DM9302 datasheet(22/64 Pages) DAVICOM

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DM9302

10/100Mbps Ethernet Fiber/Twisted Pair Media Converter with Local bus

Preliminary datasheet

DM9302-15-DS-P01

July 30, 2009

6.24 TX/RX Memory Size Control Register (3FH)

Bit

Name

Default

Description

7:6

Reserved

PS0,RO

Reserved

5:0

TX_SIZE

P20h,RW

TX Block Size in 2-Port Mode

This value defines the transmit block size in 256-byte unit.

TX memory size = TX_SIZE * 256 bytes

And then

RX memory size = 16KB – (TX_SIZE + 1)*256-Byte

Note: The value of TX_SIZE should be between 14H and 30H

6.25 Switch Control Register (52H)

Bit

Name

Default

Description

MEM_BIST

PH0,RO

Address Memory Test BIST Status

0: OK

1: Fail

RST_SW

P0,RW

Reset Switch Core and auto clear after 10us

RST_ANLG

P0,RW

Reset Analog PHY Core and auto clear after 10us

4:3

SNF_PORT

PE00,RW

Sniffer Port Number

Define the port number to act as the sniffer port

CRC_DIS

PE0,RW

CRC Checking Disable

When set, the received CRC error packet also accepts to receive memory.

1:0

AGE

PE0,RW

Aging

00: no aging

01: 64 ± 32 sec

10: 128 ± 64 sec

11: 256 ±128 sec

6.26 VLAN Control Register (53H)

Bit

Name

Default

Description

TOS6

PE0,RW

Full ToS Using Enable

1: check most significant 6-bit of TOS

0: check most significant 3-bit only of TOS

RESERVED

0,RO

Reserved

UNICAST

PE0,RW

Unicast packet can across VLAN boundary

VIDFF

PE0,RW

Replace VIDFF

If the received packet is a tagged VLAN with VID equal to “FFF”, its VLAN field is

replaced with VLAN tag defined in Reg. 6EH and 6FH.

VID1

PE0,RW

Replace VID01

If the received packet is a tagged VLAN with VID equal to “001”, its VLAN field is

replaced with VLAN tag defined in Reg. 6EH and 6FH.

VID0

PE0,RW

Replace VID0

If the received packet is a tagged VLAN with VID equal to “000”, its VLAN field is

replaced with VLAN tag defined in Reg. 6EH and 6FH.

PRI

PE0,RW

Replace priority field in the tag with value define in Reg 6FH bit 7~5.

VLAN

PE0,RW

VLAN mode enable

1: 802.1Q base VLAN mode enable

0: port-base VLAN only

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