CDPCLK4 datasheet(170/274 Pages) ALTERA

170 / 274 page

9–12

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family

Configuration Features

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

AS Configuration (Serial Configuration Devices)

In the AS configuration scheme, Cyclone III device family is configured using a serial

configuration device. These configuration devices are low-cost devices with

non-volatile memories that feature a simple four-pin interface and a small form factor.

These features make serial configuration devices the ideal low-cost configuration

solution.

f For more information about serial configuration devices, refer to the Serial

Configuration Devices (EPCS1, EPCS4, EPCS16, EPCS64, and EPCS128) Data Sheet

chapter in volume 2 of the Configuration Handbook.

In Cyclone III device family, the active master clock frequency runs at a maximum of

40 MHz, and typically at 30 MHz. Cyclone III device family only work with serial

configuration devices that support up to 40 MHz.

Serial configuration devices provide a serial interface to access configuration data.

During device configuration, Cyclone III device family reads configuration data using

the serial interface, decompress data if necessary, and configure their SRAM cells. This

scheme is referred to as the AS configuration scheme because the device controls the

configuration interface.

Active Parallel ×16 Fast (AP Fast POR, for

Cyclone III devices only)

1.8

Passive Serial Standard (PS Standard POR)

3.3/3.0/2.5

Passive Serial Fast (PS Fast POR)

3.3/3.0/2.5

Fast Passive Parallel Fast (FPP Fast POR) (4)

3.3/3.0/2.5

Fast Passive Parallel Fast (FPP Fast POR)

(for Cyclone III devices only) (4)

1.8/1.5

Fast Passive Parallel Fast (FPP Fast POR)

(for Cyclone III LS devices only)

1.8/1.5

Fast Passive Parallel Fast (FPP Fast POR)

with Encryption (for Cyclone III LS

devices only)

3.3/3.0/2.5

Fast Passive Parallel Fast (FPP Fast POR)

with Encryption (for Cyclone III LS

devices only)

1.8/1.5

JTAG-based configuration (5)

(6)

—

Notes to Table 9–7:

(1) Altera recommends connecting the MSEL pins to VCCA or GND depending on the MSEL pin settings.

(2) The configuration voltage standard is applied to the VCCIO supply of the bank in which the configuration pins reside.

(3) You must follow specific requirements when interfacing Cyclone III device family with 2.5-, 3.0-, and 3.3-V configuration voltage standards. For

more information about these requirements, refer to “Configuration and JTAG Pin I/O Requirements” on page 9–7.

(4) FPP configuration is not supported in the Cyclone III E144 device package of Cyclone III devices.

(5) The JTAG-based configuration takes precedence over other configuration schemes, which means the MSEL pin settings are ignored.

(6) Do not leave the MSEL pins floating. Connect them to VCCA or GND. These pins support the non-JTAG configuration scheme used in production.

Altera recommends connecting the MSEL pins to GND if your device is only using the JTAG configuration.

Table 9–7. Cyclone III Device Family Configuration Schemes (1) (Part 2 of 2)

Configuration Scheme

MSEL

Configuration Voltage Standard (V)

(2), (3)

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