Datasheet

High-Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
Datasheet
Revision 1.3 (03-13-13) 34 SMSC USB4640/USB4640i
DATASHEET
4.4.2.3 A4h-A5h: Smart Media Device Power Configuration
4.4.2.4 A6h-A7h: Secure Digital Device Power Configuration
4.4.2.5 A8h: LED Blink Interval
4.4.2.6 A9h: LED Blink Duration
FET NAME BITS BIT TYPE DESCRIPTION
0
SM_PWR_LB
3:0 Low Nibble FET Lo Byte:
0000 : disabled
1 7:4 High Nibble
2 SM_PWR_HB 3:0 Low Nibble FET Hi Byte
0000 : disabled
0001 : external FET enabled
1000 : internal FET - 100 mA power limit
1010 : (default) internal FET - 200 mA power limit
3 7:4 High Nibble
0000 : disabled
FET NAME BITS BIT TYPE DESCRIPTION
0 SD_PWR_LB 3:0 Low Nibble FET Lo Byte:
0000 : disabled
1 7:4 High Nibble
2 SD_PWR_HB 3:0 Low Nibble FET Hi Byte
0000 : disabled
0001 : external FET enabled
1000 : internal FET - 100 mA power limit
1010 : (default) internal FET - 200 mA power limit
3 7:4 High Nibble 0000b : disabled
BYTE NAME DESCRIPTION
0 LED_BLK_INT The blink rate is programmable in 50 ms intervals. The high bit (7) indicates
an idle state:
0 : off
1 : on
The remaining bits (6:0) are used to determine the blink interval up to a max
of 128 x 50 ms.
BYTE NAME DESCRIPTION
1 LED_BLK_DUR LED Blink After Access: designates the number of seconds that the GPIO1
LED will continue to blink after a drive access. Setting this byte to
05 will
cause the GPIO 1 LED to blink for 5 seconds after a drive access.