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LAN83C180 Datasheet(PDF) 10 Page - SMSC Corporation |
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LAN83C180 Datasheet(HTML) 10 Page - SMSC Corporation |
10 / 10 page Migrating from the LAN83C180 10/100 PHY to the LAN83C185 10/100 PHY SMSC AN 10.13 Page 10 Revision 1.2 (07-12-04) APPLICATION NOTE 7.1.3 RBIAS The LAN83C180 incorporates two (2) RBIAS resistors on signals TXREF100 and TXREF10 (Pins 33, 34). The LAN83C185 combines these onto one RBIAS signal - EXRES1 (Pin 59). The RBIAS resistor value for the LAN83C185 is 12.4K-Ohm. 7.1.4 Mode The Mode pins control the auto-negotiation, 10 and 100 Mbps data rates, and full-/half-duplex operation of the LAN83C185 PHY. The LAN83C180 utilizes two (2) pins - RPTR (Pin 21) and ANEN (Pin 22) which are analogous to the LAN83C185’s MODE pins (Pins 4, 5, and 6). Please refer to the LAN83C185 datasheet, “Mode Bus” paragraph, in the “Configuration Signals” section for proper Mode bus operation. 8 Application Specific Notes When designing the LAN83C185 with the SMSC LAN91C110 device, an extra single OR-GATE is required. The OR-GATE should be wired with CRS and RX_DV signals (from the LAN83C185) to the inputs of the OR-GATE. The output of the OR-GATE should be wired to the CRS100 pin of the LAN91C110. LAN91C110 LAN83C185 CRS RX_DV CRS100 9 Conclusion Following the guidelines in this application note will help to ensure a proper design-in when migrating from the LAN83C180 to the LAN83C185 Note that this application note serves only as a general set of guidelines that should be followed when using an SMSC LAN83C185 chip. Specific customer requirements may both create new guidelines, which must be followed, and/or force specific rules dictated here to be broken. |
Similar Part No. - LAN83C180 |
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Similar Description - LAN83C180 |
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