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FDC37B774 Scheda tecnica(PDF) 8 Page - SMSC Corporation |
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FDC37B774 Scheda tecnica(HTML) 8 Page - SMSC Corporation |
8 / 196 page 8 DESCRIPTION OF PIN FUNCTIONS PIN No./QFP NAME TOTAL SYMBOL BUFFER TYPE 97 Data Set Ready 2/Sys Addr 15 1 nDSR2/ SA15 I/I 94 Data Carrier Detect 2/8042 P12 1 nDCD2/P12 I/IO24 92 Ring Indicator 2/8042 P16 1 nRI2/P16 I/IO24 PARALLEL PORT INTERFACE (17) 68:75 Parallel Port Data Bus 8 PD[0:7] IO24 67 Printer Select 1 nSLCTIN OD24/O24 66 Initiate Output 1 nINIT OD24/O24 82 Auto Line Feed 1 nALF OD24/O24 83 Strobe Signal 1 nSTROBE OD24/O24 79 Busy Signal 1 BUSY I 80 Acknowledge Handshake 1 nACK I 78 Paper End 1 PE I 77 Printer Selected 1 SLCT I 81 Error at Printer 1 nERROR I KEYBOARD/MOUSE INTERFACE (6) 56 Keyboard Data 1 KDAT IOD16 57 Keyboard Clock 1 KCLK IOD16 58 Mouse Data 1 MDAT IOD16 59 Mouse Clock 1 MCLK IOD16 63 Keyboard Reset 1 KBDRST (Note 3) O4 64 Gate A20 1 A20M O4 Note 1: For 12 bit addressing, SA0:SA11 only, nCS should be tied to GND. For 16 bit external address qualification, address bits SA11:SA15 can be "ORed" together and applied to nCS. The nCS pin functions as SA11 in full 16 bit Internal Address Qualification Mode. CR24.6 controls the FDC37B77x addressing modes. Note 2: The "n" as the first letter of a signal name indicates an "Active Low" signal. Note 3: KBDRST is active low. Note 4: The pull-down on this pin is always active including when the output driver is tristated and regardless of the state of internal PWRGOOD. Note 5: The “activate” bit for the CIrCC is reset by VTR POR only. The VCC power-up default for this pin is Logic “0”. Note 6: The “activate” bit for Serial Port 2 is reset by VTR POR only. The VCC power-up default for this pin is Logic “1”. |
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