TNETX15AEPGE datasheet(21/79 Pages) TI1

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TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

serial interface I/O register, SIO at 0x0A (DIO)

BIT

NMRST

MCLK

MTXEN

MDATA

MDIOEN

ECLOK

ETXEN

EDATA

Initial values after reset

MDIO

EDIO

The SIO register contains the control bits for two serial interfaces to the TNETX15AE. Setting the outbound

signals changes the state of the external terminal. Sampling the inbound signals gives the state of the external

terminal. The MII to the PHY devices has a serial management portion. This interface can have multiple

masters, and allows for two-way data between master and slave. The interface to the EEPROM is simpler

because it is a dedicated path between one TNETX15AE and its EEPROM. Although it is also serial and two

way, there is only one master.

BIT

NAME

FUNCTION

NMRST

MII not reset. The state of MNRST directly controls the state of the MRESET line (MII reset)

– If NMRST is set to 0, the MRESET line is set to 0.

– If NMRST is set to 1, the MRESET line is set to 1.

This bit is not self-clearing and must be manually deasserted. It can be set low and then immediately set high. Since

every PHY attached to the MII may not have a reset terminal, it may be necessary to toggle NMRST and also individually

reset each PHY through MII commands. The default state of this bit is 0 (MII is in reset). The MDIOEN bit must be set

to drive MRESET.

MCLK

MII SIO clock. MCLK controls the state of the MDCLK terminal. The MDIOEN bit must be set to drive MDCLK.

– When MCLK is set to 1, MDCLK is set to 1.

– When MCLK is set to 0, MDCLK is set to 0.

MTXEN

MII SIO transmit enable. MTXEN is used with the MDATA bit to read/write information from/to the MDIO terminal. The

MDIOEN bit must be set to drive MDIO.

– When MTXEN is set to 1, the MDIO terminal is driven with the value in the MDATA bit.

– When MTXEN is set to 0, MDATA is loaded with the value in the MDIO terminal.

MDATA

MII SIO data. MDATA is used with MTXEN to read/write information from/to the MDIO terminal.

– When MTXEN is set to 1, MDIO is driven with the value in this bit.

– When MTXEN is set to 0, this bit is loaded with the value on MDIO.

The MDIOEN bit must be set to drive MDIO. The default value of this bit is the value driven on the MDIO terminal.

MDIOEN

MII SIO data terminal enable. MDIOEN enables the high-Z control of the MDIO, MDCLK, and MRESET terminals.

– Setting MDIOEN to 1 enables MII outputs.

– Setting MDIOEN to 0 places MII outputs in a high-Z state.

The default state of this bit is 0 (MII disabled)

ECLOK

EEPROM SIO clock. ECLOK controls the state of the ECLK terminal.

– When ECLOK is set to 1, ECLK is set to 1.

– When ECLOK is set to 0, ECLK is set to 0.

ETXEN

EEPROM SIO transmit enable. ETXEN controls the direction of the EDIO terminal.

– When ETXEN is set to 1, EDIO is driven with the value in the EDATA bit.

– When ETXEN is set to 0, EDATA is loaded with the value on the EDIO terminal.

EDATA

EEPROM SIO data. EDATA is used to read or write the state of the EDIO terminal.

– When EXTEN is set to 1, EDIO is driven with the value in this bit.

– When EXTEN is set to 0, EDATA is loaded with the value on EDIO.

The default value of this bit is the value driven on the EDIO terminal.

TNETX15AEPGE Datasheet(PDF) 21 Page - Texas Instruments

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