ICS1893 datasheet(68/153 Pages) RENESAS

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ICS1893 Rev C 6/6/00

June, 2000

Chapter 8

Management Register Set

ICS1893 Data Sheet - Release

8.3.2

100Base-TX Full Duplex (bit 1.14)

The STA reads this bit to learn if the ICS1893 can support 100Base-TX, full-duplex operations. The

ISO/IEC specification requires that the ICS1893 must set bit 1.14 to logic:

• Zero if it cannot support 100Base-TX, full-duplex operations.

• One if it can support 100Base-TX, full-duplex operations. (For the ICS1893, the default value of bit 1.14

is logic one, in that the ICS1893 supports 100Base-TX, full-duplex operations.)

Bit 1.14 is a Command Override Write bit, which allows an STA to alter the default value of this bit. [See the

description of bit 16.15, the Command Override Write Enable bit, in Section 8.11, “Register 16: Extended

Control Register”.]

8.3.3

100Base-TX Half Duplex (bit 1.13)

The STA reads this bit to learn if the ICS1893 can support 100Base-TX, half-duplex operations. The

ISO/IEC specification requires that the ICS1893 must set bit 1.13 to logic:

• Zero if it cannot support 100Base-TX, half-duplex operations.

• One if it can support 100Base-TX, half-duplex operations. (For the ICS1893, the default value of bit 1.13

is logic one. Therefore, when an STA reads the Status Register, the STA is informed that the ICS1893

supports 100Base-TX, half-duplex operations.)

This bit 1.13 is a Command Override Write bit, which allows an STA to alter the default value of this bit.

[See the description of bit 16.15, the Command Override Write Enable bit, in Section 8.11, “Register 16:

Extended Control Register”.]

8.3.4

10Base-T Full Duplex (bit 1.12)

The STA reads this bit to learn if the ICS1893 can support 10Base-T, full-duplex operations. The ISO/IEC

specification requires that the ICS1893 must set bit 1.12 to logic:

• Zero if it cannot support 10Base-T, full-duplex operations.

• One if it can support 10Base-T, full-duplex operations. (For the ICS1893, the default value of bit 1.12 is

logic one. Therefore, when an STA reads the Status Register, the STA is informed that the ICS1893

supports 10Base-T, full-duplex operations.)

This bit 1.12 is a Command Override Write bit, which allows an STA to alter the default value of this bit.

[See the description of bit 16.15, the Command Override Write Enable bit, in Section 8.11, “Register 16:

Extended Control Register”.]

8.3.5

10Base-T Half Duplex (bit 1.11)

The STA reads this bit to learn if the ICS1893 can support 10Base-T, half-duplex operations. The ISO/IEC

specification requires that the ICS1893 must set bit 1.11 to logic:

• Zero if it cannot support 10Base-T, half-duplex operations.

• One if it can support 10Base-T, half-duplex operations. (For the ICS1893, the default value of bit 1.11 is

logic one. Therefore, when an STA reads the Status Register, the STA is informed that the ICS1893

supports 10Base-T, half-duplex operations.)

Bit 1.11 of the ICS1893 Status Register is a Command Override Write bit., which allows an STA to alter the

default value of this bit. [See the description of bit 16.15, the Command Override Write Enable bit, in

Section 8.11, “Register 16: Extended Control Register”.]

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