PS Configuration
Figure 13–14. Multiple Device PS Configuration Using an Enhanced Configuration Device
V
(4)
V
(1)
V
(1)
CC
CC
CC
10 kΩ
10 kΩ
10 kΩ
(3)
(3)
Enhanced
Configuration
Device
V
V
CC
CC
Cyclone II Device 2
DCLK
Cyclone II Device 1
DCLK
DATA0
nSTATUS
DCLK
DATA
MSEL0
MSEL1
MSEL0
DATA0
(3)
MSEL1
OE
nSTATUS
CONF_DONE
nCONFIG
(3)
CONF_DONE
nCONFIG
nCS
nINIT_CONF(2)
GND
GND
N.C.
nCE
nCEO
(5)
nCEO
nCE
GND
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_CONFpin 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_CONFto nCONFIGline. The
nINIT_CONFpin does not need to be connected if its functionality is not used. If nINIT_CONFis not used, nCONFIG
must be pulled to VCC either directly or through a resistor (if reconfiguration is required, a resistor is necessary).
(3) The enhanced configuration devices’ OEand nCSpins 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 VCCIO supply voltage of I/O bank that the nCEOpin resides in.
(5) The nCEOpin can be left unconnected or used as a user I/O pin when it does not feed other device’s nCEpin.
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.
f
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 nCEpin to GND and connect its nCEOpin to the nCE
pin of the Cyclone II device in the chain. Use an external 10-kΩpull-up
resistor to pull the Cyclone II device’s nCEOpin to the VCCIO level when
13–38
Cyclone II Device Handbook, Volume 1
Altera Corporation
February 2007
ALTERA [ ALTERA CORPORATION ]
