EP3C80 datasheet(209/274 Pages) ALTERA

209 / 274 page

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

9–51

Configuration Features

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

To configure a single device in a JTAG chain, the programming software places all

other devices in bypass mode. In bypass mode, devices pass programming data from

the TDI pin to the TDO pin through a single bypass register without being affected

internally. This scheme enables the programming software to program or verify the

target device. Configuration data driven into the device appears on the TDO pin one

clock cycle later.

The Quartus II software verifies successful JTAG configuration upon completion. At

the end of configuration, the software checks the state of CONF_DONE through the JTAG

port. When the Quartus II software generates a .jam for a multi-device chain, it

contains instructions to have all devices in the chain initialize at the same time. If

CONF_DONE

is not high, the Quartus II software indicates that configuration has failed.

If CONF_DONE is high, the software indicates that configuration was successful. After

the configuration bitstream is serially sent using the JTAG TDI port, the TCK port

clocks an additional clock cycle to perform device initialization.

Figure 9–25. JTAG Configuration of a Single Device Using a Download Cable (1.5-V or 1.8-V VCCIO

Powering the JTAG Pins)

Notes to Figure 9–25:

(1) The resistor value can vary from 1 k

 to 10 k. Perform signal integrity analysis to select the resistor value for your

setup.

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

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

(4) 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.

(5) Connect the nCONFIG and MSEL[3..0] pins to support a non-JTAG configuration scheme. If you only use a JTAG

configuration, connect the nCONFIG pin to logic-high and the MSEL[3..0] pins to ground. In addition, pull DCLK and

DATA[0]

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

(6) Power up the VCC of the ByteBlaster II, USB-Blaster, or Ethernet Blaster cable with supply from VCCIO. The

ByteBlaster II, USB-Blaster, and Ethernet Blaster cables do not support a target supply voltage of 1.2 V. For the target

supply voltage value, refer to the ByteBlaster II Download Cable User Guide, USB-Blaster Download Cable User Guide

and Ethernet Blaster Communications Cable User Guide.

(7) In the USB-Blaster and ByteBlaster II cables, this pin is connected to nCE when it is used for AS programming;

otherwise it is a no connect.

nCE (3)

MSEL[3..0]

nCONFIG

CONF_DONE

VCCIO

VCCIO (6)

GND

VCCIO (2)

GND

VCCIO (2)

(5)

VCCIO

10 k

nSTATUS

Pin 1

GND

TCK

TDO

TMS

TDI

1 k

GND

VIO (7)

Cyclone III Device Family

nCEO

N.C. (4)

DCLK

DATA[0]

(5)

Download Cable

10-Pin Male Header (Top View)

(1)

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