EP2S180F1020C4 Datasheet, PDF (585/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Configuring Stratix II and Stratix II GX Devices
Figure 7–10. Multiple-Device FPP Configuration Using an Enhanced Configuration Device When Both
devices Receive the Same Data
VCC (1)
VCC (1)
10 kΩ (3)
(3) 10 kΩ
Stratix II Device
MSEL[3..0]
GND
DCLK
DATA[7..0]
nSTATUS
CONF_DONE
nCONFIG
Stratix II Device
MSEL[3..0]
GND
DCLK
DATA[7..0]
nSTATUS
CONF_DONE
nCONFIG
(4) N.C. nCEO
nCE
GND
(4) N.C. nCEO
nCE
GND
Enhanced
Configuration Device
DCLK
DATA[7..0]
OE (3)
nCS (3)
nINIT_CONF (2)
Notes to Figure 7–10:
(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. This means an external pull-up resistor should not be used on the nINIT_CONF-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.
(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 pins of both devices are left unconnected when configuring the same configuration data into multiple
devices.
f
You can use a single enhanced configuration chain to configure multiple
Stratix II or Stratix II GX devices with other Altera devices that support
FPP configuration, such as Stratix and Stratix GX devices. To ensure that
all devices in the chain complete configuration at the same time or that an
error flagged by one device initiates reconfiguration in all devices, all of
the device CONF_DONE and nSTATUS pins must be tied together.
For more information on configuring multiple Altera devices in the same
configuration chain, refer to Configuring Mixed Altera FPGA Chains in the
Configuration Handbook.
Altera Corporation
January 2008
7–33
Stratix II Device Handbook, Volume 2