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EPCS4SI8N数据手册
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Page 6 Active Serial FPGA Configuration
Serial Configuration (EPCS) Devices Datasheet April 2014 Altera Corporation
You can configure multiple devices with a single EPCS device. However, you cannot
cascade EPCS devices. To ensure that the programming file size of the cascaded
FPGAs does not exceed the capacity of an EPCS device, refer to Tab le 1 on page 1.
Figure 4 shows the AS configuration scheme with multiple FPGAs in the chain. The
f
irst FPGA is the configuration master and its
MSEL[]
pins are set to AS mode. The
following FPGAs are configuration slave devices and their
MSEL[]
pins are set to PS
mode.
Figure 4. Multiple Devices in AS Mode
(1),
(5)
DATA
DCLK
nCS
ASDI
DATA0
DCLK
nCSO
nCE
nCONFIG
nSTATUS
MSEL[ ]
nCEO
CONF_DONE
ASDO
V
CC
(1)
10 kΩ
V
CC
(1)
10 kΩ
V
CC
(1)
10 kΩ
(3)
Altera FPGA (Master)
DATA0
DCLK
nCE
nCONFIG
nSTATUS
MSEL[ ]
nCEO
CONF_DONE
(4)
Altera FPGA (Slave)
EPCS Device (2)
N.C.
Notes to Figure 4:
(1) For more information about the V
CC
value, refer to the configuration chapter in the appropriate device handbook.
(2) EPCS devices cannot be cascaded.
(3) Connect the
MSEL[]
input pins to select the AS configuration mode. For more information, refer to the configuration chapter in the appropriate
device handbook.
(4) Connect the
MSEL[]
input pins to select the PS configuration mode. For more information, refer to the configuration chapter in the appropriate
device handbook.
(5) For more information about configuration pin I/O requirements in an AS configuration scheme for an Altera FPGA, refer to the c
onfiguration
chapter in the appropriate device handbook.
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