Altera Nios Development Board Manuel d'utilisateur télécharger pdf (Page 23)

Altera Corporation 2–15

July 2005 Nios Development Board Reference Manual, Stratix II Edition

Board Components

Figure 2–5. Serial Connector J19

Figure 2–6. Serial Connector J27

Expansion

Prototype

Connectors

(PROTO1 &

PROTO2)

PROTO1 and PROTO2 are standard-footprint, mechanically-stable

connections that can be used (for example) as an interface to a special-

function daughter card. Headers J11, J12, and J13 collectively form

PROTO1, and J15, J16 and J17 collectively form PROTO2.

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 Stratix II device. Each signal passes through analog switches

to protect the Stratix II device from 5V logic levels. These analog

switches are permanently enabled. The output logic-level on the

expansion prototype connector pins is 3.3V.

● PROTO1 switches: U19, U20, U21, U22 and U25

● PROTO2 switches: U27, U28, U29, U30 and U31

■ A buffered, zero-skew copy of the on-board oscillator output from

U2.

■ A buffered, zero-skew copy of the Stratix II phase-locked loop (PLL)

output from U60.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 55 56

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Altera Nios Development Board Manuel d'utilisateur Page 23