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USB97CFDC2-01 Datasheet(PDF) 9 Page - SMSC Corporation |
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USB97CFDC2-01 Datasheet(HTML) 9 Page - SMSC Corporation |
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9 / 24 page  SMSC DS – USB97CFDC2-01 Page 9 Rev. 02-27-07 DATASHEET PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION USB INTERFACE 59 61 USB Bus Data USB- USB+ IO-U These pins connect to the USB data signals through 33 ohm series resistors. The USB+ line should be pulled up with a 5%, 1.5K ohm resistor to indicate that this is a high speed USB device. 58 USB Transceiver Supply AVDD This is the 3.3V supply to the internal USB transceiver. 62 USB Transceiver Ground AGND This is the supply ground for the internal USB transceiver. PROGRAM MEMORY INTERFACE 38-35 Program Memory Data Bus/Option Select FD[3:0]/ OPT[3:0] IO8 These signals are used to transfer data between the internal 8051 and the external program memory when operating in external program memory mode (See ROMEN pin). When operating from internal program memory, the OPT3 pin must be tied high thru a resistor and the OPT[2:0] pins tied low thru a resistor (See configuration description section). These pins are not driven while the USB97CFDC2-01 is in SUSPEND mode and internal ROM mode is active. They are driven while in SUSPEND in external ROM mode.. 34 Program Memory Data Bus/EEPROM Input FD4/IN0 IO8 This signal is used to transfer data between the internal 8051 and the external program memory when operating in external program memory mode (See ROMEN pin). When operating from internal program memory, this pin is the input data from an external serial EEPROM that contains manufacturer specific ID and string information, as required by the USB specification, and drive options. This pin is not driven while the USB97CFDC2-01 is in SUSPEND mode and internal ROM mode is active. It is driven while in SUSPEND in external ROM mode... 33-31 Program Memory Data Bus/EEPROM Output FD[7:5]/ OUT[2:0] IO8 This signal is used to transfer data between the internal 8051 and the external program memory when operating in external program memory mode (See ROMEN pin). When operating from internal program memory, these pins are the output data and strobes to an external serial EEPROM that contains manufacturer specific ID and string information, as required by the USB specification, and drive options. These pins are driven while the USB97CFDC2-01 is in SUSPEND mode. 50, 53, 54, 49, 57, 29, 56, 55, 48- 44, 42-40, Flash Memory Address Bus FA[15:0] O8 These signals address memory locations within the FLASH memory. 28 Flash Memory Read Strobe nFRD O8 Flash ROM Read; active low 30 Flash Memory Chip Select nFCE O8 Flash ROM Chip Select; active low MISCELLANEOUS 17 Crystal Input/External Clock Input XTAL1/ CLKIN ICLKx 14.318Mhz Crystal or clock input. This pin can be connected to one terminal of the crystal or can be connected to an external 14.318Mhz clock when a crystal is not used. |
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Similar Description - USB97CFDC2-01 |
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