Intel® 21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller
4.021143 Requirements
This section provides information about the external component connections for the 21143, and describes the following requirements:
•Unused JTAG port requirements
•Current reference and capacitor input
•Crystal connection or crystal oscillator connection for the serial clock connection
4.1Unused JTAG Port Requirements
Table 10 describes the 21143 signal pin requirements if you are not using the JTAG port.
Table 10. Pin Requirements When Not Using the JTAG Port
Leave the Following JTAG Pins Open | Pull the Following JTAG Pin Up or Down |
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tms (pin 1) | tck (pin 120) |
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tdi (pin 2) |
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tdo (pin 4) |
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4.2Current Reference and Capacitor Input Requirements
Table 11 describes the current reference and capacitor input requirements for the 21143, and Figure 10 shows the external component connections.
Table 11. Current Reference and Capacitor Inputs
Pin Name | Pin Number | Function |
| Connect This Pin... | |
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iref | 108 | Current reference input | for the analog | Through a 2.4 kΩ resistor to ground | |
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vcap_h | 110 | Capacitor input |
| Through a 0.022 ∝ F capacitor to ground | |
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Design Guide | 19 |
