EP3C80 datasheet(189/274 Pages) ALTERA

189 / 274 page

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

9–31

Configuration Features

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

Figure 9–11 shows the AP configuration with multiple bus masters.

Figure 9–11. AP Configuration with Multiple Bus Masters

Notes to Figure 9–11:

(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 the normal I/O to monitor the WAIT signal from the Micron P30 or P33 flash.

(5) When cascading Cyclone III devices in a multi-device AP configuration, connect the repeater buffers between the master device and slave devices

for DATA[15..0] and DCLK. All I/O inputs must maintain a maximum AC voltage of 4.1 V. The output resistance of the repeater buffers must fit

the maximum overshoot equation outlined in “Configuration and JTAG Pin I/O Requirements” on page 9–7.

(6) The other master device must fit the maximum overshoot equation outlined in “Configuration and JTAG Pin I/O Requirements” on page 9–7.

(7) The other master device can control the AP configuration bus by driving the nCE pin to high with an output high on the I/O pin.

(8) The other master device can pulse nCONFIG if it is under system control rather than tied to VCCIO.

CLK

RST#

CE#

OE#

ADV#

WE#

WAIT

DQ[15:0]

A[24:1]

DCLK (5)

nRESET

FLASH_nCE

nOE

nAVD

nWE

I/O (4)

DATA[15..0] (5)

PADD[23..0]

nCE

VCCIO (1)

10 k



10 k



MSEL[3..0]

(3)

nCEO

Cyclone III Master Device

Micron P30/P33 Flash

GND

10 k



(2)

Other Master Device (6)

VCCIO (1)

10 k



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