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COM20019I-LJP Datasheet(PDF) 8 Page - SMSC Corporation |
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COM20019I-LJP Datasheet(HTML) 8 Page - SMSC Corporation |
8 / 65 page Low Cost ARCNET (ANSI 878.1) Controller with 2K x 8 On-Board RAM Rev. 04-15-05 Page 8 SMSC COM20019I DATASHEET Chapter 3 DESCRIPTION OF PIN FUNCTIONS PLCC PIN NO. NAME SYMBOL DESCRIPTION MICROCONTROLLER INTERFACE 1-3 Address 0-2 A0/nMUX, A1,A2/ALE Input. On a non-multiplexed mode, A0-A2 are address input bits. (A0 is the LSB) On a multiplexed address/data bus, nMUX tied Low, A1 is left open, and ALE is tied to the Address Latch Enable signal. A1 is connected to an internal pull-up resistor. 4-6,8-12 Data 0-7 AD0-AD2, D3- D7 Input/Output. On a non-multiplexed bus, these signals are used as the data lines for the device. On a multiplexed address/data bus, AD0-AD2 act as the address lines (latched by ALE) and as the low data lines for the device. D3-D7 are always used for data only. These signals are connected to internal pull-up resistors. 27 nRead/nData Strobe nRD/nDS Input. On a 68XX-like bus, nDS is an active low signal issued by the microcontroller as the data strobe signal to strobe the data onto the bus. On a 80XX-like bus, nRD is an active low signal issued by the microcontroller to indicate a read operation. 26 nWrite/ Direction nWR/DIR Input. On a 68XX-like bus, DIR is issued by the microcontroller as the Read/nWrite signal to determine the direction of data transfer. In this case, a logic "1" selects a read operation, while a logic "0" selects a write operation. In this case, data is actually strobed by the nDS signal. On an 80XX-like bus, nWR is an active low signal issued by the microcontroller to indicate a write operation. In this case, a logic "0" on this pin, when the COM20019I is accessed, enables data from the data bus to be written to the device. 23 nReset in nRESET Input. This active low signal executes a hardware reset. 24 nInterrupt nINTR Output. This active low signal is generated by the COM20019I when an enabled interrupt condition occurs. 25 nChip Select nCS Input. This active low signal selects the COM20019I for an access. |
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