STE100P datasheet(9/31 Pages) STMICROELECTRONICS

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STE100P

PDEN

Power-down mode control.

1: Power-down mode is selected. Setting this bit puts the

STE100P into power-down mode. During the power-down

mode, TXP/TXN and all LED outputs are 3-stated, and the MII

interface is isolated.

0R/W

ISOEN

0 – Normal operation.

1 – Isolate PHY from MII.

Setting this control bit isolates the STE100P from the MII, with

the exception of the serial management inter-face. When this

bit is asserted, the STE100Pdoes not respond to TXD[3:0],

TX-EN, and TX-ER inputs, and it presents a high impedance

on its TX-CLK, RX-CLK, RX-DV, RX-ER, D[3:0], COL, and

CRS outputs.

0R/W

RSAN

Re-Start Auto-Negotiation process control.

1: Auto-Negotiation process will be re-started. This bit will be

cleared by STE100P itself after the Auto-negotiation restarted.

0R/W

DPSEL

Full/Half duplex mode select.

1: Full duplex mode is selected. This bit will be ignored if Auto-

Negotiation is enabled (bit 12 of PR0 = 1).

0: Half duplex mode is selected

0R/W

COLEN

Collision test control.

1: Collision test is enabled. 0: normal operation

This bit, when set, causes the COL signal to be asserted as a

result of the assertion of TX _EN. De-assertion of TX_EN will

cause the COL signal to be de-asserted.

0R/W

6~0

---

Reserved

R/W = Read/Write able. RO = Read Only.

PR1- XSR, XCVR Status Register. All the bits of this register are read only.

100BASE-T4 ability.

Always 0, since STE100P has no T4 ability.

0RO

TXFD

100Base-TX full duplex ability.

Always 1, since STE100P has the 100Base-TX full duplex

ability.

1RO

TXHD

100Base-TX half duplex ability.

Always 1, since STE100P has the 100Base-TX half duplex

ability.

1RO

10FD

10Base-T full duplex ability.

Always 1, since STE100P has 10Base-T full duplex ability.

1RO

10HD

10Base-T half duplex ability.

Always 1, since STE100P has 10Base-T half duplex ability.

1RO

10~7

---

Reserved

Table 5. Register Descriptions (continued)

Bit #

Name

Descriptions

Default Val

RW Type

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