EP2C20F256C8N Datasheet, PDF (370/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Active Serial Configuration (Serial Configuration Devices)
Figure 13–5. Multiple Device AS Configuration When FPGAs Receive the Same Data with Multiple SOFs
V_CC (1) V_CC (1) V_CC (1) V_CC (3)
Cyclone II Device Slave
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
N.C. (4)
10 k9 10 k9 10 k9 10 k9
DATA0
DCLK
V_CC
MSEL0
MSEL1
Serial
Configuration
Device
Data
DCLK
nCS
ASDI
Cyclone II Device Master
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
DATA0
DCLK
nCSO
ASDO
V_CC
MSEL0
MSEL1
Cyclone II Device Slave
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
N.C. (4)
DATA0
DCLK
V_CC
MSEL0
MSEL1
Cyclone II Device Slave
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
N.C. (4)
DATA0
DCLK
V_CC
MSEL0
MSEL1
Notes to Figure 13–5:
(1) Connect the pull-up resistors to a 3.3-V supply.
(2) Connect the pull-up resistor to the V_CCIO supply voltage of I/O bank that the nCEO pin resides in.
(3) 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.
13–16
Cyclone II Device Handbook, Volume 1
Altera Corporation
February 2007