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TNETX3270 数据表(PDF) 34 Page - Texas Instruments

部件名 TNETX3270
功能描述  ThunderSWITCHE 24/3 ETHERNETE SWITCH WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS
PDF  66 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TNETX3270 数据表(HTML) 34 Page - Texas Instruments

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TNETX3270
ThunderSWITCH
™ 24/3 ETHERNET™ SWITCH
WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS
SPWS043B – NOVEMBER 1997 – REVISED APRIL 1999
34
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
10-/100-Mbit/s MAC interfaces (ports 24–26)
Unlike the 10-Mbit/s ports, each 10-/100-Mbit/s port has a dedicated set of signals to interface to its PHY.
Table 12 shows how a TNETE2101 10-/100-Mbit/s PHY would be connected to one of the 10-/100-Mbit/s ports
of TNETX3270.
Table 12. 10-/100-Mbit/s Interface Connections
SWITCH
TERMINAL
TNETE2101
TERMINAL
MxxTCLK
←
MTCLK
MxxTXD3
→
MTXD3
MxxTXD2
→
MTXD2
MxxTXD1
→
MTXD1
MxxTXD0
→
MTXD0
MxxTXEN
→
MTXEN
MxxTXER
→
MTXER
MxxCOL
←
MCOL
MxxCRS
←
MCRS
MxxRCLK
←
MRCLK
MxxRXD3
←
MRXD3
MxxRXD2
←
MRXD2
MxxRXD1
←
MRXD1
MxxRXD0
←
MRXD0
MxxRXDV
←
MRXDV
MxxRXER
←
MRXER
MxxLINK
←
SLINK
MDCLK
→
MDCLK
MDIO
↔
MDIO
MRESET
→
MRST
Where xx = 24, 25, or 26, y = 0–3
Other differences from the 10-Mbit/s ports are noted in following paragraphs.
10-/100-Mbit/s port configuration
The 100-Mbit/s ports (24–26) can negotiate with the PHY (speed and duplex) at power-up via the EEPROM
contents using the MxxFORCE10 and MxxFORCEHD terminals, respectively.
Each of these terminals (per port):
D Has an integral 50-µA current-source pullup resistor. The system designer must decide if this is sufficient
to achieve a logic-1 level in a timely manner or if an external supplementary resistor is required.
D Has a strong open-drain pulldown transistor, which is enabled by setting to 1 the appropriate bit in the
Portxcontrol register.
D Is connected (via synchronization logic) to the appropriate bit in the Portxstatus register. These bits directly
control the configuration of the ports.



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