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TNETX3150GGP 数据表(PDF) 36 Page - Texas Instruments |
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TNETX3150GGP 数据表(HTML) 36 Page - Texas Instruments |
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36 / 113 page  TNETX3150/TNETX3150A ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997 36 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 DRAM and EAM interfaces (continued) Table 6. EAM Port Codes TNETX3150/TNETX3150A EAM15 EAM14 EAM05 EAM04 EAM03 EAM00 PORT MODE SELECT EAM14–EAM05 EAM04 EAM03–EAM00 Port 00 (uplink) 1 xxxxxxxxxx 0 0000 Port 01 (10/100 Mbit/s) 1 xxxxxxxxxx 0 0001 Port 02 (10/100 Mbit/s) 1 xxxxxxxxxx 0 0010 Port 03 (10 Mbit/s) 1 xxxxxxxxxx 0 0011 Port 04 (10 Mbit/s) 1 xxxxxxxxxx 0 0100 Port 05 (10 Mbit/s) 1 xxxxxxxxxx 0 0101 Port 06 (10 Mbit/s) 1 xxxxxxxxxx 0 0110 Port 07 (10 Mbit/s) 1 xxxxxxxxxx 0 0111 Port 08 (10 Mbit/s) 1 xxxxxxxxxx 0 1000 Port 09 (10 Mbit/s) 1 xxxxxxxxxx 0 1001 Port 10 (10 Mbit/s) 1 xxxxxxxxxx 0 1010 Port 11 (10 Mbit/s) 1 xxxxxxxxxx 0 1011 Port 12 (10 Mbit/s) 1 xxxxxxxxxx 0 1100 Port 13 (10 Mbit/s) 1 xxxxxxxxxx 0 1101 Port 14 (10 Mbit/s) 1 xxxxxxxxxx 0 1110 Broadcast channel 1 xxxxxxxxxx 0 1111 No operation (discard) 1 xxxxxxxxxx 1 xxxx Frame discard 0 0000000000 0 0000 Bit-map mode 0 EAM14–EAM0 equals port destination bit map VLAN support For the single-address-per-port mode, TNETX3150/TNETX3150A provides a VLAN register per port. Each register contains a bit map to indicate the VLAN group for the port. All broadcast/multicast traffic received on that port is sent only to the ports that are a part of the same VLAN. The EAM14–EAM00 inputs, when EAM15 (mode select) is low, provide a mechanism for the EAM interface to specify which destination port or group of destination ports must be used to transmit the frame. Each signal represents one destination port. Asserting just one signal sends the frame to one destination port and asserting more than one signal allows the same frame to be transmitted to multiple ports. This allows the EAM interface to limit the broadcast/multicast traffic within the VLAN. This mode of operation employs the IOB mechanism to append the frames onto the transmit queues of the ports used for frame transmission. The IOB mechanism is an inefficient way to send frames to single ports when individual port codes can be used. |
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