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1–12 Altera Corporation

Nios Development Board Reference Manual, Cyclone Edition December 2004

Expansion Prototype Connector (PROTO1)

The expansion prototype connector interface includes:

■ 41 I/O pins for prototyping. All 41 I/O pins connect to user I/O pins

on the Cyclone device. Each signal passes through analog switches

(U19, U20, U21, U22 and U25) to protect the Cyclone device from 5-

V logic levels. These analog switches are permanently enabled.

■ A buffered, zero-skew copy of the on-board OSC output from U2.

■ A buffered, zero-skew copy of the Cyclone'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

PROTO1 & PROTO2)

■ One regulated 5-V power-supply pin (1A total max load for both

PROTO1 & PROTO2)

■ Numerous ground connections

The output logic-level on the expansion prototype connector pins is 3.3V.

The power supply included wit the Nios II development kit cannot

supply the maximum load current specified above.

Figure 1–5, Figure 1–6, and Figure 1–7 show connections from the

PROTO1 expansion headers to the Cyclone device. Unless otherwise

noted, labels indicate Cyclone device pin numbers.

Figure 1–5. Expansion Prototype Connector - J11

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 53 54

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Altera Nios Development Board Manuel d'utilisateur Page 20