EPC4 Altera Corporation, EPC4 Datasheet - Page 14

• Manufacturer Part Number: EPC4
• Description: Sram-based LUT Devices
• Manufacturer: 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
Notes to
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
14
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
internal, user-configurable 1-k
should not be used on these pins.
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.
EPC4, EPC8, and EPC16 devices cannot be cascaded.
The nINIT_CONF pin is only available on EPC2 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
To ensure successful configuration between APEX 20KE and configuration devices in all possible power-up
sequences, pull up nCONFIG to V
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
voltage (V
only be able to drive low or tri-state.
The nCEO pin is left unconnected.
GND
GND
Figure
APEX II, APEX 20K, Mercury, ACEX 1K,
FLEX 10K, or FLEX 6000 Devices
APEX 20KE Devices
T
5:
MSEL0
MSEL1
MSEL0
MSEL1
) less than or equal to 0.7 V. The diode will make the nINIT_CONF pin an open-drain pin; the pin will
LUT-Based PLD (4)
APEX 20KE Device
CONF_DONE
CONF_DONE
nSTATUS
nCONFIG
nSTATUS
nCONFIG
DATA0
DCLK
DATA0
DCLK
nCEO
nCE
nCE
(APEX 20KE pull-resistors are 10 k ). The OE and nCS pins on EPC2 devices have
pull-up resistors. If internal pull-up resistors are used, external pull-up resistors
Note (1)
CCINT
GND
N.C.
V
GND
V
CC
CC
(9)
.
(2)
(2, 3)
V
CCINT
(7)
(2)
(8)
V
V
CC
CC
(2, 3)
(2)
DCLK
DATA
OE
nCS
nINIT_CONF (6)
Configuration
DCLK
DATA
OE
nCS
nINIT_CONF (6)
Configuration
Device
Device 1
CC
nCASC
either directly or through a 1-k resistor.
(5)
Altera Corporation
DCLK
DATA
nCS
OE
Configuration
Device 2