EP2C20F256C8N Datasheet, PDF (371/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Configuring Cyclone II Devices
Single SOF
The second method configures both the master and slave Cyclone II
devices with the same SOF. The serial configuration device stores one
copy of the SOF file. This setup is shown in Figure 13–6 where the master
is setup in AS mode, and the slave devices are setup in PS mode
(MSEL=01). You could setup one or more slave devices in the chain and
all the slave devices are setup in the same way as shown in Figure 13–6.
Figure 13–6. Multiple Device AS Configuration When FPGAs Receive the Same Data with a Single SOF
V_CC (1) V_CC (1) V_CC (1)
10 kΩ 10 kΩ 10 kΩ
Serial
Configuration
Device
Data
DCLK
nCS
ASDI
Cyclone II Device Master
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
N.C. (3)
DATA0
DCLK
nCSO
ASDO
V_CC
MSEL0
MSEL1
Cyclone II Device Slave 1
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
N.C. (3)
DATA0
DCLK
V_CC
MSEL0
MSEL1
Cyclone II Device Slave 2
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
N.C. (3)
DATA0
DCLK
V_CC
MSEL0
MSEL1
Buffers
Notes to Figure 13–6:
(1) Connect the pull-up resistors to a 3.3-V supply.
(2) The nCEO pin can be left unconnected or used as a user I/O pin when it does not feed another device’s nCE pin.
In this setup, all the Cyclone II devices in the chain are connected for
concurrent configuration. This can reduce the AS configuration time
because all the Cyclone II devices are configured in one configuration
cycle. Connect the nCE input pins of all the Cyclone II devices to ground.
You can either leave the nCEO output pins on all the Cyclone II devices
unconnected or use the nCEO output pins as normal user I/O pins. The
DATA and DCLK pins are connected in parallel to all the Cyclone II
devices.
Altera Corporation
February 2007
13–17
Cyclone II Device Handbook, Volume 1