined: Input high threshold is 2. Some of the preamble nibbles may be lost. The transmit enable signal is held high during frame transmission and low when the transmitter is idle.

Being media independent means that different types of PHY devices for connecting to different media i. The receiver clock is much simpler, with only one clock, which is recovered from the incoming data. Source-synchronous clocking is used: Views Read Edit View history.

The management interface controls the behavior of the PHY. The original MII transfers network data using 4-bit nibbles in each direction 4 transmit gmij bits, 4 receive data bits. When no clock can be recovered i.

Reference clock may be an input on both devices from an external clock source, or may be driven from the MAC to the PHY.