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PC87383-VS Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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PC87383-VS Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 77 page  1.0 Signal/Pin Connection and Description (Continued) www.national.com 10 Revision 1.1 1.3 DETAILED SIGNAL/PIN DESCRIPTIONS This section describes all PC87383 signals. 1.3.1 LPC Bus Interface 1.3.2 Clocks 1.3.3 Parallel Port Signal Pin(s) I/O Buffer Type Description LAD3-0 53, 51, 46, 42 I/O INPCI/OPCI LPC Address-Data. Multiplexed command, address bidirectional data and cycle status. LCLK 33 I INPCI LPC Clock. Same as PCI clock (up to 33 MHz). LDRQ 22 O OPCI LPC DMA Request. Encoded DMA request for LPC interface. LFRAME 38 I INPCI LPC Frame. Low pulse indicates the beginning of a new LPC cycle or termination of a broken cycle. LRESET 35 I INPCI LPC Reset. In a practical implementation, it is connected to the PCI system reset. SERIRQ 36 I/O INPCI/OPCI Serial IRQ. The interrupt requests are serialized over a single pin, where each IRQ level is delivered during a designated time slot. LPCPD 29 I INPCI Power Down. Indicates that the peripheral should prepare for power to be shut down on the LPC interface. CLKRUN 27 I/OD INPCI/OD6 Clock Run. Same as PCI CLKRUN. Signal Pin(s) I/O Buffer Type Description CLKIN 58 I INT Clock In. 14.318 MHz or 48 MHz clock input. Signal Pin(s) I/O Buffer Type Description ACK 28 I INT Acknowledge. Pulsed low by the printer to indicate that it has received data from the parallel port. AFD_DSTRB 57 O OD14,O14/14 AFD - Automatic Feed. When low, instructs the printer to automatically feed a line after printing each line. This pin is in TRI- STATE after a 0 is loaded into the corresponding control register bit. An external 4.7 K Ω pull-up resistor must be connected to this pin. DSTRB - Data Strobe (EPP). Active low; used in EPP mode to denote a data cycle. When the cycle is aborted, DSTRB becomes inactive (high). BUSY_WAIT 26 I INT Busy. Set high by the printer when it cannot accept another character. Wait. In EPP mode, the parallel port device uses this active low signal to extend its access cycle. ERR 54 I INT Error. Set active low by the printer when it detects an error. INIT 56 O OD14,O14/14 Initialize. When low, initializes the printer. This signal is in TRI-STATE after a 1 is loaded into the corresponding control register bit. An external 4.7 K Ω pull-up resistor must be connected to this pin. PD7-0 30, 34, 37, 39, 6, 43, 50, 52 I/O INT/O14/14 Parallel Port Data. Transfers data to and from the peripheral data bus and the appropriate parallel port data register. These signals have a high current drive capability. PE 25 I INT Paper End. Set high by the printer when it is out of paper. This pin has an internal weak pull-up or pull-down resistor. |
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Similar Description - PC87383-VS |
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