EPC4 datasheet(24/36 Pages) ALTERA

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Configuration Devices for SRAM-based LUT Devices Data Sheet

3.3-V or 5.0-V Operation

EPC2, EPC1, and EPC1441 devices can configure 5.0-V, 3.3-V, or 2.5-V

devices. For each configuration device, an option must be set for 5.0-V or

3.3-V operation (EPC4, EPC8, and EPC16 devices are 3.3 V). For EPC1 and

EPC1441 configuration devices, the Use Low-Voltage Configuration EPROM

option in the Global Project Device Options dialog box (Assign menu) in

the MAX+PLUS II software sets this parameter. (For APEX 20K, APEX II,

and Mercury devices, the Quartus II software provides a similar option.)

For EPC2 devices, this option is set externally by the VCCSEL pin. In

addition, the EPC2 device has an externally controlled option, set by the

VPPSEL

pin, to adjust the programming voltage to 5.0 V or 3.3 V.

The functions of the VCCSEL and VPPSEL pins are described below.

■

VCCSEL

pin—For EPC2 configuration devices, 5.0-V or 3.3-V

operation is controlled by the VCCSEL option pin. The device

functions in 5.0-V mode when VCCSEL is connected to GND; the

device functions in 3.3-V mode when VCCSEL is connected to VCC.

■

VPPSEL

pin—The EPC2 VPP programming power pin is normally

tied to VCC. For EPC2 devices operating with a 3.3-V supply, it is

possible to improve EPC2 in-system programming times by

providing VPP with a 5.0-V supply. For all other devices, VPP must be

tied to VCC. The EPC2 device’s VPPSEL pin must be set in accordance

with the EPC2 VPP pin. If the VPP pin is supplied by a 5.0-V supply,

VPPSEL

must be connected to GND; if the VPP pin is supplied by a

3.3-V power supply, VPPSEL must be connected to VCC.

Table 8 describes the relationship between the VCC and VPP voltage levels

and the required logic level for VCCSEL and VPPSEL (i.e., high or low

logic level).

Table 8. VCCSEL & VPPSEL Pin Functions on the EPC2

VCC Voltage Level

(V)

VPP Voltage Level

(V)

VCCSEL Pin Logic

Level

VPPSEL Pin Logic

Level

3.3

High

3.3

5.0

High

Low

5.0

Low

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