EP3C80 datasheet(184/274 Pages) ALTERA

184 / 274 page

9–26

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

Configuration Features

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

The interface for the Micron P30 flash memory and P33 flash memory connects to

Cyclone III device pins, as shown in Figure 9–8.

1 To tri-state the configuration bus for AP configuration schemes, you must tie nCE high

and nCONFIG low.

1 In a single-device AP configuration, the maximum board loading and board trace

length between the supported parallel flash and Cyclone III devices must follow the

recommendations listed in Table 9–12 on page 9–30.

1 If you use the AP configuration scheme for Cyclone III devices, the VCCIO of I/O

banks 1, 6, 7, and 8 must be 3.3, 3.0, 2.5, or 1.8 V. Altera does not recommend using the

level shifter between the Micron P30/P33 flash and the Cyclone III device in the AP

configuration scheme.

Figure 9–8. Single-Device AP Configuration Using Micron P30 and P33 Flash Memory

Notes to Figure 9–8:

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

(2) 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.

(3) 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.

Connect the MSEL pins directly to VCCA or GND.

(4) The AP configuration ignores the WAIT signal during configuration mode. However, if you are accessing flash during user mode with user logic,

you can optionally use a normal I/O to monitor the WAIT signal from the Micron P30 or P33 flash.

CLK

RST#

CE#

OE#

ADV#

WE#

WAIT

DQ[15:0]

A[24:1]

DCLK

nRESET

FLASH_nCE

nOE

nAVD

nWE

I/O (4)

DATA[15..0]

PADD[23..0]

nCE

VCCIO (1) VCCIO (1)

10k



10k



MSEL[3..0]

(3)

nCEO

N.C. (2)

Cyclone III Device

Micron P30/P33 Flash

GND

VCCIO (1)

10k



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