EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 313

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Altera Corporation-Preliminary
March 2007
f
input for the nCE pin comes from the previous device, while its nCEO pin
is left floating. In addition, the CONF_DONE and nSTATUS signals are all
shared in multi-device AS, AP, PS, and FPP configuration chains so the
devices can enter user mode at the same time after configuration is
complete. When the CONF_DONE and nSTATUS signals are shared among
all the devices, every device must be configured when JTAG
configuration is performed.
If you only use JTAG configuration, Altera recommends that you connect
the circuitry as shown in
nSTATUS signals are isolated so that each device can enter user mode
individually.
After the first device completes configuration in a multi-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, 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 multi-device configuration chain, the nCEO of the
previous device drives the nCE pin of the next device low when it has
successfully been JTAG configured.
You can place other Altera devices that have JTAG support in the same
JTAG chain for device programming and configuration.
1
For more information about configuring multiple Altera devices in the
same configuration chain, refer to the Configuring Mixed Altera Device
Chains chapter in the Configuration Handbook.
Figure 10–26
microprocessor.
JTAG configuration allows an unlimited number of Cyclone III
devices to be cascaded in a JTAG chain.
shows JTAG configuration of a Cyclone III device with a
Figure
10–25, where each of the CONF_DONE and
Cyclone III Device Handbook, Volume 1
JTAG Configuration
10–77