DP83256 datasheet(32/146 Pages) TI1

32 / 146 page

40 Modes of Operation

The PLAYERa device can operate in 4 basic modes RUN

STOP LOOPBACK and CASCADE

41 RUN MODE

RUN is the normal mode of operation

In this mode the PLAYERa device is configured to be con-

nected to the media via the PMD transmitter and PMD re-

ceiver at the PMD Interface It is also connected to any

other PLAYERa device(s) andor MACSI device(s) via the

Port A and Port B Interfaces

While operating in the RUN mode the PLAYERa device

receives and transmits Line States (Quiet Halt Master Idle)

and frames (Active LIne State)

42 STOP MODE

The PLAYERa device operates in the STOP mode while it

is being initialized or configured

The PLAYERa device is also reset to the STOP mode au-

tomatically when the ERST pin is set to ground

When in STOP mode the PLAYERa device performs the

following functions

Resets the Repeat Filter

Resets the Smoother

Resets the Receiver Block Line State Counters

Resets the Clock Recovery Module

Flushes the Elasticity Buffer

Forces Line State Unknown in the Receiver Block

Outputs PHY Invalid condition symbol pairs through the

PHY Data Indicate pins (AIP AIC AIDk70l BIP BIC

BIDk70l) when port is enabled

Outputs Quiet symbol pairs through the PMD Data Re-

quest pins (PMRDg)

43 LOOPBACK MODE

The PLAYERa device provides 3 types of loopback tests

Configuration Switch Loopback Short Internal Loopback

and Long Internal Loopback These Loopback modes can

be used to test different portions of the device

Configuration Switch Loopback

The Configuration Switch Loopback can be used to test the

data paths of the MACSI device(s) that are connected to the

PLAYERa device before transmitting and receiving data

through the network

In the Configuration Switch Loopback mode the PLAYERa

device Configuration Register (CR) can be programmed to

perform the following functions

Select Port A PHY Request Data Port B PHY Request

Data or PHY Invalid to connect to Port A PHY Indicate

Data via the A

IND Mux

Select Port A PHY Request Data Port B PHY Request

Data or PHY Invalid to connect to Port B PHY Indicate

Data via the B

IND Mux

Connect data from the Receiver Block to the Transmitter

Block via the Transmitter

Mux (The PLAYERa device

is repeating incoming data from the media in the Configu-

ration Switch Loopback mode)

See

Figure 4-1 and Figure 4-2

TLF11708 – 23

FIGURE 4-1 Configuration Switch Loopback

for DP83257

TLF11708 – 24

FIGURE 4-2 Configuration Switch Loopback

for DP83256 and DP 83256-AP

DP83256 Datasheet(PDF) 32 Page - Texas Instruments

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