EP3C80 datasheet(180/274 Pages) ALTERA

180 / 274 page

9–22

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

Figure 9–7 shows the download cable connections to the serial configuration device.

You can use the Quartus II software with the APU and the appropriate configuration

device programming adapter to program serial configuration devices. All serial

configuration devices are offered in an 8- or 16-pin small outline integrated circuit

(SOIC) package.

Figure 9–7. In-System Programming of Serial Configuration Devices

Notes to Figure 9–7:

(1) Connect these pull-up resistors to the VCCIO supply of the bank in which the pin resides.

(2) The nCEO pin is left unconnected or used as a user I/O pin when it does not feed the nCE pin of another device.

(3) Power up the VCC of the ByteBlaster II or USB-Blaster download cable with the 3.3-V supply.

(4) The MSEL pin settings vary for different configuration voltage standards and POR time. To connect MSEL[3..0], refer to Table 9–7 on page 9–11.

Connect the MSEL pins directly to VCCA or ground.

(5) These are dual-purpose I/O pins. This nCSO pin functions as the FLASH_NCE pin in AP mode. The ASDO pin functions as the DATA[1] pin in other

AP and FPP modes.

(6) The diodes and capacitors must be placed as close as possible to the Cyclone III device family. Ensure that the diodes and capacitors maintain a

maximum AC voltage of 4.1 V. The external diodes and capacitors are required to prevent damage to the Cyclone III device family AS configuration

input pins due to possible overshoot when programming the serial configuration device using a download cable. For effective voltage clamping,

Altera recommends using the Schottky diode, which has a relatively lower forward diode voltage (VF) than the switching and Zener diodes. For

more information about the interface guidelines using Schottky diodes, refer to AN 523: Cyclone III Configuration Interface Guidelines with EPCS

Devices.

(7) When cascading Cyclone III device family in a multi-device AS configuration, connect the repeater buffers between the master and slave devices

for DATA[0] and DCLK. All I/O inputs must maintain a maximum AC voltage of 4.1 V. The output resistance of the repeater buffers must fit the

maximum overshoot equation outlined in “Configuration and JTAG Pin I/O Requirements” on page 9–7.

nSTATUS

nCONFIG

CONF_DONE

nCE

DATA[0] (7)

DCLK (7)

nCSO (5)

ASDO (5)

nCEO

MSEL[3..0]

(4)

Cyclone III Device Family

DATA

DCLK

nCS

ASDI

Serial

Configuration Device

GND

N.C. (2)

VCCIO (1)

3.3 V (3)

GND

Pin 1

ByteBlaster II or USB Blaster

10-Pin Male Header

3.3 V

10 pf

GND

10 pf

(6)

10 pf

GND

10 pf

GND

(6)

10 k

3.3 V

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