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Altera Corporation

Configuration Devices for SRAM-based LUT Devices Data Sheet

Figure 5. APEX II, APEX 20K, Mercury, ACEX 1K, FLEX 10K, or FLEX 6000 Device Configured with Two EPC2

or EPC1 Configuration Devices

Note (1)

Notes to

Figure 5:

(1)

Do not use EPC2 devices to configure FLEX 6000 devices.

(2)

The pull-up resistor should be connected to the same supply voltage as the configuration device.

(3)

All pull-up resistors are 1 k

Ω (APEX 20KE pull-resistors are 10 kΩ). The OE and nCS pins on EPC2 devices have

internal, user-configurable 1-k

Ω pull-up resistors. If internal pull-up resistors are used, external pull-up resistors

should not be used on these pins.

(4)

The diagram shows an APEX II, APEX 20K, Mercury, ACEX 1K, and FLEX device, which has MSEL0 and MSEL1

tied to ground. For FLEX 6000 devices, MSEL is tied to ground, and the DATA0 pin is named DATA. EPC8, EPC16,

and EPC2 devices cannot be used with FLEX 6000 devices. All other connections are the same for FLEX 6000

devices. The Quartus II software uses the internal pull-up resistors by default. To turn off the internal pull-up

resistors, check the Disable nCS and OE pull-ups on configuration device option when generating programming files.

(5)

EPC4, EPC8, and EPC16 devices cannot be cascaded.

(6)

The nINIT_CONF pin is only available on EPC2 devices and has an internal pull up of 1 k

Ω that is always active. If

nINIT_CONF

(7)

To ensure successful configuration between APEX 20KE and configuration devices in all possible power-up

(8)

To isolate the 1.8-V and 3.3-V power supplies when configuring APEX 20KE devices, add a diode between the

APEX 20KE device’s nCONFIG pin and the configuration device’s nINIT_CONF pin. Select a diode with a threshold

only be able to drive low or tri-state.

(9)

The nCEO pin is left unconnected.

GND

GND

(2, 3)

DCLK

DATA

nCS

OE

(2, 3)

LUT-Based PLD (4)

MSEL0

MSEL1

DCLK

DATA0

nSTATUS

CONF_DONE

nCONFIG

nCE

Configuration

Device 1

Configuration

Device 2

DCLK

DATA

OE

nCS

nINIT_CONF(6)

(5)

nCASC

APEX 20KE Device

Configuration

Device

DCLK

DATA

OE

nCS

nINIT_CONF (6)

MSEL0

MSEL1

DCLK

DATA0

nSTATUS

CONF_DONE

nCONFIG

GND

GND

(2)

(2)

nCE

nCEO

(2)

(9)

(7)

(8)

APEX 20KE Devices

APEX II, APEX 20K, Mercury, ACEX 1K,

FLEX 10K, or FLEX 6000 Devices

N.C.