EP2S180F1020C4 Datasheet, PDF (616/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Passive Serial Configuration
configuration at the same time. Figure 7–24 shows multi-device PS
configuration when the Stratix II or Stratix II GX devices are receiving the
same configuration data.
Figure 7–24. Multiple-Device PS Configuration Using an Enhanced Configuration Device When devices
Receive the Same Data
(1) V_CC
V_CC (1)
Stratix II or Stratix II GX
Device 1
10 KΩ
(4) N.C.
VCC
nCEO
MSEL3
MSEL2
MSEL1
DCLK
DATA0
nSTATUS
CONF_DONE
nCONFIG
MSEL0
nCE
(3) (3)
10 KΩ
Enhanced
Configuration
Device
DCLK
DATA0
OE (3)
nCS (3)
nINIT_CONF (2)
GND
(4) N.C.
VCC
Stratix II or Stratix II GX GND
Device 2
nCEO
DCLK
MSEL3
DATA0
nSTATUS
MSEL2 CONF_DONE
MSEL1
nCONFIG
MSEL0
nCE
GND
GND
Last Stratix II or Stratix II GX
Device
(4) N.C.
VCC
nCEO
MSEL3
MSEL2
DCLK
DATA0
nSTATUS
CONF_DONE
MSEL1
nCONFIG
MSEL0
nCE
GND
GND
Notes to Figure 7–24:
(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-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 all devices are left unconnected when configuring the same configuration data into multiple
devices.
7–64
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008