HC1S40 datasheet(13/110 Pages) ALTERA

13 / 110 page

Altera Corporation

2–7

September 2008

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 VCC.

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.

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.

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

device, the I/O pins

U12 and U18 must

be connected to ground.

In the EP1S40 780-pin FineLine BGA

device, the I/O pins

U12 and U18 are

available as general-purpose I/O pins.

HC1S40 Datasheet(PDF) 13 Page - Altera Corporation

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