EP1S80F1020C6 Datasheet, PDF (469/864 Pages) Altera Corporation – Stratix Device Handbook, Volume 1

Figure 4–24. Floorplan View Window
Selectable I/O Standards in Stratix & Stratix GX Devices
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.
Altera Corporation
June 2006
4–41
Stratix Device Handbook, Volume 2