EPC4 datasheet(25/36 Pages) ALTERA

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Altera Corporation

Configuration Devices for SRAM-Based LUT Devices Data Sheet

For EPC1 and EPC1441 configuration devices, 3.3-V or 5.0-V operation is

controlled by a programming bit in the POF. The programming bit value

is determined by the core supply voltage of the targeted device during

design compilation with the MAX+PLUS II software. For example, EPC1

devices are programmed automatically to operate in 3.3-V mode when

configuring FLEX 10KA devices, which have a VCC voltage of 3.3 V. In this

example, the EPC1 device’s VCC pin is connected to a 3.3-V power supply.

Designers may choose to set the configuration device for low voltage

when using the MultiVoltTM feature, which allows an ACEX, APEX,

APEX II, FLEX, or Mercury device to bridge between systems operating

with different voltages. When compiling for 3.3-V FLEX 6000 devices, set

the configuration device for low-voltage operation. To set the EPC1 and

EPC1441 configuration devices for low-voltage operation, turn on the

Low-Voltage I/O option in the Global Project Device Options dialog box

(Assign menu) in the MAX+PLUS II software.

Configuration Chain with Multiple Voltage Levels

An EPC2 or EPC1 device can configure a device chain with multiple

voltage levels. All 3.3-V and 2.5-V ACEX, APEX, APEX II, FLEX, and

Mercury devices can be driven by higher-voltage signals.

When configuring a mixed-voltage device chain, the APEX II, APEX 20K,

Mercury, ACEX 1K, or FLEX devices’ VCCINT and VCCIO pins may be

connected to 2.5 V, 3.3 V, or 5.0 V, depending upon the device. The

configuration device may be powered at 3.3 V or 5.0 V. If an EPC1,

EPC1441, EPC1213, EPC1064, or EPC1064V configuration device is

powered at 3.3 V, the nSTATUS and CONF_DONE pull-up resistors must be

connected to 3.3 V. If these configuration devices are powered at 5.0 V, the

nSTATUS

and CONF_DONE pull-up resistors must be connected to 3.3 V or

5.0 V.

EPC4 датащи(PDF) 25 Page - Altera Corporation