EP2S180F1020C4 Datasheet, PDF (673/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Remote System Upgrades with Stratix II and Stratix II GX Devices
When the remote system upgrade circuitry detects an external
configuration reset (nCONFIG pulsed low) or internal configuration reset
(logic array nCONFIG assertion), the device attempts to reload the
application configuration from page one.
Figure 8–5 shows the transitions between configurations in local update
mode.
Figure 8–5. Transitions Between Configurations in Local Update Mode
Power Up or nCONFIG assertion
Core or External
nCONFIG Assertion
Application
Configuration
(Page 001)
Configuration
Error
Core or External
nCONFIG Assertion
Configuration
Error
Factory
Configuration
(Page 000)
Stratix II and Stratix II GX FPGAs support local update mode in the FPP,
PS, and PPA configuration schemes. In these schemes, the MAX II device,
microprocessor, or enhanced configuration device should sample the
PGM[2..0] outputs from the Stratix II or Stratix II GX FPGA and
transmit the appropriate configuration image.
Local update mode is not supported with the AS configuration scheme,
(or serial configuration device), because the Stratix II or Stratix II GX
FPGA cannot determine the start address of the application configuration
page upon power up. While the factory configuration is always located at
memory address 0x000000, the application configuration can be located
at any other sector boundary within the serial configuration device. The
start address depends on the size of the factory configuration and is user
selectable. Hence, only remote update mode is supported in the AS
configuration scheme.
Altera Corporation
January 2008
8–13
Stratix II Device Handbook, Volume 2