DP83256 datasheet(48/144 Pages) NSC

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50 Registers (Continued)

55 CURRENT TRANSMIT STATE REGISTER (CTSR)

The Current Transmit State Register can program the Transmitter Block to internally generate and transmit Idle Master Halt

Quiet or user programmable symbol pairs in addition to the normal transmission of incoming PHY Request data The Smoother

and PHY Request Data Parity are also enabled and disabled through this register

When the Trigger Definition register (TDR) is used the CTSR can automatically be set to a preprogrammed line state when a

trigger condition occurs This capability can be used to implement both PC

React and CF

React

The Transmit Modes have priority over the Repeat Filter and Smoother outputs The Injection Symbols have priority over the

Transmit Modes

During the reset process (ie ERSTeGND) the Transmit Mode is set to Off (TMk20le010) the Smoother is enabled (ie SE

is set to 1) and the Reserved bit (b7) is set to 1 All other bits of this register are cleared (ie set to 0) during the reset process

When the TDR register is used to respond to trigger conditions the CTSR will be blocked when the TDR register transmit mode

is copied into the CTSR The Write Reject bit of the ICR will be set if any writes are attempted at this time

Note

This register has no effect while the device is in Stop Mode

ACCESS RULES

ADDRESS

READ

WRITE

04h

Always

Conditional

RES

PRDPE

IC1

IC0

TM2

TM1

TM0

Bit

Symbol

Description

D0 D1

TM0 TM1

Transmit Mode k0 1 2l

These bits select one of the 6 transmission modes for the PMD Request Data

output port (TXDg)

TM2

TM1

TM0

000

Active Transmit Mode (ATM)

Normal transmission of incoming PHY Request data

001

Idle Transmit Mode (ITM)

Transmission of Idle symbol pairs (11111 11111)

010

Off Transmit Mode (OTM)

Transmission of Quiet symbol pairs (00000 00000) and

deassertion of the PMD transmitter Enable pin (TXE)

Note

This is the default transmit mode after reset

011

Reserved

Reserved for future use Users are discouraged from using this transmit

mode If selected however the transmitter will generate Quiet symbol pairs (00000

00000)

100

Master Transmit Mode (MTM)

Transmission of Halt and Quiet symbol pairs (00100

00000)

101

Halt Transmit Mode (HTM)

Transmission of Halt symbol pairs (00100 00100)

110

Quiet Transmit Mode (QTM)

Transmission of Quiet symbol pairs (00000 00000)

111

Reserved

Reserved for future use Users are discouraged from using this transmit

mode If selected however the transmitter will generate Quiet symbol pairs

(00000 00000)

DP83256 数据表(PDF) 48 Page - National Semiconductor (TI)

DP83256 数据表(HTML) 48 Page - National Semiconductor (TI)

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