Active Serial FPGA Configuration
f
For more information on configuring Cyclone II FPGAs in AS mode or
other configuration modes, see
in the
For more information on configuring Cyclone FPGAs in AS mode or
other configuration modes, see Chapter 5, Configuring Cyclone FPGAs
in the
Multiple devices can be configured by a single EPCS device. However,
serial configuration devices cannot be cascaded. Check
to
ensure the programming file size of the cascaded FPGAs does not exceed
the capacity of a serial configuration device.
shows the AS
configuration scheme with multiple FPGAs in the chain. The first
Stratix II or Cyclone device is the configuration master and has its
MSEL[]
pins set to AS mode. The following FPGAs are configuration
slave devices and have their
MSEL[]
pins set to PS mode.
f
Figure 4–4. Multiple Devices in AS Mode
V
CC
(1)
10 kΩ
V
CC
(1)
10 kΩ
V
CC
(1)
10 kΩ
Stratix II or Cyclone Series FPGA (Master)
CONF_DONE
nSTATUS
Serial
Configuration
Device
(2)
nCONFIG
FPGA (Slave)
CONF_DONE
nSTATUS
nCONFIG
nCE
nCEO
MSEL[n]
n
(3)
nCE
nCEO
MSEL[n]
n
N.C.
(4)
DATA
DCLK
nCS
ASDI
DATA0
DCLK
nCSO
ASDO
DATA0
DCLK
Notes to
(1)
(2)
(3)
(4)
V
CC
= 3.3-V.
Serial configuration devices cannot be cascaded.
Connect the FPGA
MSEL[]
input pins to select the AS configuration mode. For details, refer to the appropriate
FPGA family chapter in the Configuration Handbook.
Connect the FPGA
MSEL[]
input pins to select the PS configuration mode. For details, refer to the appropriate
FPGA family chapter in the Configuration Handbook
4–8
Configuration Handbook, Volume 2
Core Version a.b.c variable
Altera Corporation
July 2004
ALTERA [ ALTERA CORPORATION ]
