Page History

The module can be powered by B2B connector J5 or the USB connector. If both power supplies are available, the B2B connector power supply takes precedence, disabling the USB power supply automatically.

On Board Power Rails

Three onOn-board voltage regulators provide the following power supply rails needed by the components on the module:

• 1.2V, 4.0 A max (3.0 A max REV00)
• 2.5V, 0.8 A max
• 3.3V, 3.0 A max0 A max (1.5 A max REV01)
• 1.5V, 3.0 A max (1.0 A 5 A max REV01)

The figure below show power supply diagram.

...

 The B2B connector power supply requires a single nominal 5 V DC power supply. The power is usually supplied to the module through the 5 V contacts (5Vb2b) of B2B connector J5 (see chapter J5 Pin-out). The recommended minimum supply voltage is 4 V. The maximum supply voltage is 5.5 V. The recommended maximum continuous supply current is 1.5 A.

...

Spartan-6 architecture organizes I/Os into four I/O banks, see Table 1 see  the table below for supply voltage used for each bank.

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 connectorSee connector⁽¹⁾.

 ⁽¹⁾ See Spartan-6 documentation fo VCCIO power range.

...

...

Scroll pdf title
title Example of VCCIO0 assembly not dependent on 2.5V power rail. The other way is also possible.
Image Added

See the figure below to locate R102 and R103 on PCB.

Scroll pdf title
title R102 and R103 location

Note that some of Spartan-6 I/O types are partially compatible, so pins of compatible types can be used as inputs for signal of other type. See "Spartan-6 FPGA SelectIO Resources" page 38 for detailed information.

...