Page History
...
DIP slide switches S1[A:D] condition the value of some system signals as described in the table below.
Note. DNP: Do Not Populate aka Do Not Solder the Component associated to DNP label.
| Scroll pdf title | ||
|---|---|---|
| ||
 |
...
| Scroll pdf title | ||
|---|---|---|
| ||
 |
When S1B is turned off (open) (FX2 PON position), the 1.2 V, 1.5 V and 2.5 V power rails are controlled by the USB (EZ-USB FX2LP USB FX2) microcontroller. At start-up, the USB microcontroller switches off the power rails 1.2 V, 1.5 V and 2.5 V and starts up the module in low-power mode. After enumeration, the USB microcontroller firmware enables (switches on) the power rails 1.2 V, 1.5 V and 2.5 V, if enough current is available from the USB bus.
...
| Scroll pdf title | ||||||||
|---|---|---|---|---|---|---|---|---|
| ||||||||
Table from EZ-USB(R) Technical Reference Manual (EZ-USB_TRM.pdf)
|
Signal PS_EN
Signal PS_EN enables (1) or disables (0) power rails 1.2 V, 1.5 V and 2.5 V.
Scroll pdf title title Power rails 1.2 V, 1.5 V and 2.5 V could be enabled/disabled by signal PS_EN. 
Power-rail 3.3V is not controlled by signal PS_EN and is unconditionally enabled.
Scroll pdf title title Power rails 3.3V could not be enabled/disabled by signal PS_EN. 
VCCIO assembly options
According to the corresponding assembly option, power rail VCCCIO0 can depend or not on the power rail 2.5V.
VCCIO0 voltage can be configured in 3 ways:
- 2.5V - When resistor R103 is populated and resistor R102 is not populated.
- 3.3V - When R103 is not populated and resistor R102 is populated.
- 1.2 V ÷ 3.3 V (External supply) - When R103 is not populated and R102 is not populated. In this case external supply source have to be connected to pins 1, 2, 3, 4 of J4 B2B connector(1).
(1) See Spartan-6 documentation fo VCCIO power range.
| Scroll pdf title | ||
|---|---|---|
| ||
 |
...
Overview
Content Tools