NWK933CG データシートの表示（PDF） - Mitel Networks

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NWK933CG

3.3V 10/100 Fast Ethernet Transceiver to MII

Mitel Networks 

NWK933

SUBGND2 1

TX_ER 2

DGND1 3

TX_EN 4

LNKST 5

ACTST 6

COLST 7

DVDD1 8

RXVDD3 9

RXGND3 10

FDST 11

SPDST 12

PA4 13

RESETN 14

RXVDD2 15

RXGND2 16

48 MINT

47 DVDD3

46 MDC

45 MDIO

44 DGND3

43 RefCLK

42 OSCVDD

41 XTAL1

40 XTAL2

39 OSCGND

38 TXGND4

37 TXVDD4

36 TXREF100

35 TXREF10

34 TXVDD3

33 TXGND3

TP64

Figure 2Pin connections

Functional Description

10Base-T Operation

The NWK933 has three basic modes of operation:

10BASE-T, 100BASE-TX and LOW POWER modes.

The Control block is designed to manage these modes

by starting and stopping the 10M and 100M transceivers

in a well-controlled manner such that no spurious

signals are output on either the MII or twisted-pair

interfaces. Furthermore, it continuously monitors the

behaviour of the transceivers and takes corrective

action if a fault is detected.

Other modes described herein are repeater mode and

reset mode.

25MHz Reference Clock

The NWK933 requires a 25MHz +/-100ppm timing

reference for 802.3 compatible operation. This may

be supplied either from the integrated oscillator or

from an external source. When the integrated oscillator

is used, a suitable crystal must be connected across

the XTAL1 & XTAL2 pins (see “External Components”)

and REFCLK must be tied low. When an external

source is used, it must be input to the REFCLK pin

and XTAL1 must be tied low. XTAL2 must be

unconnected.

10Mb/s Data Transfer on the MII

10Mb/s data is transferred across the MII with clock

speeds of 2.5MHz. The MAC outputs data to the

NWK933 via the MII interface, on the TXD[3:0] bus.

This data is synchronised to the rising edge of TX_CLK.

To indicate that there is valid data for transmission on

the MII, the MAC sets the TX_EN signal active. This

forces the NWK933 device to take in the data on the

TXD[3:0] bus. This is serialised and directly encoded

as Manchester data, before being output on the TXOP/

TXON differential output for transmission through 1:Ö2

magnetics and onto the twisted-pair.

The transmit current is governed by the current through

the TXREF10 pin, which must be grounded through a

resistor as described in “External Components”.

RX10 Clock Recovery

The NWK933 employs a digital delay line controlled

by the 100MHz Synthesizer DLL to derive a sampling

clock from the incoming signal. The recovered clock

runs at twice the data rate (nominally 20MHz). When

a signal is received from the Signal Detect block, it is

used to strobe Link Pulses and Manchester encoded

serial data.

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