EP1S30F780C6 Datasheet, PDF (729/864 Pages) Altera Corporation – Stratix Device Handbook, Volume 1

Configuring Stratix & Stratix GX Devices
Figure 11–3. Multi-Device Configuration Circuit Note (1)
VCC (2) VCC (2) VCC (2)
10 kΩ 10 kΩ 10 kΩ
(3)
(4)
(3)
VCC
Stratix or Stratix GX Device 2
MSEL2
MSEL1
DCLK
DATA0
nSTATUS
MSEL0 CONF_DONE
nCONFIG
GND
N.C. nCEO
nCE
VCC ^{Stratix or Stratix GX Device 1}
MSEL2
DCLK
DATA0
MSEL1
nSTATUS
MSEL0 CONF_DONE
nCONFIG
GND
nCEO
nCE
GND
EPC1/EPC2
DCLK
DATA
OE (3)
nCS (3) nCASC
nINIT_CONF (4)
EPC1/EPC2
DCLK
DATA
nCS
OE
nINIT_CONF (4)
Notes to Figure 11–3:
(1) When performing multi-device active serial configuration, you must generate the configuration device programmer
object file (.pof) from each project’s SOF. You can combine multiple SOFs using the Quartus II software through the
Device & Pin Option dialog box. For more information on how to create configuration and programming files, see
the Software Settings section in the Configuration Handbook, Volume 2.
(2) The pull-up resistor should be connected to the same supply voltage as the configuration device.
(3) The enhanced configuration devices and EPC2 devices have internal programmable pull-ups on OE and nCS. You
should only use the internal pull-ups of the configuration device if the nSTATUS and CONF_DONE signals are pulled
up to 3.3 V or 2.5 V (not 1.8 V or 1.5 V). If external pull-ups are used, they should be 10 kΩ
(4) The nINIT_CONF pin is available on EPC16, EPC8, EPC4, and EPC2 devices. If nINIT_CONF is not used, nCONFIG
must be pulled to V_CC through a resistor. The nINIT_CONF pin has an internal pull-up resistor that is always active
in EPC16, EPC8, EPC4, and EPC2 devices. These devices do not need an external pull-up resistor on the
nINIT_CONF pin.
After the first Stratix or Stratix GX device completes configuration during
multi-device configuration, its nCEO pin activates the second device’s
nCE pin, prompting the second device to begin configuration. Because all
device CONF_DONE pins are tied together, all devices initialize and enter
user mode at the same time.
In addition, all nSTATUS pins are tied together; thus, if any device
(including the configuration devices) detects an error, configuration stops
for the entire chain. Also, if the first configuration device does not detect
CONF_DONE going high at the end of configuration, it resets the chain by
pulsing its OE pin low for a few microseconds. This low pulse drives the
OE pin low on the second configuration device and drives nSTATUS low
on all Stratix and Stratix GX devices, causing them to enter an error state.
If the Auto-Restart Configuration on Frame Error option is turned on in
the software, the Stratix or Stratix GX device releases its nSTATUS pins
after a reset time-out period. When the nSTATUS pins are released and
pulled high, the configuration devices reconfigure the chain. If the Auto-
Altera Corporation
July 2005
11–11
Stratix Device Handbook, Volume 2