AX88780 datasheet(25/49 Pages) ASIX

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AX88780

4.20 RXBTHD0--RX buffer Threshold0 Register

Offset Address= FC58h

Default = 32’h0000_0300

Field

Name

Type

Default

Description

31:11

All 0’s

Reserved

10:0

RXLOWB

R/W

11’h300

RX Low-Bound Threshold for Pause Operation

This field defines the lower-bound threshold of RX buffer for pause

operation. If the flow control is enabled, MAC will refer this field for low

bound. The unit is a 16-byte. Diver can properly set this field for

performance issue. AX88780 is built 32KB buffer for rx operation, so the

combination of RXBTHD0 and RXBTHD1 will affect the performance of

receive.

4.21 RXBTHD1--RX Buffer Threshold1 Register

Offset Address= FC5Ch

Default = 32’h0000_0600

Field

Name

Type

Default

Description

31:11

All 0’s

Reserved

10:0

RXHIGHB

R/W

11’h600

RX Upper-Bound Threshold for Pause Operation

This field defines the upper-bound threshold of rx buffer for pause

operation. If the flow control is enabled, MAC will refer this field for

upper bound. The unit is a 16-byte. Diver can properly set this field for

performance issue.

4.22 RXFULTHD--RX Buffer Full Threshold Register

Offset Address= FC60h

Default = 32’h0000_0100

Field

Name

Type

Default

Description

31:11

All 0’s

Reserved

10:0

RXFULB

R/W

11’h100

RX Full Threshold

This field defines the least capacity of RX buffer. AX88780 will cause RX

full if it remains capacity under this value. The unit is 16-byte.

4.23 MISC—Misc. Control Register

Offset Address= FC68h

Default = 32’h0000_0003

Field

Name

Type

Default

Description

31:6

All 0’s

Reserved

WAKE_LNK

R/W

WAKE-UP by Link-Up Function

If this bit is enabled, MAC will drive wakeup pin whenever there is link-up

occurrence. The polarity of wakeup pin is according to bit0 of CMD

1= enable

0= disable

WAKE_MAG

R/W

WAKE-UP by Magic Packet

If this bit is enabled, MAC will drive wakeup pin whenever there is magic

packet detected by hardware. The polarity of wakeup pin is according to

bit0 of CMD register.

1= enable wake-up by magic packet

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