TE0630 Dip Switch S1B (Configuration)

TE0630 is provided with a Dip switch S1B.
Dip switch S1B conditions the value of signal PS_EN.
In this way, S1B conditionally/unconditionally enables the power rails 1.2 V, 1.5 V and 2.5 V.

Please note the 4 switch labels are on one side and the <ON> label is on the opposite side.

DIP slide switches S1[A:D] condition the value of some system signals as described in the table below.

Dip switch S1[A:D]. The switch S1B is the one with label 2 and B

Dip switch S1B schematic.

When S1B = FX2 PON, PS_EN=FX2_PS_EN

When S1B is turned off  (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.

When S1B is turned on (PON position), the power rails 1.2 V, 1.5 V and 2.5 V are always enabled (switched on).

S1B position	Default position	Effect on 1.2 V, 1.5 V and 2.5 V rails
FX2 PON (off)		Power rails 1.2 V, 1.5 V and 2.5 V controlled by USB FX2 microcontroller (signal FX2_PS_EN) PS_EN = FX2_PS_EN = 1 or 0
PON (on)		Power rails 1.2 V, 1.5 V and 2.5 V always enabled (PS_EN = 1) PS_EN ≠ FX_PS_EN = 1 or 0

Dip switch S1B settings overview (power rails 1.2 V, 1.5V and 2.5 V only).

Signal FX2_PS_EN

To command signal FX2_PS_EN, read the reference firmware code.
IOD = 0x03; // Enable PS_EN and disable PROG_B
OED = 0x03; // Configure PS_EN and PROG as outputs

When Dip switch S1B is in the left position ( = FX2 PON : power rails conditionally on depending on signal FX2_PS_EN), signal PS_EN is set to signal FX2_PS_EN (PS_EN = FX2_PS_EN) driven by the EZ-USB FX2LP USB FX2 microcontroller under user control (IOD and OED of fw.c).

1. Dynamic full power operation (PS_EN = 1): when the EZ-USB FX2LP USB FX2 microcontroller sets signal PS_EN = FX2_PS_EN = high, power rails 1.2 V, 1.5 V and 2.5 V are enabled.
   This setting can be useful for .
2. Dynamic low power operation (PS_EN = 0): when the EZ-USB FX2LP USB FX2 microcontroller resets signal PS_EN = FX2_PS_EN = low, the following components are switched off:

• • FPGA core logic (1.2 V)
  • DDR SDRAM (2.5 V)
  • FPGA bank 1 (1.5 V)
  • VREF1 (0.75 V)
  • VCCCIO0 (2.5 V) FPGA bank 0 (if R102+R103- assembly)

Dip Switch S1B = PON 

The table below summarizes all switching options implied by Dip switch S1B and firmware signal FX2_PS_EN (under the standard assembly option).