Active Serial FPGA Configuration
f
f
For more information on configuring Cyclone II FPGAs in AS mode or
other configuration modes, see Chapter 4, Configuring Cyclone II
Devices in the Configuration Handbook, Volume 1.
For more information on configuring Cyclone FPGAs in AS mode or
other configuration modes, see Chapter 5, Configuring Cyclone FPGAs
in the Configuration Handbook, Volume 1.
Multiple devices can be configured by a single EPCS device. However,
serial configuration devices cannot be cascaded. Check Table 4–1 to
ensure the programming file size of the cascaded FPGAs does not exceed
the capacity of a serial configuration device. Figure 4–4 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.
Figure 4–4. Multiple Devices in AS Mode
V
(1)
V
(1)
V
CC
(1)
CC
CC
10 kΩ
10 kΩ
10 kΩ
Stratix II or Cyclone Series FPGA (Master)
FPGA (Slave)
CONF_DONE
CONF_DONE
nSTATUS
nSTATUS
nCONFIG
Serial
Configuration
Device (2)
nCONFIG
N.C.
nCEO
nCE
nCEO
nCE
n
n
MSEL[n]
MSEL[n]
(3)
(4)
DATA
DCLK
nCS
DATA0
DCLK
nCSO
ASDO
DATA0
DCLK
ASDI
Notes to Figure 4–4:
(1) VCC = 3.3-V.
(2) Serial configuration devices cannot be cascaded.
(3) 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.
(4) 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
Core Version a.b.c variable
Altera Corporation
July 2004
Configuration Handbook, Volume 2
ALTERA [ ALTERA CORPORATION ]
