TNETX3150 datasheet(19/113 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

interface description

The TNETX3150/TNETX3150A functional interfaces are shown in Figure 1 and described in the following

paragraphs.

10-/100-/200-Mbit/s MAC interfaces (ports 00–14)

The 10-/100-/200-Mbit/s interface links the MAC interfaces to the FIFO and data-handling mechanisms of

TNETX3150/TNETX3150A.

The 10 Mbit/s ports (03–14) operate in serial mode only. When operating in 10-Mbit/s mode, the 10-/100-Mbit/s

interfaces (00–02) operate in either nibble or serial mode; when operating in 100-Mbit/s mode, the

10-/100-Mbit/s interfaces operate in nibble mode only. In 200-Mbit/s mode, port 00 operates in byte mode only.

data reception

Figure 2 shows a simplified 10-/100-Mbit/s receiver block diagram.

Buffer

CRC

Flag

Generator

RX Frame

Shifter

Buffer

RX FIFO

Link

Bit

Data Output

MUX

10-/100-

Mbit/s

Converter

Flags Output to FIFO

Rate

Select

Duplex

Nibble

to FIFO

Control

Signal

Control

10 Mbit/s

100 Mbit/s

MXXRXD

FIFO Control

and Statistics

Information

Figure 2. 10-/100-Mbit/s Receive Block Diagram

The data received from the external PHY forms 64-bit words. The data is synchronized to the internal clock of

TNETX3150/TNETX3150A. After deserialization, a flag byte is assigned to the data word, identifying attributes

for later data handling. The format of the flag-byte data is common for all ports. Once the 100-Mbit/s data has

been deserialized, it is handled the same as the 10-Mbit/s data.

giant (long) frames

The TNETX3150/TNETX3150A can handle frames up to 1536 bytes to support IEEE Std 802.10. All frames

longer than 1563 bytes are truncated by the TNETX3150/TNETX3150A. Frames greater than 1536 received

in cut-through mode are passed. Frames greater than 1536 received in store-and-forward mode are discarded

and not transmitted. The LONG option bit governs how the statics for long frames are recorded. The byte count

for long frames with good cyclic redundancy checks (CRCs) are recorded in the RX + TX-frames 1024–1518

statistic, (which effectively becomes RX + TX-frames 1024–1531 when LONG is set). Long frames received with

bad CRCs are recorded as jabbers.

short frames

All frames less than 64 bytes received into any port are filtered by the TNETX3150/TNETX3150A within the RX

FIFOs. They do not appear on the DRAM bus.

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