EP2S180F1020C4 Datasheet, PDF (614/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Passive Serial Configuration
Figure 7–23. Concurrent PS Configuration of Multiple Devices Using an
Enhanced Configuration Device
(1) VCC
VCC (1)
Stratix II Device 1
10 kΩ (3) (3) 10 kΩ
N.C. nCEO
DCLK
MSEL3
DATA0
VCC
nSTATUS
MSEL2 _{CONF_DONE}
MSEL1
nCONFIG
MSEL0
nCE
GND
N.C.
VCC
Stratix II Device 2
nCEO
DCLK
MSEL3
DATA0
nSTATUS
MSEL2 CONF_DONE
MSEL1
nCONFIG
nCE
MSEL0
GND
Enhanced
Configuration
Device
DCLK
DATA0
DATA1
DATA[2..6]
OE (3)
nCS (3)
nINIT_CONF (2)
DATA 7
GND
GND
Stratix II Device 8
N.C. nCEO
DCLK
MSEL3
DATA0
VCC
nSTATUS
MSEL2 _{CONF_DONE}
MSEL1
nCONFIG
MSEL0
nCE
GND
GND
Notes to Figure 7–23:
(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.
7–62
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008