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LAN91C100-FD Datasheet(PDF) 8 Page - SMSC Corporation |
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LAN91C100-FD Datasheet(HTML) 8 Page - SMSC Corporation |
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8 / 78 page  FEAST Fast Ethernet Controller with Full Duplex Capability Rev. 01-20-06 Page 8 SMSC DS – LAN91C100FD Rev. D DATASHEET PQFP/TQFP PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 175 Asynchron- ous Ready ARDY OD16 Open drain output. ARDY may be used when interfacing asynchronous buses to extend accesses. Its rising (access completion) edge is controlled by the XTAL1 clock and, therefore, asynchronous to the host CPU or bus clock. 106 nSynchron - ous Ready nSRDY O16 Output. This output is used when interfacing synchronous buses and nVLBUS=0 to extend accesses. This signal remains normally inactive, and its falling edge indicates completion. This signal is synchronous to the bus clock LCLK. 109 nReady Return nRDYRTN I Input. This input is used to complete synchronous read cycles. In EISA burst mode it is sampled on falling LCLK edges, and synchronous cycles are delayed until it is sampled high. 176, 187-189 Interrupt INTR0- INTR3 O24 Outputs. Only one of these interrupts is selected to be used; the other three are tri-stated. The selection is determined by the value of INT SEL 1-0 bits in the Configuration Register. 108 nLocal Device nLDEV O16 Output. This active low output is asserted when AEN is low and A4-A15 decode to the LAN91C100FD address programmed into the high byte of the Base Address Register. nLDEV is a combinatorial decode of unlatched address and AEN signals. 177 nRead Strobe nRD IS Input. Used in asynchronous bus interfaces. 178 nWrite Strobe nWR IS Input. Used in asynchronous bus interfaces. 190 nData Path Chip Select nDATACS I with pullup Input. When nDATACS is low, the Data Path can be accessed regardless of the values of AEN, A1-A15 and the content of the BANK SELECT Register. nDATACS provides an interface for bursting to and from the LAN91C100FD 32 bits at a time. 54 EEPROM Clock EESK O4 Output. 4 μsec clock used to shift data in and out of the serial EEPROM. 55 EEPROM Select EECS O4 Output. Serial EEPROM chip select. Used for selection and command framing of the serial EEPROM. 52 EEPROM Data Out EEDO O4 Output. Connected to the DI input of the serial EEPROM. 53 EEPROM Data In EEDI I with pulldown Input. Connected to the DO output of the serial EEPROM. 13, 15, 16 I/O Base IOS0- IOS2 I with pullup Input. External switches can be connected to these lines to select between predefined EEPROM configurations. 51 Enable EEPROM ENEEP I with pullup Input. Enables (when high or open) LAN91C100FD accesses to the serial EEPROM. Must be grounded if no EEPROM is connected to the LAN91C100FD. |
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