EP3C80 datasheet(176/274 Pages) ALTERA

176 / 274 page

9–18

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

1 You can still use this method if the master and slave devices use the same .sof.

Figure 9–5. Multi-Device AS Configuration where the Devices Receive the Same Data with Multiple SRAM Object Files

Notes to Figure 9–5:

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

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

(3) 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.

(4) The MSEL pin settings vary for different configuration voltage standards and POR time. You must set the master device in AS mode and the slave

devices in PS mode. To connect MSEL[3..0] for the master device in AS mode and the slave devices in PS mode, refer to Table 9–7 on page 9–11.

Connect the MSEL pins directly to VCCA or GND.

(5) These are dual-purpose I/O pins. The nCSO pin functions as the FLASH_NCE pin in AP mode. The ASDO pin functions as the DATA[1] pin in other

AP and FPP modes.

(6) Connect the series resistor at the near end of the serial configuration device.

(7) Connect the repeater buffers between the master and slave devices for DATA[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.

(8) The 50-

 series resistors are optional if the 3.3-V configuration voltage standard is applied. For optimal signal integrity, connect these 50- series

resistors if the 2.5- or 3.0-V configuration voltage standard is applied.

nSTATUS

nCONFIG

CONF_DONE

nCE

DATA[0]

DCLK

nCEO

MSEL[3..0]

N.C. (3)

(4)

Slave Device of the Cyclone III Device Family

nSTATUS

nCONFIG

CONF_DONE

nCE

DATA[0]

DCLK

nCEO

MSEL[3..0]

N.C. (3)

(4)

VCCIO (1)

nSTATUS

nCONFIG

CONF_DONE

nCE

DATA[0]

DCLK

nCEO

MSEL[3..0]

N.C. (3)

(4)

nSTATUS

nCONFIG

CONF_DONE

nCE

DATA[0]

DCLK

nCSO (5)

ASDO (5)

nCEO

MSEL[3..0]

(4)

DATA

DCLK

nCS

ASDI

Serial Configuration

Device

GND

VCCIO (1)

VCCIO (2)

10 k

(6)

(6),

(8)

Buffers (7)

(8)

Slave Device of the Cyclone III Device Family

Master Device of the

Cyclone III Device

Family

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