TNETX3150 datasheet(25/113 Pages) TI1

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TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

uplink RX pretagging (continued)

M00RCLK

M00RXDVX

M00RXDV

Tag

DA, SA, Data, CRC

Pretag Nibble

Ethernet Frame

M00RXD7–M00RXD0

Figure 6. Data Format for Uplink RX Frames With Pretag

cascade connection

In uplink mode, the TNETX3150/TNETX3150A can route uplink frames by employing the EAM or internal

address registers. To allow this, the TAGOFF bit (bit 4 of RSIZE register 0x00C2) must be set. When set, the

TNETX3150/TNETX3150A does not require a post frame tag for frame-routing information. It routes the frame

according to the destination address. This permits the following:

D The TNETX3150/TNETX3150A can be cascaded with a second TNETX3150/TNETX3150A device to

permit larger port configurations to be supported with minimal additional hardware.

D The separate TNETX3150/TNETX3150A devices can use either single-address-per-port capability, or with

an external address-lookup device, provide network-address-support capability.

D Additional logic can be used in the interface to implement more sophisticated flow control on the uplink.

D Using EEPROM devices to provide initialization data, the devices can be used with or without a

management CPU, presenting a low-cost switching solution. A cascade connection is shown in Figure 7.

M00TCLK

M00TXER

M00RCLK

M00RXDVX

M00DUPLEX

M00TXD7–M00TXD0

M00TXEN

M00COL

M00CRS

M00RXD7–M00RXD0

M00RXDV

M00RXER

M00SPEED

M00PROTOCOL

M00LINK

M00UPLINK

M00RXER

M00RXDVX

M00RXDV

M00RXD7–M00RXD0

M00RCLK

M00CRS

M00COL

M00TXER

M00TXEN

M00TXD7–M00TXD0

M00TCLK

M00DUPLEX

M00SPEED

M00PROTOCOL

M00LINK

M00UPLINK

TNETX3150/

TNETX3150A

No.1

TNETX3150/

TNETX3150A

No.2

VCC(5V)

TXD(0)

Toggle

Flip-Flop

OSCIN (50 MHz)

Gnd

Figure 7. TNETX3150/TNETX3150A Cascade Connection

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