CP2201 datasheet(91/108 Pages) SILABS

91 / 108 page

CP2200/1

Rev. 1.0

Important Note: When using auto-negotiation, the auto-negotiation enable bit, AUTONEG (PHYCF.4), must

be set to “1” prior to

setting PHYEN, TXEN, and RXEN to 1. To restart auto-negotiation,

clear one of the three enable bits (PHYEN, TXEN, and RXEN) to “0” then set it back to “1”.

Bit 7:

PHYEN: Physical Layer Enable

0: The physical layer is placed in a low-power state with limited functionality.

1: The physical layer is placed in a normal power state and is fully functional.

Bit 6:

TXEN: Transmitter Enable

0: Physical Layer’s transmitter is placed in a low-power state. Packet transmission and Link Pulse

Generation Functions are disabled.

1. Physical layer’s transmitter is enabled.

Bit 5:

RXEN: Receiver Enable

0: Physical layer’s receiver is placed in a low-power state. Packet reception is disabled.

1: Physical layer’s receiver is enabled.

Bit 4:

DPLXMD: Full-duplex Mode Enable Bit

Note: This bit is read-only when Auto-Negotiation is enabled.

0: Half-duplex mode is selected.

1: Full-duplex mode is selected.

Bit 3:

LBMD: Loopback Mode Enable Bit

Note: Loopback mode is automatically disabled if a jabber condition is detected.

0: Loopback mode is disabled.

1: Loopback mode is enabled.

Bit 2:

LPRFAULT: Link Partner Remote Fault (Local Fault) Indicator

0: Normal operation.

1: The link partner has detected a link fault and has sent notification during auto-negotiation. This

condition can occur if the local transmitter is disabled and link pulses are no longer generated.

Bit 1:

POLREV: Polarity Reversed Indicator

0: Incorrect link polarity has not been detected.

1: Incorrect link polarity detected. Link polarity has been automatically reversed.

Bit 0:

LINKSTA: Link Status Indicator

0: Link is bad.

1: Link is good.

R/W

R/W or RO

R/W

Reset Value

PHYEN

TXEN

RXEN

DPLXMD

LBMD

LPRFAULT POLREV

LINKSTA 00000000

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Address:

0x78

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