TE0630 is provided with a slide Dip switch S1B.
Slide 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 power rails.
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Figure 33: Slide switch S1B (angle view).
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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.
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title | Dip switch S1[A:D]. The switch S1B is the one with label 2 and B |
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title | Dip switch S1B schematic. |
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When S1B is turned on 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 power rails 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 power rails on, if enough current is available from the USB bus.
When S1B is turned off on (PON position), the power rails 1.2 V, 1.5 V and 2.5 V power rails are always enabled (switched on).
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title | Dip switch S1B settings overview (power rails 1.2 V, 1.5V and 2.5 V only). |
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FX2 PON (off) | | Power rails 1.2 V, 1.5 V and 2.5 V |
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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. |
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always enabled (PS_EN = 1) PS_EN ≠ FX_PS_EN = 1 or 0 |
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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
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title | Table from EZ-USB(R) Technical Reference Manual (EZ-USB_TRM.pdf). |
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Table from EZ-USB(R) Technical Reference Manual (EZ-USB_TRM.pdf) |
.[7:0] | FD[15:8] | IFCFG1 = 1 and any WORDWIIDE bit = 1 | Slave FIFOs chapter 9 on page 99 |
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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.
5V 5 V and
12.
2V5 V.
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Figure 36: Scroll pdf title |
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title | Power rails 1.2 V, 1. |
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5V 12V 5 V could be enabled/disabled by signal PS_EN. |
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Power-rail 3.3V is not controlled by signal PS_EN and is unconditionally enabled. Image Removed
Figure 37:
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title | Power rails 3.3V could not be enabled/disabled by signal PS_EN. |
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VCCIO assembly options
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According to the corresponding assembly option, power rail VCCCIO0 |
can (enabled by PS_EN and switch S1B ) can depend or not on the power rail 2.5V |
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Figure 37: example of VCCIO0 assembly not dependent on 2.5V power rail. The other way is also possible.
Slide See section "FPGA I/O banks power supply" here.
Dip Switch S1B = FX2 PON
When slide 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).
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title | S1B on position FX2 PON (PS_EN = FX2_PS_EN = 1 or 0 ). |
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- 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 rails 1.2 V, 1.5V 5 V and 12.2V 5 V are enabled.
This setting can be useful for . - 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:
2V5V 3 25VVREF 25V5V R131R132
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Dip Switch S1B = PON
Table 14 The table below summarizes all switching options implied by slide Dip switch S1B and firmware signal FX2_PS_EN (under the standard assembly option).
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title | Dip switch S1B settings overview ( 1.2 V, 1.5 V , 2.5 V, VCCIO0). |
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assembly (1) | on | on | off | VCCCIO0 (= 3. |
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R102 unpopulated / R103 populated (2) |
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Table 40: Slide switch S1B settings overview ( 1.2V , 2.5V, VCCIO0).
Alternate Assembly Options for Slide Switch S1B
Slide switch S1B can be replaced by one resistors in the following cases:
- cost sensitive applications
- applications where just one position of S1B is required
- application where switching of S1B is not allowed.
Assembly option when resistor R17 not populated and R19 populated is equivalent to slide switch S1B permanently set to PON.
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Figure 41: assembly option: S1B = PON.
Assembly option when resistor R17 populated and R19 not populated is equivalent to slide switch S1B permanently set to FX2 PON.
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Figure 42: Assembly option: S1B = FX2 PON.
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R102 populated / R103 unpopulated |