EPC1 Altera Corporation, EPC1 Datasheet - Page 9

• Manufacturer Part Number: EPC1
• Description: Configuration EPROMs For Flex Devices
• Manufacturer: Altera Corporation

Altera Corporation
Figure 4. ACEX 1K, APEX 20K, APEX II, FLEX 10K, FLEX 6000, or Mercury Device Configured with an EPC2,
EPC1, or EPC1441 Configuration Device
Notes to
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Do not use EPC2 devices to configure FLEX 6000 devices.
The pull-up resistor should be connected to the same supply voltage as the configuration device. All pull-up
resistors are 1 k . APEX 20KE pull up resistors are 10 k . The OE, nCS, and nINIT_CONF pins on EPC2, EPC4,
EPC8, and EPC16 devices have internal, user-configurable 1-k 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.
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.
The nINIT_CONF pin is only available on EPC2, EPC4, EPC8, and EPC16 devices and has an internal pull up of 1 k
that is always active. If nINIT_CONF is not available or not used, nCONFIG must be pulled to V
through a 1-k resistor.
The nCEO pin is left unconnected.
To ensure successful configuration between APEX 20KE and configuration devices in all possible power-up
sequences, pull up nCONFIG to V
This diagram is for APEX 20KE devices only.
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
voltage (V
only be able to drive low or tri-state.
Figure
APEX II, ACEX 1K, Mercury, APEX 20KC,
APEX 20K & FLEX 10K Devices
APEX 20KE Devices
T
) less than or equal to 0.7 V. The diode will make the nINIT_CONF pin an open-drain pin; the pin will
4:
GND
GND
MSEL0
MSEL1
MSEL0
MSEL1
APEX 20KE PLD (7)
LUT-Based PLD (3)
CONF_DONE
CONF_DONE
CCINT
nSTATUS
nSTATUS
nCONFIG
nCONFIG
DATA0
DATA0
DCLK
DCLK
nCEO
nCEO
.
nCE
nCE
Configuration Devices for SRAM-Based LUT Devices Data Sheet
Note (1)
(5)
(5)
GND
GND
V
V
CC
CC
(2)
(2)
V
V
CCINT
CC
(2)
(2)
(6)
(8)
V
V
CC
CC
(2)
(2)
DCLK
DATA
OE
nCS
nINIT_CONF (4)
DCLK
DATA
OE
nCS
nINIT_CONF (4)
Configuration
Configuration
Device
Device
CC
either directly or
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