Altera Stratix - Auto Placement & Verification of Selectable I;O Standards

Altera Corporation 4–41
June 2006 Stratix Device Handbook, Volume 2
Selectable I/O Standards in Stratix & Stratix GX Devices
Figure 4–24. Floorplan View Window
Auto Placement & Verification of Selectable I/O Standards
The Quartus II software automatically verifies the placement for all I/O
and V
REF
pins and performs the following actions.
■ Automatically places I/O pins of different V
REF
standards without
pin assignments in separate I/O banks and enables the V
REF
pins of
these I/O banks.
■ Verifies that voltage-referenced I/O pins requiring different V
REF
levels are not placed in the same bank.
■ Reports an error message if the current limit is exceeded for a Stratix
or Stratix GX power bank, as determined by the equation
documented in “DC Guidelines” on page 4–35.
■ Reserves the unused high-speed differential I/O channels and
regular user I/O pins in the high-speed differential I/O banks when
any of the high-speed differential I/O channels are being used.
■ Automatically assigns V
REF
pins and I/O pins such that the current
requirements are met and I/O standards are placed properly.