EP4CE40 datasheet(189/488 Pages) ALTERA

189 / 488 page

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

8–25

Configuration

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

1 There are no series resistors required in AP configuration mode for Cyclone IV E

devices when using the Micron flash at 2.5-, 3.0-, and 3.3-V I/O standard. The output

buffer of the Micron P30 IBIS model does not overshoot above 4.1 V. Thus, series

resistors are not required for the 2.5-, 3.0-, and 3.3-V AP configuration option.

However, if there are any other devices sharing the same flash I/Os with Cyclone IV E

devices, all shared pins are still subject to the 4.1-V limit and may require series

resistors.

Default read mode of the supported parallel flash memory and all writes to the

parallel flash memory are asynchronous. Both the parallel flash families support a

synchronous read mode, with data supplied on the positive edge of DCLK.

The serial clock (DCLK) generated by Cyclone IV E devices controls the entire

configuration cycle and provides timing for the parallel interface.

Multi-Device AP Configuration

You can configure multiple Cyclone IV E devices using a single parallel flash. You can

cascade multiple Cyclone IV E devices using the chip-enable (nCE) and

chip-enable-out (nCEO) pins. The first device in the chain must have its nCE pin

connected to GND. You must connect its nCEO pin to the nCE pin of the next device in

the chain. Use an external 10-k

Ω pull-up resistor to pull the nCEO signal high to its

VCCIO level to help the internal weak pull-up resistor. When the first device captures

all its configuration data from the bitstream, it drives the nCEO pin low, enabling the

next device in the chain. You can leave the nCEO pin of the last device unconnected or

use it as a user I/O pin after configuration if the last device in the chain is a

Cyclone IV E device. The nCONFIG, nSTATUS, CONF_DONE, DCLK, DATA[15..8], and

DATA[7..0]

pins of each device in the chain are connected (Figure 8–8 on page 8–26

and Figure 8–9 on page 8–27).

The first Cyclone IV E device in the chain, as shown in Figure 8–8 on page 8–26 and

Figure 8–9 on page 8–27, is the configuration master device and controls the

configuration of the entire chain. You must connect its MSEL pins to select the AP

configuration scheme. The remaining Cyclone IV E devices are used as configuration

slaves. You must connect their MSEL pins to select the FPP configuration scheme. Any

other Altera device that supports FPP configuration can also be part of the chain as a

configuration slave.

The following are the configurations for the DATA[15..0] bus in a multi-device AP

configuration:

■

Byte-wide multi-device AP configuration

■

Word-wide multi-device AP configuration

EP4CE40 Datasheet(PDF) 189 Page - Altera Corporation

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