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 first 16 addresses have a defined usage, [7] while the others are device specific.

For this reason, the reduced media independent interface was developed. The management interface controls the behavior of the PHY. However, at 1 ns edge rates a trace longer psecification about 2. The standard MII features a small set of registers: From Wikipedia, the free encyclopedia. Ethernet Computer buses Serial buses. Being media independent means that different types of PHY devices for connecting to different media i.

Media-independent interface

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. 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 specificaiton be as slow as possible rise times from 1—5 ns to permit this.


It contains a bitmask with the following meaning: When no gmli can be recovered i. 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 specificatiom. 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.

At specitication the standard says the signals need not be treated as transmission lines. This arrangement allows the MAC to operate without having to be aware of the link speed.

By using this site, you agree to the Terms of Use and Privacy Policy. Archived from the original on Transmit and receive path specifjcation use one differential pair for data and another differential pair for clock. TTL signal levels are used for 5 V or 3.

There is dpecification 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

For receive, two data values are defined: 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. This interface requires 9 signals, versus MII’s As such it consists of a preamble, start frame delimiter, Ethernet headers, protocol specific data and a cyclic redundancy check CRC.


The original MII design has been extended to support reduced signals and increased speeds. This page was last edited on 19 Novemberat Views Read Edit View history. It is not to be confused with RM2.

The original MII transfers network data using 4-bit nibbles in each direction 4 transmit data bits, 4 receive data bits. Ethernet family of local area network technologies.

This may be used to abort a frame when some problem is detected after transmission has already started. Some of the preamble nibbles may be lost. Current revisions of IEEE Retrieved 20 April Carrier sense is high when transmitting, receiving, or specificatiion medium is otherwise sensed as being in use.

The transmit enable signal is held high during frame transmission and low when the transmitter is idle. More recently, raising transmit error outside frame transmission is used to indicate the transmit data lines are being used for special-purpose signalling.

This means a slight modification of the definition of CRS: