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DP83907VF Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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DP83907VF Datasheet(HTML) 6 Page - National Semiconductor (TI) |
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6 / 70 page  20 Pin Description (Continued) Pin No Pin Name Type Description EXTERNAL MEMORY SUPPORT 87–94 MSD0–7 or I O–I–O MEMORY SUPPORT DATA BUSCONFIGURATION REGISTER A INPUT EEPROM SIGNALS CA0 – 7 or MOS MSD0 – 7 When RESET is inactive these pins are used to access external memory and boot DO DI SK PROM CA0 – 7 When RESET is active Configuration Register A is loaded with the data value on these pins If the user puts an external pull-up on any of these pins then the corresponding register bit is set to a 1 If the pin is left unconnected then the register bit is 0 DO DI SK When RESET goes from an active to an inactive level DP83907 will read the contents of a serial EEPROM using these signals and load the contents into internal registers These internal registers are mapped into the space taken up by the PROM in the NE2000 Architecture After the EEPROM read operation has completed these pins will revert to MSD0 – 2 (D0 e MSD0 DI e MSD1 SK e MSD2) 77–82 MSD8–15 or I O–I MEMORY SUPPORT DATA BUSCONFIGURATION REGISTER B INPUT 85 86 CB0 – 7 MOS MSD8 – 15 When RESET is inactive these pins are used to access external memory CB0 – 7 When RESET is active Configuration Register B is loaded with the data value on these pins If the user puts an external pull-up on any of these pins then the corresponding register bit is set to a 1 If the pin is left unconnected then the register bit is 0 60–67 MSA1–8 or O–I MEMORY SUPPORT ADDRESS BUSCONFIGURATION REGISTER C INPUT CC0 – 7 MOS MSA1 – 8 When RESET is inactive these pins drive the memory support address bus CC0 – 7 When RESET is active Configuration Register C is loaded with the data value on these pins If the user puts an external pull-up on any of these pins then the corresponding register bit is set to a 1 If the pin is left unconnected then the register bit is 0 68 69 MSA9 – 13 or O – I MEMORY SUPPORT ADDRESS BUSDWID EECONFIG AND SIGNATURE REGISTER 71 – 73 DWID MOS MSA9 – 13 When RESET is inactive these pins drive the memory support address bus EECONFIG DWID (MSA9) When RESET is active this input specifies whether the DP83907 is interfacing to an 8-bit or 16-bit ISA bus If the user puts an external pull-up on this pin then the bus is and SIG 5 – 7 considered to be 16-bit If the pin is left unconnected then the bus is considered to be 8-bit EECONFIG(MSA10) When RESET is active this input specifies whether the DP83907 loads the configuration from an EEPROM or from the MSD0 – 15 and MSA1 – 8 pins If the user puts an external pull-up on this pin then configuration data is loaded from the EEPROM If the pin is left unconnected then configuration data is loaded from the memory support bus SIG 5 – 7(MSA11 – 13) When RESET is active the most significant 3 bits of the signature register are loaded with the data value on these pins If the user puts an external pull-up on any of these pins then the corresponding register bit is set to a 1 If the pin is left unconnected then the register bit is 0 76 MSRD O MEMORY SUPPORT BUS READ Strobes data from the external RAM into the DP83907 via the memory support data bus MOS 74 MSWR O MEMORY SUPPORT BUS WRITE Strobes data from the DP83907 into the external RAM via the memory support data bus MOS Note Driver Types are I e Input O e Output IO e Bi-directional Output OCH e Open Collector 3ST e TRI-STATE Output TTL e TTL Compatible AUI e Attachment Unit Interface TPI e Twisted Pair Interface LED e LED Drive MOS e CMOS Level Compatible XTAL e Crystal 6 |
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