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LAN9500AI データシート(PDF) 16 Page - Microchip Technology |
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LAN9500AI データシート(HTML) 16 Page - Microchip Technology |
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16 / 213 page  LAN950x DS00001875A-page 16 2010 - 2015 Microchip Technology Inc. Note 3-2 Configuration strap values are latched on Power-On Reset (POR) or External Chip Reset (nRESET). Configuration straps are identified by an underlined symbol name. Pins that function as configuration straps must be augmented with an external resistor when connected to a load. Refer to Section 5.14, "Configuration Straps," on page 110 for additional information. TABLE 3-2: EEPROM PINS Num Pins Name Symbol Buffer Type Description 1 EEPROM Data In EEDI IS (PD) This pin is driven by the EEDO output of the external EEPROM. 1 EEPROM Data Out EEDO O8 (PU) This pin drives the EEDI input of the external EEPROM. Auto-MDIX Enable Configuration Strap AUTOMDIX_EN IS (PU) Determines the default Auto-MDIX setting. 0 = Auto-MDIX is disabled. 1 = Auto-MDIX is enabled. See Note 3-2 for more information on configuration straps. 1 EEPROM Chip Select EECS O8 This pin drives the chip select output of the external EEPROM. Note: The EECS output may tri-state briefly during power-up. Some EEPROM devices may be prone to false selection during this time. When an EEPROM is used, an external pull-down resistor is recommended on this signal to prevent false selection. Refer to your EEPROM manufacturer’s data sheet for additional information. 1 EEPROM Clock EECLK O8 (PD) This pin drives the EEPROM clock of the external EEPROM. Power Select Configuration Strap PWR_SEL IS (PD) Determines the default power setting when no EEPROM is present. This strap is overridden by the EEPROM. 0 = The device is bus powered. 1 = The device is self powered. See Note 3-2 for more information on configuration straps. |
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