VT6516 datasheet(30/73 Pages) ETC

30 / 73 page

VIA Technologies, Inc.

Preliminary VT6516 Datarsheet

-30-

3.1.4 Network interface

The VT6516 directly connect to 16 port RMII PHY or 12 port MII PHY device which compliant with

IEEE standard (Please see IEEE 802.3u Fast Ethernet standard) . Each Fast Ethernet port has following

characteristics:

Capable of supporting both 10MBps and 100MBps data rates in half and full duplex modes.

Provide a simple management interface (SMI) for port status

Perform all functions of the IEEE 802.3 protocol such as frame formatting, frame stripping, collision

handling, deferred, etc.

Adjustable preamble ,SFD and inter frame gap (IFG).

IEEE 802.3X flow control supported

IEEE 802.1D spanning tree protocol support, and all port state of listen and block configurable

3.1.4.1 RMII interface

The VT6516 communicates with the external 10/100M Ethernet transceiver through the reduced MII

(RMII) interface. The signals of RMII interface are described in Table-3-1

Table 3-1 RMII interface signals

Name

Type

Description

CRSDV

Carrier sense and Data

valid

RXD[0-1]

Receive data bit 0 to 1 ,

data rate with 50MHz

TXEN

Transmit Enable

TXD[0-1]

Transmit Data bit 0 to

Figure 3-1 RMII timing diagram

(omitted)

VT6516 Datasheet(PDF) 30 Page - List of Unclassifed Manufacturers