DP83251 datasheet(28/96 Pages) NSC

28 / 96 page

50 Registers (Continued)

CURRENT TRANSMIT STATE REGISTER (CTSR)

(Continued)

Bit

Symbol

Description

D3 D4

IC0 IC1

Injection Control k0 1l

These bits select one of the 4 injection modes The injection modes

overwrite data from the Smoother Repeat Filter Encoder and Transmit Modes

IC0 is the only bit of the register that is automatically cleared by the PLAYER device after the One Shot

Injection is executed The automatic clear of IC0 during the One Shot mode can be interpreted as an

acknowledgment that the One Shot has been completed

IC1

IC0

No Injection

The normal transmission of

incoming PHY Request data (ie symbols are

not injected)

One Shot

In one shot mode Injection

Symbol Register A (ISRA) and Injection

Symbol Register B (ISRB) are injected n

symbol pairs after a JK where n is the

programmed value of the Injection Count

symbol pair is replaced by ISRA and ISRB

Once the One Shot is executed the PLAYER

device automatically sets IC0 to 0 thereby

returning to normal transmission of data

Periodic

In Periodic mode Injection Symbol

symbol pair where n is the programmed

value of the Injection Count Register (IJCR)

If IJCR is set to 0 all data symbols are

replaced with ISRA and ISRB

Continuous

In Continuous mode all data

symbols are replaced with Injection Symbol

SMOOTHER ENABLE

0 Disables the Smoother

1 Enables the Smoother

When enabled the Smoother can redistribute Idle symbol pairs which were added or deleted by

the local or upstream receivers

Note

Once the counter has started it will continue to count irrespective of the incoming symbols with the exception of a

JK symbol pair This bit should be enabled for interoperable operation

PRDPE

PHY

REQUEST DATA PARITY ENABLE

0 Disables PHY

Request Data parity

1 Enables PHY

Request Data parity

RES

RESERVED

Reserved for future use

Note

Users are discouraged from using this bit The reserved bit is set to 1 during the reset process It may be set or

cleared without any effects to the functionality of the PLAYER device

DP83251 Datasheet(PDF) 28 Page - National Semiconductor (TI)

DP83251 Datasheet(HTML) 28 Page - National Semiconductor (TI)

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