Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo
Revision 2.0 (10-03-08)
50
SMSC USB2640/USB2641
DATASHEET
Chapter 8 Pin Reset States
Figure 8.1 Pin Reset States
8.1
Pin Reset States
Table 8.1 Legend for Pin Reset States Table
SYMBOL
DESCRIPTION
Y
Hardware enables function
0
Ouput low
1
Output high
--
Hardware disables function
Z
Hardware disables output driver (high impedance)
PU
Hardware enables pullup
PD
Hardware enables pulldown
HW
Hardware controls function, but state is protocol dependent
(FW)
Firmware controls function through registers
VDD
Hardware supplies power through pin, applicable only to
CARD_PWR pins
none
Hardware disables pad
Table 8.2 USB2640 Pin Reset States
RESET STATE
PIN
PIN NAME
FUNCTION
OUTPUT
PU/
PD
INPUT
1
USBDN_DM2
USBDN_DM2
0
PD
--
2
USBDN_DP2
USBDN_DP2
0
PD
--
Voltage
Signal (v)
Time
(t)
RESET
RESET
Hardware
Initialization
Firmware
Operational
V
DD33
V
SS
