DM9801A datasheet(39/60 Pages) DAVICOM

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DM9801A

1M Home Phoneline Network Physical Layer Single Chip Transceiver

Final

Version: DM9801A-DS-F01

May 30, 2001

RX_PCOM Low A Register - Register 13 (INTFSEL = 1, GPSI Mode)

Bit

Bit Name

Default

Description

13.7 –

13.0

RX_PCOM_LOA

0, RW

RX_PCOM_LOA:

The 15

th through the 8th bits of the 32-bit receive data field to be used

for out-of-band communications between PHY management entities.

A non-null receive PCOM will set the RX_PCOM_VAL bit in the ISTAT

An access of the high byte of the RX_PCOM_HI register will clear the

RX_PCOM_VAL bit in the ISTAT register.

RX_PCOM High B Register - Register 14 (INTFSEL = 1, GPSI Mode)

Bit

Bit Name

Default

Description

14.7 –

14.0

RX_PCOM_HIB

0, RW

RX_PCOM_HIB:

The 23

rd through the 16th bits of the 32-bit receive data field to be used

for out-of-band communications between PHY management entities.

A non-null receive PCOM will set the RX_PCOM_VAL bit in the ISTAT

An access of the high byte of this register will clear the

RX_PCOM_VAL bit in the ISTAT register.

RX_PCOM High A Register - Register 15 (INTFSEL = 1, GPSI Mode)

Bit

Bit Name

Default

Description

15.7 -

15.0

RX_PCOM_HIA

0, RW

RX_PCOM_HIA:

The MSB of the 32-bit receive data field to be used for out-of-band

communications between PHY management entities.

A non-null receive PCOM will set the RX_PCOM_VAL bit in the ISTAT

An access of the high byte of this register will clear the

RX_PCOM_VAL bit in the ISTAT register.

Noise Level Register - Register 16 (INTFSEL = 1, GPSI Mode)

Bit

Bit Name

Default

Description

16.7 -

16.0

NOISE_LEVEL

0x07, RW

NOISE LEVEL:

This is the digital value of the SLICE_LVL_NOISE output. It is

effectively a measure of the noise level on the wire. When auto-

adaptation is enabled (bit 5 of the Control register is false) this register

is updated with the current noise count every 50n Secs. When

adaptation is disabled, this register can be written and is used to

generate both the SLICE_LVL_NOISE and the SLICE_LVL_DATA

signals.

Peak Level Register - Register 17 (INTFSEL = 1, GPSI Mode)

Bit

Bit Name

Default

Description

17.7 -

17.0

PEAK_LEVEL

0xFF, RW

Peak Level:

This is a measurement of the peak level of the last valid (non-collision)

AID received also, the maximum allowable value of the noise

measurement. If NOISE_LEVEL exceeds PEAK_LEVEL,

NOISE_LEVEL is reset to NOISE_FLOOR.

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