DP83256 datasheet(43/144 Pages) NSC

43 / 144 page

50 Registers (Continued)

51 MODE REGISTER (MR)

The Mode Register is used to initialize and configure the PLAYERa device

ACCESS RULES

ADDRESS

READ

WRITE

00h

Always

RNRZ

TNRZ

TQL

LILB

SILB

RUN

Bit

Symbol

Description

RUN

RUN ESTOP

0 Enables the STOP mode Refer to section 42 STOP MODE for more information

1 Normal operation (ie RUN mode)

Note

The RUN bit is automatically set to 0 when the ERST pin is asserted (ie set to ground)

SILB

SHORT INTERNAL LOOPBACK

0 Disables Internal Loopback mode (ie normal operation)

1 Enables Internal Loopback mode

Refer to section 43 LOOPBACK MODE for more information

LILB

LONG INTERNAL LOOPBACK

0 Disables Long Internal Loopback mode (ie normal operation)

1 Enables Long Internal Loopback mode

Note

Long Internal Loopback should not be used when the Alternate PMD Interface is enabled

Refer to section 43 LOOPBACK MODE for more information

CASCADE MODE

0 Disables synchronization of cascaded PLAYERa devices

1 Enables the synchronization of cascaded PLAYERa devices

Refer to section 44 CASCADE MODE for more information

Note

Cascade Mode is only available on the DP83257 device The other devices do not have the required CS and CR pins Do not set this bit for

any device but the DP83257

TQL

TRANSMIT QUIET LEVEL

This bit is used to program the transmission level of the Quiet symbols during Off

Transmit mode (OTM) only

0 Low (PMD OFF) level Quiet symbols are transmitted through the PMD Data Request pins (ie PMRD ae low

PMRD be high)

1 High (PMD ON) level Quiet symbols are transmitted through the PMD Data Request pins (ie PMRD ae high

PMRD be low)

TRANSMIT ENABLE

The TE bit controls the action of the PMD transmitter Enable (TXE) pin When TE is 0 the

TXE output disables the PMD transmitter when TE is 1 the PMD transmitter is disabled during the Off Transmit

Mode (OTM) and enabled otherwise The On and Off level of the TXE is depended on the PMD transmitter Enable

Level (TEL) pin to the PLAYERa device The following rules summaries the output of TXE

1 If TEe0 then TXEeOff

2 If TEe1 and OTM then TXEeOff

3 If TEe1 and not OTM then TXEeOn

TNRZ

TRANSMIT NRZ DATA

0 Transmits data in Non-Return-To-Zero-Invert-On-Ones (NRZI) format (normal format)

1 Transmits data in Non-Return-To-Zero format (NRZ)

RNRZ

RECEIVE NRZ DATA

0 Receives data in Non-Return-To-Zero-Invert-On-Ones format (NRZI) (normal format)

1 Receives data in Non-Return-To-Zero format (NRZ)

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