Configuring Cyclone II Devices
Figure 13–20. Multiple Device PS Configuration Using a USB-Blaster, MasterBlaster, ByteBlaster II or
ByteBlasterMV Cable
V
(1)
CC
10 kΩ
(2)
USB-Blaster, ByteBlaster II,
MasterBlaster, or ByteBlasterMV
10-Pin Male Header
V
(1)
CC
V
(1)
V
(1)
CC
10 kΩ
CC
10 kΩ
(Passive Serial Mode)
10 kΩ
(2)
V
Cyclone II FPGA 1
CC
Pin 1
CONF_DONE
nSTATUS
MSEL0
DCLK
V
(2)
CC
V
(4)
CC
10 kΩ
MSEL1
GND
VIO (3)
V
(1)
CC
nCE
10 kΩ
GND
V
DATA0
nCEO
nCONFIG
GND
CC
Cyclone II FPGA 2
CONF_DONE
MSEL0
MSEL1
nSTATUS
DCLK
nCEO
N.C. (5)
GND
nCE
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 (VIOpin),
ByteBlaster II, or ByteBlasterMV cable.
(2) The pull-up resistors on DATA0and DCLKare only needed if the download cable is the only configuration scheme
used on your board. This is to ensure that DATA0and DCLKare not left floating after configuration. For example, if
you are also using a configuration device, the pull-up resistors on DATA0and DCLKare not needed.
(3) Pin 6 of the header is a VIO reference voltage for the MasterBlaster output driver. VIO should match the device's
VCCIO. 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 nCEwhen it
is used for AS programming, otherwise it is a no connect.
(4) Connect the pull-up resistor to the VCCIO supply voltage of I/O bank that the nCEOpin resides in.
(5) The nCEOpin 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
nSTATUSand CONF_DONEsignals. Additionally, you can add switches to
Altera Corporation
February 2007
13–51
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
