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TNETX3150 データシート(PDF) 46 Page - Texas Instruments |
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TNETX3150 データシート(HTML) 46 Page - Texas Instruments |
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46 / 113 page  TNETX3150/TNETX3150A ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997 46 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 revision register at 0x00A0† BIT 7 6 5 4 3 2 1 0 Revision BIT NAME FUNCTION 7–4 Revision Major hardware revision code for this device. This field is read only. Initial samples have a revision code of 0x00. 3–0 Revision Minor hardware revision code for this device. This field is read only. Initial samples have a revision code of 0x00. † The TNETX3150 has a revision register of 0x01xx. The TNETX3150A has a revision register of 0x02xx. SIO/XCTRL register at 0x00A1 XCTRL REGISTER SIO REGISTER BIT BIT 7 6 5 4 3 2 1 0 WUPLINK CUT100 RXARB BRUN Reserved ECLOK ETXEN EDATA Initial Values After Reset – 0 0 0 0 0 0 0 BIT NAME FUNCTION 7 WUPLINK Wide uplink mode. WUPLINK reflects the status of the M00UPLINK strapping terminal (note that M00UPLINK is active low). Logic 1 = wide uplink mode (this bit is read only) 6 CUT100 Single-buffer cut-through operation on 100-Mbit/s ports only. CUT100 disables single-buffer cut-through operation for frames received on 10-Mbit/s source ports. A frame is transmitted only when two buffers have been transferred to the transmit FIFO or an end of frame (before two buffers) has been received. Although it increases latency, enabling CUT100 reduces the probability of dropping frames due to FIFO underrun in heavy bursty traffic. 5 RXARB Receive arbitration mode. RXARB = 1 ensures that no frames are dropped during bursty conditions. When RXARB = 0, errored frames can be transmitted. 4 BRUN Broadcast to unassigned ports. If no port address is matched, BRUN = 1 forces the TNETX3150/TNETX3150A to broadcast a unicast frame to all unassigned ports (ports that are enabled but do not have a port address). When BRUN = 0, all unmatched unicast frames are sent to the uplink port. BRUN = 0 if an external address-lookup device is used. The external address-lookup device should provide the function. 3 Reserved Reserved. 2 ECLOK EEPROM SIO clock. ECLOK controls the state of the ECLK terminal. When ECLOK = 1, ECLK is asserted. When ECLOK = 0, ECLK is deasserted. ECLOK also is used to determine the state of the EEPROM interface. If the EEPROM port is disabled, then ECLOK is always read as a 0, even if a value of 1 is written to the bit. the TNETX3150/TNETX3150A detects that the EEPROM port is disabled by sensing the state of the EDIO terminal during reset. If EDIO is read as a 0 during reset (due to an external pulldown resistor), then the EEPROM interface is disabled and no attempt is made to read configuration information. 1 ETXEN EEPROM SIO transmit enable. ETXEN controls the direction of the EDIO terminal. When ETXEN = 1, EDIO is driven with the value in the EDATA bit. When ETXEN = 0, EDATA is loaded with the value on the EDIO terminal. 0 EDATA EEPROM SIO data. EDATA is used to read or write the state of the EDIO terminal. When ETXEN = 1, EDIO is driven with the value in EDATA. When ETXEN = 0, EDATA is loaded with the value on the EDIO terminal. |
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