EP2S180 Datasheet, PDF (18/58 Pages) Altera Corporation – DSP Development Board

Functional Description
Table 2–4. Clock Distribution Signals (Part 2 of 2)
Signal Name
Comes From
Goes To
pld_CLKIN0,pld_CLK 100-MHz oscillator
IN1
Stratix II device pins AM17
and A16
pld_CLKIN0_n,pld_C External CLKIN_n input Stratix II device pins AL17
LKIN1_n
(J11)
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 Stratix II device pin U1
the Stratix II pin J14
adc_CLK_IN1_n,
adc_CLK_IN2_n
External CLKIN_n input ADC A (U1 pins 8, 7) and B
(J11)
(U2 pins 8, 7) (1)
dac_DACCLKIN1,
dac_DACCLKIN2
External DA_EXT_CLK DAC A (U14 pin 28) and B
input (J12)
(U15 pin 28) (2)
pld_DACCLKIN
External DA_EXT_CLK Stratix II device pin E16
input (J12)
proto1_CLKOUT,
proto2_CLKOUT
PROTO1 (J25 pin 13) Stratix II device pins T32 and
PROTO2 (J28 pin 13) via T30
a buffer (U7)
Notes to Table 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.
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.
2–10
Core Version a.b.c variable
Stratix II EP2S180 DSP Development Board Reference Manual
Altera Corporation