3–6
Chapter 3: Serial Configuration Devices (EPCS1, EPCS4, EPCS16, EPCS64, and EPCS128) Data Sheet
Active Serial FPGA Configuration
Multiple devices can be configured by a single EPCS device. However, serial
configuration devices cannot be cascaded. Refer to
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 FPGA 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 3–4.
Multiple Devices in AS Mode
V
CC
(1)
10 k
V
CC
(1)
10 k
V
CC
(1)
10 k
Altera FPGA (Master)
CONF_DONE
nSTATUS
Serial
Configuration
Device
(2)
nCONFIG
Altera FPGA (Slave)
CONF_DONE
nSTATUS
nCONFIG
nCE
nCEO
MSEL[]
nCE
nCEO
MSEL[ ]
N.C.
(3)
DATA0
DCLK
(4)
DATA
DCLK
nCS
ASDI
DATA0
DCLK
nCSO
ASDO
Notes to
(1) For the V
CC
value, refer to the respective FPGA family handbook Configuration chapter.
(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
(4) Connect the FPGA
MSEL[]
input pins to select the PS configuration mode. For details, refer to the appropriate FPGA family chapter in the
(5) For more information about configuration pin I/O requirements in an AS scheme for an Altera FPGA, refer to the respective FPGA family handbook
Configuration chapter.
ALTERA [ ALTERA CORPORATION ]
