HC1S25 Datasheet, PDF (13/110 Pages) Altera Corporation – HardCopy Stratix Device Family

Description, Architecture, and Features
When designing with very tight timing constraints (for example, DDR or
quad data rate [QDR]), or if using the programmable drive strength
option, Altera recommends verifying final drive strength using updated
IBIS models located on the Altera website at www.altera.com.
Differential I/O standards are unaffected.
I/O pin placement and VREF pin placement rules are identical between
HardCopy Stratix and Stratix devices. Unused pin settings will carry over
from Stratix device settings and are implemented as tri-stated outputs
driving ground or outputs driving V_CC.
In Stratix EP1S40 780-pin FineLine BGA FPGAs, the I/O pins U12 and
U18 are available as general-purpose I/O pins. In the FPGA prototype,
EP1S40F780_HARDCOPY_FPGA_PROTOTYPE, and in the Hardcopy
Stratix HC1S40 780-pin FineLine BGA device, the I/O pins U12 and U18
must be connected to ground. HC1S40 780-pin FineLine BGA and
EP1S40F780_HARDCOPY_FPGA_PROTOTYPE pin-outs are identical.
Table 2–7 illustrates the differences between HardCopy Stratix and
Stratix I/O pins.
Table 2–7. HardCopy Stratix and Stratix I/O Pin Comparison
HardCopy Stratix
Stratix
The IOEs are equivalent, but not
identical to, the FPGA IOEs due to
slight design optimizations for
HardCopy devices.
IOEs are optimized for the FPGA
architecture.
The I/O drive strength for single-ended
I/O pins are slightly different and are
found in the HardCopy Stratix IBIS
models.
The I/O drive strength for single-ended
I/O pins are found in Stratix IBIS
models.
In the HC1S40 780-pin FineLine BGA In the EP1S40 780-pin FineLine BGA
device, the I/O pins U12 and U18 must device, the I/O pins U12 and U18 are
be connected to ground.
available as general-purpose I/O pins.
Power-Up
Modes in
HardCopy Stratix
Devices
Designers do not need to configure HardCopy Stratix devices, unlike
their FPGA counterparts. However, to facilitate seamless migration,
configuration can be emulated in HardCopy Stratix devices.
The modes in which a HardCopy Stratix device can be made ready for
operation after power-up are: instant on, instant on after 50 ms, and
configuration emulation. These modes are briefly described below.
Altera Corporation
2–7
September 2008