EP2C8T144I8N Datasheet, PDF (405/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Configuring Cyclone II Devices
Figure 13–20. Multiple Device PS Configuration Using a USB-Blaster, MasterBlaster, ByteBlaster II or
ByteBlasterMV Cable
VCC (1)
10 kΩ
(2)
VCC
VCC (4)
VCC (1)
10 kΩ
10 kΩ
GND
VCC
VCC (1)
10 kΩ
VCC (1)
(2)
10 kΩ
VCC (1)
Cyclone II FPGA 1
10 kΩ
MSEL0
MSEL1
CONF_DONE
nSTATUS
DCLK
nCE
DATA0
nCONFIG
nCEO
Cyclone II FPGA 2
MSEL0
MSEL1
CONF_DONE
nSTATUS
DCLK
USB-Blaster, ByteBlaster II,
MasterBlaster, or ByteBlasterMV
10-Pin Male Header
(Passive Serial Mode)
Pin 1
VCC (2)
GND
VIO (3)
GND
GND
nCE
nCEO N.C. (5)
DATA0
nCONFIG
Notes to Figure 13–20:
(1) The pull-up resistor should be connected to the same supply voltage as the USB-Blaster, MasterBlaster (VIO pin),
ByteBlaster II, or ByteBlasterMV cable.
(2) The pull-up resistors on DATA0 and DCLK are only needed if the download cable is the only configuration scheme
used on your board. This is to ensure that DATA0 and DCLK are not left floating after configuration. For example, if
you are also using a configuration device, the pull-up resistors on DATA0 and DCLK are not needed.
(3) Pin 6 of the header is a V_IO reference voltage for the MasterBlaster output driver. V_IO should match the device's
V_CCIO. Refer to the MasterBlaster Serial/USB Communications Cable Data Sheet for this value. In the
ByteBlasterMV, this pin is a no connect. In the USB-Blaster and ByteBlaster II, this pin is connected to nCE when it
is used for AS programming, otherwise it is a no connect.
(4) Connect the pull-up resistor to the V_CCIO supply voltage of I/O bank that the nCEO pin resides in.
(5) The nCEO pin of the last device in chain can be left unconnected or used as a user I/O pin.
If you are using a download cable to configure Cyclone II devices on a
PCB that also has configuration devices, you should electrically isolate
the configuration devices from the target Cyclone II devices and cable.
One way to isolate the configuration device is to add logic, such as a
multiplexer, that can select between the configuration device and the
cable. The multiplexer should allow bidirectional transfers on the
nSTATUS and CONF_DONE signals. Additionally, you can add switches to
Altera Corporation
February 2007
13–51
Cyclone II Device Handbook, Volume 1