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LAN91C111i-NS Datasheet(PDF) 12 Page - Microchip Technology |
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LAN91C111i-NS Datasheet(HTML) 12 Page - Microchip Technology |
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12 / 125 page  LAN91C111 DS00002276A-page 12 2011-2016 Microchip Technology Inc. 38 40 Asynchronous 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. ARDY is negated during Asynchronous cycle when one of the following conditions occurs: No_Wait Bit in the Configuration Register is cleared. Read FIFO contains less than 4 bytes when read. Write FIFO is full when write. 43 45 nSynchronous 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. 46 48 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. 29 31 Interrupt INTR0 O24 Interrupt Output – Active High, it’s used to interrupt the Host on a status event. Note: The selection bits used to determined by the value of INT SEL 1-0 bits in the Configuration Register are no longer required and have been set to reserved in this revision of the FEAST family of devices. 45 47 nLocal Device nLDEV O16 Output. This active low output is asserted when AEN is low and A4-A15 decode to the LAN91C111 address programmed into the high byte of the Base Address Register. nLDEV is a combinatorial decode of unlatched address and AEN signals. 31 33 nRead Strobe nRD IS** Input. Used in asynchronous bus interfaces. 32 34 nWrite Strobe nWR IS** Input. Used in asynchronous bus interfaces. 34 36 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 LAN91C111 32 bits at a time. 9 11 EEPROM Clock EESK O4 Output. 4 sec clock used to shift data in and out of the serial EEPROM. 10 12 EEPROM Select EECS O4 Output. Serial EEPROM chip select. Used for selection and command framing of the serial EEPROM. Pin No. Name Symbol Buffer Type Description TQFP QFP |
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