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High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller
Datasheet
Revision 1.0 (06-01-09) 62 SMSC USB4640/USB4640i
DATASHEET
Chapter 11 GPIO Usage
Table 11.1 USB4640/USB4640i GPIO Usage
NAME
ACTIVE
LEVEL SYMBOL DESCRIPTION AND NOTE
GPIO1 H LED / TxD LED indicator / Serial port transmit line
GPIO2 H RxD Serial port receive line
GPIO4 H SCL Serial EEPROM clock
GPIO5 H SDA Serial EEPROM data
GPIO6 L SD_WP Secure Digital card write protect assertion
GPIO10 L CRD_PWR_CTRL Card power control
GPIO12 L MS_nCD Memory Stick card detect
GPIO14 L xD_nCD xD-Picture card detect
GPIO15 L SD_nCD Secure Digital card detect