EP3C80 datasheet(199/274 Pages) ALTERA

199 / 274 page

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

9–41

Configuration Features

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

Figure 9–18 shows PS configuration for Cyclone III device family using a download

cable.

You can use a download cable to configure multiple Cyclone III device family by

connecting the nCEO pin of each device to the nCE pin of the subsequent device. The

nCE

pin of the first device is connected to GND while its nCEO pin is connected to the

nCE

pin of the next device in the chain. The nCE input of the last device comes from the

previous device while its nCEO pin is left floating. All other configuration pins,

nCONFIG

, nSTATUS, DCLK, DATA[0], and CONF_DONE are connected to every device in the

chain. Because all CONF_DONE pins are tied together, all devices in the chain initialize

and enter user mode at the same time.

In addition, the entire chain halts configuration if any device detects an error because

the nSTATUS pins are tied together. The Auto-restart configuration after error option

does not affect the configuration cycle because you must manually restart

configuration in the Quartus II software when an error occurs.

Figure 9–18. PS Configuration Using a USB-Blaster, MasterBlaster, ByteBlaster II,

ByteBlasterMV, or Ethernet Blaster Cable

Notes to Figure 9–18:

(1) The pull-up resistor must be connected to the same supply voltage as the VCCA supply.

(2) You only need the pull-up resistors on DATA[0] and DCLK if the download cable is the only configuration scheme

used on your board. This is to ensure that DATA[0] and DCLK are not left floating after configuration. For example,

if you are also using a configuration device, you do not need the pull-up resistors on DATA[0] and DCLK.

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

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

ByteBlaster II, ByteBlaster MV, and Ethernet Blaster, this pin is a no connect.

(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) 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 for PS configuration schemes. Connect the MSEL pins directly to VCCA or GND.

(6) Power up the VCC of the 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.

MSEL[3..0] (5)

nCONFIG

CONF_DONE

CCA (1)

CCA (6)

Shield

GND

CCA (1)

GND

VCCA (1)

10k

CCA (1)

10k

10 k

nSTATUS

Pin 1

Download Cable 10-Pin Male

Header (Top View)

GND

IO (3)

Cyclone III Device Family

nCEO

DCLK

DATA[0]

nCE

CCA (1)

N.C. (4)

(2)

10k

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