ICS1892 datasheet(64/148 Pages) ICST

64 / 148 page

ICS1892, Rev. D, 2/26/01

February 26, 2001

Chapter 8

Management Register Set

ICS1892 Data Sheet

8.2.5

Low Power Mode (bit 0.11)

This bit provides one way to control the ICS1892 low-power mode function. When bit 0.11 is logic:

• Zero, there is no impact to ICS1892 operations.

• One, the ICS1892 enters the low-power mode. In this case, the ICS1892 disables all internal functions

and drives all MAC/repeater output pins low except for those that support the MII Serial Management

Port.

Note:

There are two ways the ICS1892 can enter low-power mode. When entering low-power mode:

• By setting bit 0.11 to logic one, the ICS1892 maintains the value of all management register bits

except the latching high (LH) and latching low (LL) status bits, which are re-initialized to their

default values instead. (For more information on latching high and latching low bits, see Section

8.1.4.1, “Latching High Bits” and Section 8.1.4.2, “Latching Low Bits”.)

• During a reset, the ICS1892 sets all management register bits to their default values.

8.2.6

Isolate (bit 0.10)

This bit controls the ICS1892 Isolate function. When bit 0.10 is logic:

• Zero, there is no impact to ICS1892 operations.

• One, the ICS1892 electrically isolates its data paths from the MAC/Repeater Interface. The ICS1892

places all MAC/repeater output signals, (TXCLK, RXCLK, RXDV, RXER, RXD[3:0], COL, and CRS), in a

high-impedance state and it isolates all MAC/repeater input signals, (TXD[3:0], TXEN, and TXER). In

this mode, the Management Interface continues to operate normally (that is, bit 0.10 does not affect the

Management Interface).

The default value for bit 0.10 depends upon the PHY address of Table 8-16. If the PHY address:

• Is equal to 00000b, then the default value of bit 0.10 is logic one, and the ICS1892 isolates itself from the

MAC/Repeater Interface.

• Is not equal to 00000b, then the default value of bit 0.10 is logic zero, and the ICS1892 does not isolate

its MAC/Repeater Interface.

8.2.7

Restart Auto-Negotiation (bit 0.9)

This bit allows an STA to restart the auto-negotiation process in Software mode (that is, the HW/SW pin is

logic one). When bit 0.12 is logic:

• Zero, the Auto-Negotiation sublayer is disabled, and the ICS1892 isolates any attempt by the STA to set

bit 0.9 to logic one.

• One (as set by an STA), the ICS1892 restarts the auto-negotiation process. Once the auto-negotiation

process begins, the ICS1892 automatically sets this bit to logic zero, thereby providing the self-clearing

feature.

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