EP2S90F1020C5 Datasheet, PDF (642/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

JTAG Configuration
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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 will drive nCE of the next device low when it has
successfully been JTAG configured.
Other Altera devices that have JTAG support can be placed in the same
JTAG chain for device programming and configuration.
1 Stratix, Stratix II, Stratix II GX, Cyclone^™, and Cyclone II
devices must be within the first 17 devices in a JTAG chain. All
of these devices have the same JTAG controller. If any of the
Stratix, Stratix II, Stratix II GX, Cyclone, and Cyclone II devices
are in the 18th or after they will fail configuration. This does not
affect SignalTap^® II.
For more information on configuring multiple Altera devices in the same
configuration chain, refer to the Configuring Mixed Altera FPGA Chains
chapter in the Configuration Handbook.
7–90
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008