EP2C5T144I8N Datasheet, PDF (392/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

PS Configuration
Figure 13–14. Multiple Device PS Configuration Using an Enhanced Configuration Device
VCC (4)
VCC (1)
VCC (1)
10 kΩ
10 kΩ (3) 10 kΩ (3)
VCC
GND
Cyclone II Device 2
MSEL0
MSEL1
DCLK
DATA0
nSTATUS
CONF_DONE
nCONFIG
(5) N.C. nCEO
nCE
VCC
GND
Cyclone II Device 1
MSEL0
MSEL1
DCLK
DATA0
nSTATUS
CONF_DONE
nCONFIG
nCEO
nCE
GND
Enhanced
Configuration
Device
DCLK
DATA
OE (3)
nCS (3)
nINIT_CONF (2)
Notes to Figure 13–14:
(1) The pull-up resistor should be connected to the same supply voltage as the configuration device.
(2) The nINIT_CONF pin is available on enhanced configuration devices and has an internal pull-up resistor that is
always active, meaning an external pull-up resistor should not be used on the nINIT_CONF to nCONFIG line. The
nINIT_CONF pin does not need to be connected if its functionality is not used. If nINIT_CONF is not used, nCONFIG
must be pulled to V_CC either directly or through a resistor (if reconfiguration is required, a resistor is necessary).
(3) The enhanced configuration devices’ OE and nCS pins have internal programmable pull-up resistors. If internal
pull-up resistors are used, external pull-up resistors should not be used on these pins. The internal pull-up resistors
are used by default in the Quartus II software. To turn off the internal pull-up resistors, check the Disable nCS and
OE pull-ups on configuration device option when generating programming files.
(4) Connect the pull-up resistor to the V_CCIO supply voltage of I/O bank that the nCEO pin resides in.
(5) The nCEO pin can be left unconnected or used as a user I/O pin when it does not feed other device’s nCE pin.
f
1 You cannot cascade enhanced configuration devices (EPC16,
EPC8, and EPC4 devices).
When configuring multiple devices, you must generate the configuration
device's POF from each project's SOF. You can combine multiple SOFs
using the Convert Programming Files window in the Quartus II
software.
For more information on how to create configuration files for multiple
device configuration chains, see the Software Settings section in Volume 2
of the Configuration Handbook.
When configuring multiple devices with the PS scheme, connect the first
Cyclone II device’s nCE pin to GND and connect its nCEO pin to the nCE
pin of the Cyclone II device in the chain. Use an external 10-kΩ pull-up
resistor to pull the Cyclone II device’s nCEO pin to the V_CCIO level when
13–38
Cyclone II Device Handbook, Volume 1
Altera Corporation
February 2007