EP2S180 ALTERA [Altera Corporation], EP2S180 Datasheet - Page 57

• Manufacturer Part Number: EP2S180
• Description: DSP Development Board
• Manufacturer: ALTERA [Altera Corporation]

Altera Corporation
Expansion Prototype Connector (J26, J27, J28)
Headers J26, J27, and J28 collectively form a standard-footprint,
mechanically-stable connection that can be used (for example) as an
interface to a special-function daughter card.
The expansion prototype connector interface includes:
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Figures 2–12
the Stratix II device. Unless otherwise noted, the labels indicate Stratix II
device pin numbers.
Figure 2–12. Expansion Prototype Connector - J26, J27, J28
41 I/O pins for prototyping. All 41 I/O pins connect to user I/O pins
on the Stratix II device. Each signal passes through analog switches
(U27, U28, U29, U30 and U31) to protect the Stratix II device from 5-V
logic levels. These analog switches are permanently enabled. The
output logic-level on the expansion prototype connector pins is
3.3 V.
A buffered, zero-skew copy of the on-board OSC output (from U2).
A buffered, zero-skew copy of the Stratix II device’s phase-locked
loop (PLL)-output (from U60).
A logic-negative, power-on reset signal.
Five regulated 3.3-V power-supply pins (2A total max load for both
expansion prototype connectors).
One regulated 5-V power-supply pin (1A total max load for both
expansion prototype connectors).
Numerous ground connections.
and
Stratix II EP2S180 DSP Development Board Reference Manual
2–13
Pin 1
show connections from the expansion prototype to
Pin 1
J27
Core Version a.b.c variable
J26
Board Components & Interfaces
Pin 1
J28
2–49