Altera Corporation

9

Configuration Devices for SRAM-Based LUT Devices Data Sheet

Figure 4. ACEX 1K, APEX 20K, APEX II, FLEX 10K, FLEX 6000, or Mercury Device Configured with an EPC2,

EPC1, or EPC1441 Configuration Device

Note (1)

Notes to Figure 4:

(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. All pull-up

resistors are 1 k

Ω. APEX 20KE pull up resistors are 10 kΩ. The OE, nCS, and nINIT_CONF pins on EPC2, EPC4,

EPC8, and EPC16 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. 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.

(3)

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. EPC4, EPC8,

EPC16, and EPC2 configuration devices cannot be used with FLEX 6000 devices. All other connections are the same

for APEX II, APEX 20K, Mercury, ACEX 1K, and FLEX devices.

(4)

The nINIT_CONF pin is only available on EPC2, EPC4, EPC8, and EPC16 devices and has an internal pull up of 1 k

Ω

through a 1-k

Ω resistor.

(5)

The nCEO pin is left unconnected.

(6)

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

(7)

This diagram is for APEX 20KE devices only.

(8)

To isolate the 1.8-V and 3.3-V power supplies when configuration 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.

LUT-Based PLD

(3)

Configuration

Device

DCLK

DATA

OE

nCS

nINIT_CONF

(4)

MSEL0

MSEL1

DCLK

DATA0

nSTATUS

CONF_DONE

nCONFIG

GND

GND

(2)

(2)

nCE

(2)

APEX 20KE PLD

(7)

Configuration

Device

DCLK

DATA

OE

nCS

nINIT_CONF

(4)

MSEL0

MSEL1

DCLK

DATA0

nSTATUS

CONF_DONE

nCONFIG

GND

GND

(2)

(2)

nCE

nCEO

nCEO

(2)

(5)

(5)

(6)

(8)

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

APEX 20K & FLEX 10K Devices

APEX 20KE Devices