EP2C8T144I8N Datasheet, PDF (398/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

PS Configuration
Figure 13–16. Multiple Device PS Configuration Using an Enhanced Configuration Device When FPGAs
Receive the Same Data
(1) V_CC
VCC (1)
(4) N.C.
VCC
Cyclone II Device 1
nCEO
DCLK
DATA0
nSTATUS
CONF_DONE
nCONFIG
nCE
MSEL1
MSEL0
10 kΩ
(3) (3) 10 kΩ
GND
(4) N.C.
VCC
Cyclone II Device 2
nCEO
DCLK
DATA0
nSTATUS
CONF_DONE
nCONFIG
nCE
MSEL1
MSEL0
GND
GND
GND
Enhanced
Configuration
Device
DCLK
DATA0
OE (3)
nCS (3)
nINIT_CONF (2)
Cyclone II Device 8
(4) N.C. nCEO
DCLK
DATA0
nSTATUS
CONF_DONE
nCONFIG
VCC
MSEL1
nCE
MSEL0
GND
GND
Notes to Figure 13–16:
(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) 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.
You can cascade several EPC2 or EPC1 devices to configure multiple
Cyclone II devices. The first configuration device in the chain is the
master configuration device, and the subsequent devices are the slave
devices. The master configuration device sends DCLK to the Cyclone II
13–44
Cyclone II Device Handbook, Volume 1
Altera Corporation
February 2007