AM79C901A datasheet(64/90 Pages) AMD

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Am79C901A

PR ELI M IN AR Y

TBR17: 10BASE-T PHY Control/Status Register (Register 17)

This register is used to control the configuration of the 10

Mbps PHY of the Am79C901A home networking device.

See Table 1.

Table 1.

TBR17: 10BASE-T PHY Control/Status Register (Register 17)

Note: For these loopback paths, the data is also transmitted out of the MDI pins (TX±).

Bits

Name

Description

Read/Write

Default

Value

(hex)

15:14

Reserved

R00

Force Link Good Enable

1 = Link status forced to link up state

0 = Link status is determined by the device

R/W

Disable Link Pulse

1 = Link pulses sent from the 10BASE-T transmitter

are suppressed

0 = Link pulse enabled (normal operation)

R/W

SQE_TEST Disable

1 = Disables the SQE heartbeat which occurs after

each 10BASE-T transmission

0 = The heartbeat assertion occurs on the COL pin

approximately 1 µs after transmission and for a

duration of 1 µs

R/W

Reserved

Jabber Detect Disable

1 = Disable jabber detect

0 = Enable jabber detect

R/W

8:7

Reserved

R00

Receive Polarity

Reversed

1 = Receive polarity of the 10BASE-T receiver is

reversed

0 = Receive polarity is correct

Auto Receive Polarity

Correction Disable

1 = Polarity correction circuit is disabled for

10BASE-T

0 = Self correcting polarity circuit is enabled

R/W

Extended Distance

Enable

1 = 10BASE-T receive squelch thresholds are

reduced to allow reception of frames which are

greater than 100 meters

0 = Squelch thresholds are set for standard distance

of 100 meters

R/W

TX_DISABLE

1 = TX± outputs not active

0 = Transmit valid data

R/W

TX_CRS_EN

1 = CRS is asserted when transmit or receive

medium is active

0 = CRS is asserted when receive medium is active

R/W

Reserved

PHY Isolated

1 = 10BASE-T PHY is isolated

0 = 10BASE-T PHY is enabled

AM79C901A Datasheet(PDF) 64 Page - Advanced Micro Devices

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