EP2C20F256C8N Datasheet, PDF (413/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Configuring Cyclone II Devices
Figure 13–24. JTAG Configuration of Multiple Devices Using a Download Cable
USB-Blaster, ByteBlaster II,
MasterBlaster,
or ByteBlasterMV
10-Pin Male Header
VCC (1)
VCC (1) VCC (1)
VCC (1) VCC (1)
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
Cyclone II FPGA
Cyclone II FPGA
Cyclone II FPGA
VCC (1)
10 kΩ
Pin 1
VCC
1 kΩ ⁽²⁾
VCC
(2)
VCC ₍₂₎
(2)
1 kΩ
(2)
nSTATUS
DATA0
DCLK
nCONFIG
MSEL1 _{CONF_DONE}
MSEL0
nCEO
nCE (4)
nSTATUS
(2) _DATA0
(2) _DCLK
(2) _nCONFIG
(2)
(2)
MSEL1 _{CONF_DONE}
MSEL0
nCEO
nCE (4)
nSTATUS
(2) _DATA0
(2) _DCLK
(2) _nCONFIG
(2)
(2)
MSEL1 _{CONF_DONE}
MSEL0
nCEO
nCE (4)
VIO
(3)
TDI
TDO
TMS TCK
TDI
TDO
TMS TCK
TDI
TDO
TMS TCK
1 kΩ
Notes to Figure 13–24:
(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) Connect the nCONFIG and MSEL[1..0] pins to support a non-JTAG configuration scheme. If only JTAG
configuration is used, connect the nCONFIG pin to V_CC, and the MSEL[1..0] pins to ground. In addition, pull DCLK
and DATA0 to either high or low, whichever is convenient on your board.
(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
cable, this pin is a no connect. In the USB-Blaster and ByteBlaster II cable, this pin is connected to nCE when it is
used for AS programming, otherwise it is a no connect.
(4) nCE must be connected to ground or driven low for successful JTAG configuration.
Connect the nCE pin to GND or pull it low during JTAG configuration. In
multiple device AS and PS configuration chains, connect the first device's
nCE pin to GND and connect its nCEO pin to the nCE pin of the next
device in the chain or you can use it as a user I/O pin after configuration.
After the first device completes configuration in a multiple device
configuration chain, its nCEO pin drives low to activate the second
device’s nCE pin, which prompts the second device to begin
configuration. Therefore, if these devices are also in a JTAG chain, you
should make sure the nCE pins are connected to GND during JTAG
configuration or that the devices are JTAG configured in the same order
as the configuration chain. As long as the devices are JTAG configured in
the same order as the multiple device configuration chain, the nCEO pin
of the previous device drives the nCE pin of the next device low when it
has successfully been JTAG configured.
Altera Corporation
February 2007
13–59
Cyclone II Device Handbook, Volume 1