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2–10 Core Version a.b.c variable Altera Corporation

Stratix II EP2S180 DSP Development Board Reference Manual

Functional Description

The Stratix II EP2S180 DSP development board can obtain a clock source

from one or more of the following sources:

■ The on-board crystal oscillator

■ An external clock (through an SMA connector or a Stratix II pin)

The board can provide independent clocks from both the enhanced and

fast PLLs to the A/D converters, the D/A converters, and the other

components that require stable clock sources.

To implement this concept, the enhanced PLL5-dedicated pins drive the

A/D converters and associated functions, and the enhanced

PLL6-dedicated pins drive the D/A converters and associated functions.

pld_CLKIN0,pld_CLK

IN1

100-MHz oscillator Stratix II device pins AM17

and A16

pld_CLKIN0_n,pld_C

LKIN1_n

External CLKIN_n input

(J11)

Stratix II device pins AL17

and B16

proto1_OSC,

proto2_OSC

100-MHz oscillator PROTO1 (J25 pin 9) and

PROTO2 (J28 pin 9) via a

buffer (U7)

cpld_CLKOSC 100-MHz oscillator CPLD (U10 pin 125)

adc_CLK_IN1,

adc_CLK_IN2

100-MHz oscillator ADC A (U1 pins 8, 7) and B

(U2 pins 8, 7) (1)

dac_CLKIN1,

dac_CLKIN2

100-MHz oscillator DAC A (U14 pin 28) and B

(U15 pin 28) (2)

pld_CLKFB pld_CLKOUT signal from

the Stratix II pin J14

Stratix II device pin U1

adc_CLK_IN1_n,

adc_CLK_IN2_n

External CLKIN_n input

(J11)

ADC A (U1 pins 8, 7) and B

(U2 pins 8, 7) (1)

dac_DACCLKIN1,

dac_DACCLKIN2

External DA_EXT_CLK

input (J12)

DAC A (U14 pin 28) and B

(U15 pin 28) (2)

pld_DACCLKIN External DA_EXT_CLK

input (J12)

Stratix II device pin E16

proto1_CLKOUT,

proto2_CLKOUT

PROTO1 (J25 pin 13)

PROTO2 (J28 pin 13) via

a buffer (U7)

Stratix II device pins T32 and

T30

Notes to Ta b le 2 – 4:

(1) J3 and J4 control which clock is routed to the A/D converters. See Table 2–10 for

details.

(2) J18 and J19 control which clock is routed to the D/A converters. See Table 2–16

for details.

Table 2–4. Clock Distribution Signals (Part 2 of 2)

Signal Name Comes From Goes To

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 57 58

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