EP4CE40 datasheet(211/488 Pages) ALTERA

211 / 488 page

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices

8–47

Configuration

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

For device using VCCIO of 2.5, 3.0, and 3.3 V, refer to Figure 8–23. All I/O inputs must

maintain a maximum AC voltage of 4.1 V because JTAG pins do not have the internal

PCI clamping diodes to prevent voltage overshoot when using VCCIO of 2.5, 3.0, and

3.3 V. You must power up the VCC of the download cable with a 2.5-V supply from

VCCA. For device using VCCIO of 1.2, 1.5, and 1.8 V, refer to Figure 8–24. You can power

up the VCC of the download cable with the supply from VCCIO.

Figure 8–23. JTAG Configuration of a Single Device Using a Download Cable (2.5, 3.0, and 3.3-V

VCCIO Powering the JTAG Pins)

Notes to Figure 8–23:

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

(2) Connect the nCONFIG and MSEL pins to support a non-JTAG configuration scheme. If you only use JTAG

configuration, connect the nCONFIG pin to logic-high and the MSEL pins to GND. In addition, pull DCLK and DATA[0]

to either high or low, whichever is convenient on your board.

(3) Pin 6 of the header is a VIO reference voltage for the MasterBlaster output driver. VIO must match the device’s VCCA.

For this value, refer to the MasterBlaster Serial/USB Communications Cable User Guide. When using the USB-Blaster,

ByteBlaster II, ByteBlasterMV, and EthernetBlaster cables, this pin is a no connect.

(4) The nCE pin must be connected to GND or driven low for successful JTAG configuration.

(5) 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.

(6) Power up the VCC of the EthernetBlaster, ByteBlaster II, USB-Blaster, or ByteBlasterMV cable with a 2.5-V supply from

VCCA. Third-party programmers must switch to 2.5 V. Pin 4 of the header is a VCC power supply for the MasterBlaster

cable. The MasterBlaster cable can receive power from either 5.0- or 3.3-V circuit boards, DC power supply, or 5.0 V

from the USB cable. For this value, refer to the MasterBlaster Serial/USB Communications Cable User Guide.

(7) Resistor value can vary from 1 k

Ω to 10 kΩ..

nCE (4)

MSEL[ ]

nCONFIG

CONF_DONE

VCCA

VCCA (6)

GND

VCCIO (1)

GND

VCCIO (1)

(2)

VCCA

10 k

(7)

nSTATUS

Pin 1

Download Cable 10-Pin Male

Header (Top View)

GND

TCK

TDO

TMS

TDI

GND

VIO (3)

Cyclone IV Device

nCEO

N.C. (5)

DCLK

DATA[0]

(2)

(7)

1 k

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