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Ultra Fast USB 2.0 Multi-Slot Flash Media Controller
Datasheet
SMSC USB2250/50i/51/51i 35 Revision 1.1 (05-29-08)
DATASHEET
Chapter 10 GPIO Usage
Table 10.1 USB2250/50i/51/51i GPIO Usage (ROM Rev 0x00)
NAME ACTIVE LEVEL SYMBOL DESCRIPTION AND NOTE
GPIO1 H LED1 LED indicator
GPIO2 H CF_DMARQ / RXD Compact Flash DMA request / Receive
Port of Debugger
GPIO3 H VBUS_DET USB Vbus detect
GPIO4 H SCL / xD_ID Serial EEPROM clock output / xD card
detect
GPIO5 H SDA Serial EEPROM data
GPIO6 L SD_WP SD Write Protect
GPIO7 H CF_DMACK / TXD Compact Flash DMA acknowledge
/Transmit Port of Debugger
GPIO8 L CRD_PWR0 Card Power Control
GPIO9 L CRD_PWR1 Card Power Control
GPIO10 L CRD_PWR2 Card Power Control
GPIO11 L CRD_PWR3 Card Power Control
GPIO12 L MS_INS Memory Stick Card Insertion
GPIO13 L CF_nCD Compact Flash card detect
GPIO14 L xD_nCD xD card detect
GPIO15 L SD_nCD Secure Digital card detect
GPIO16-32 USER GPIO [32:16] User defined