EP4CE40 datasheet(203/488 Pages) ALTERA

203 / 488 page

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

8–39

Configuration

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

You can use a download cable to configure multiple Cyclone IV device configuration

pins. nCONFIG, nSTATUS, DCLK, DATA[0], and CONF_DONE are connected to every device in

the chain. All devices in the chain utilize and enter user mode at the same time

because all CONF_DONE pins are tied together.

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

the nSTATUS pins are tied together. Figure 8–18 shows the PS configuration for

multiple Cyclone IV devices using a MasterBlaster, USB-Blaster, ByteBlaster II, or

ByteBlasterMV cable.

Figure 8–18. Multi-Device PS Configuration Using a Download Cable

Notes to Figure 8–18:

(1) You must connect the pull-up resistor to the same supply voltage as the VCCA supply.

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

used on your board. This ensures that DATA[0] and DCLK are not left floating after configuration. For example, if you

also use a configuration device, the pull-up resistors on DATA[0] and DCLK are not required.

(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. When using the

ByteBlasterMV download cable, this pin is a no connect. When using USB-Blaster, ByteBlaster II, and EthernetBlaster

cables, this pin is connected to nCE when it is used for AS programming. Otherwise, it is a no connect.

(4) Connect the pull-up resistor to the VCCIO supply voltage of the I/O bank in which the nCE pin resides.

(5) The nCEO pin of the last device in the chain is left unconnected or used as a user I/O pin.

(6) The MSEL pin settings vary for different configuration voltage standards and POR time. To connect MSEL for PS

configuration schemes, refer to Table 8–3 on page 8–8, Table 8–4 on page 8–8, and Table 8–5 on page 8–9. Connect

the MSEL pins directly to VCCA or GND.

(7) 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.

Cyclone IV Device 1

Cyclone IV Device 2

MSEL[ ] (6)

nCE

nCONFIG

CONF_DONE

DCLK

nCE

nCEO

nCONFIG

CONF_DONE

DCLK

nCEO

GND

(Passive Serial Mode)

VCCA (7)

VCCA (1)

GND

VCCA (1)

nSTATUS

DATA[0]

MSEL[ ]

(6)

Pin 1

Download Cable

10-Pin Male Header

N.C. (5)

VIO (3)

GND

VCCA (1)

(2)

VCCA (1)

(2)

VCCIO (4)

10 k

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