AM79C930VCW datasheet(117/161 Pages) AMD

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P R E L I M I N A R Y

AMD

117

Am79C930

CONFIGURATION REGISTER INDEX:

15h

Bit

Name

Reset Value

Description

3–0

BDRN[3:0]

Baud Detect Ratio. These bits are used to set the ratio of good to

bad baud detections which will be used as the minimum ratio to de-

termine that a valid signal is present on the medium. The value in

this register is treated as a radix 2 positive real number with two

decimal places. The lowest practical value possible is 0.25 (=00.01)

and the highest practical value is 3.75 (=11.11).

TCR22: Baud Detect Accept Count

This register is the Baud Detect Accept Count register. A

read-only register that indicates the current number of

good transitions detected by the baud detector.

CONFIGURATION REGISTER INDEX:

16h

Bit

Name

Reset Value

Description

7–6

Reserved

–

Reserved. Must be written as a 0. Reads of this bit produce

undefined data.

5–0

ACPT[5:0]

00h

Accept[5:0] The value of these bits indicates the current number

of good transitions detected by the baud detector. This is a

read-only register.

TCR23: Baud Detect Fail Count

This register is the Baud Detect Fail Count register. A

read-only register that indicates the current number of

bad transitions detected by the baud detector.

CONFIGURATION REGISTER INDEX:

17h

Bit

Name

Reset Value

Description

7–6

Reserved

–

Reserved. Must be written as a 0. Reads of this bit produce

undefined data.

5–0

FAIL[5:0]

00h

Fail[5:0] The value of these bits indicates the current number of

bad transitions detected by the baud detector. This is a

read-only register.

TCR24: RSSI Sample Start

This register is the RSSI Sample Start register. The

value in this register is used to determine when to cap-

ture a sample of the RSSI input for A/D conversion dur-

ing antenna diversity operation. The register value is a

measure of the time of RSSI sample relative to the an-

tenna switching event. A register value of 0 means that

no RSSI samples will be taken.

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