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USB97CFDC2-01 Datasheet(PDF) 10 Page - SMSC Corporation |
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USB97CFDC2-01 Datasheet(HTML) 10 Page - SMSC Corporation |
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10 / 24 page  SMSC DS – USB97CFDC2-01 Page 10 Rev. 02-27-07 DATASHEET PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 18 Crystal Output XTAL2 OCLKx 14.318Mhz Crystal This is the other terminal of the crystal, or left open when an external clock source is used to drive XTAL1/CLKIN. It may not be used to drive any external circuitry other than the crystal circuit. 20 ROM Enable ROMEN IP If this input is tied high or left open, the internal program ROM is enabled. If tied low, external program memory can be used for custom applications. 24 Drive Density Output HDO I In some configurations of the USB97CFDC, this drive pin indicates if a 640/720K disk is inserted in the drive. Polarity of this signal is determined by the configuration selected by the OPT[3:0] pins at reset. If this pin is not driven by the drive, it should be tied low. 25 Drive Ready nDRVRDY I An active low signal on this pin from the floppy disk drive, after DS0 goes active, indicates that the system may activate MTR0. If the drive does not supply this signal, this pin should be tied low. 26 Drive Power nFDPWR OD24 This active low signal is intended to activate an external power switch, either in the drive or on the system board, to supply power to the floppy disk drive. It is active whenever the USB97CFDC2-01 is not in SUSPEND mode. 21 RESET input nRESET IS This active low signal is used by the system to reset the chip. The active low pulse should be at least 100ns wide. 22 Test output TSTOUT O8 This signal is used for testing the chip via an internal XNOR chain. User should normally leave it unconnected. 15 Test input nTEST I This signal is a manufacturing test pin. It should be tied to VDD for normal operation. 16 Test Enable nTESTEN I This active low signal places the device into board test mode using the XNOR chain. For normal operation this pin should be tied high. See Board Test Mode Operation on page 14 POWER, GROUND, AND NO CONNECTS 14, 39, 60, 82, 93 VDD +3.3V power 8, 19, 27, 43, 52, 66, 79, 81, 88 GND Ground Reference 1-7, 9-13, 23, 51, 78, 80, 83-87, 89-92, 94-100 NC No Connect. These pins should not be connected externally. |
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