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VCU110 Evaluation Board
42
UG1073 (v1.2) March 26, 2016
Chapter 1:
VCU110 Evaluation Board Features
Jitter-Attenuating Clock Multipliers
[
, callout 12, 13 and 14]
The VCU110 board hosts three Silicon Labs SI5328C jitter-attenuating clock multipliers
(U57, U181, and U179) on the back of the board.
The SI5328C U57 HMC clock multiplier is used to generate the multiple clock frequencies
required to drive the U160 HMC device and FPGA MGTH interface.
The U57 jitter attenuated clock multiplier circuit is shown in
The VCU110 board second Silicon Labs SI5328C jitter attenuator U179 is on the back side of
the board. FPGA U1 user logic can implement a clock recovery circuit and then output this
clock to a differential I/O pair on I/O bank 128 (CFP4_REC_CLOCK2_C_P, U1 pin V34 and
CFP4_REC_CLOCK2_C_N, U1 pin V35) for jitter attenuation. The jitter attenuated clock
(CFP4_SI5328_OUT1_P (U179 pin 28) and CFP4_SI5328_OUT1_N (U179 pin 29)) are then
routed as a reference clock to GTY Quads 125, 127, 128 and 131 REFCLK0 clock inputs as
detailed in the
The primary purpose of this clock is to support CPRI/OBSAI applications that perform clock
recovery from a user-supplied CFP4 module and use the jitter attenuated recovered clock to
drive the reference clock inputs of a GTY transceiver.
X-Ref Target - Figure 1-10
Figure 1-10:
HMC Jitter-Attenuating Clock Multiplier
GND
GND
GND
GND
GND
HMC_SI5328_VCC
L31
FERRITE-220
2
1
25V
0.1UF
C23
2
1
C24
0.1UF
25V
2
1
C294
1UF
25V
2
1
HMC_SI5328_VCC
C26
0.1UF
25V
2
1
25V
0.1UF
C27
2
1
SI5328_INT_ALM
HMC_SI5328_XTAL_XA
HMC_SI5328_OUT1_C_P
HMC_SI5328_OUT1_C_N
SI5328_RST
HMC_SI5328_XTAL_XB
HMC_SI5328_SCL
HMC_SI5328_SDA
X5
3
1
4
2
XA
XB
GND1
GND2
114.285MHZ
20PPM
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
U57
29
28
27
24
20
19
17
16
15
13
12
11
10
9
7
6
5
4
3
2
1
32
23
22
33
30
14
18
37
31
8
21
36
35
34
26
25
A1
A2_SS
CKOUT2_N
CKOUT2_P
CMODE
CS_CA
GND1
GND2
GNDP
AD
LOL
NC3
NC4
NC5
SCL
SDA_SDO
VDD3
RST_B
NC1
INT_C1B
C2B
VDD1
XA
XB
NC2
VDD2
RATE0
CKIN2_P
CKIN2_N
RATE1
CKIN1_P
CKIN1_N
NC6
NC7
A0
SDI
CKOUT1_P
CKOUT1_N
QFN36_6X6MM
SI5328C-C-GM
NC
NC
UTIL_3V3
25V
0.1UF
C1363
2
1
C1364
0.1UF
25V
2
1
HMC_SI5328_OUT2_BUF2_C_N
HMC_SI5328_OUT2_BUF2_C_P
1%
4.70K
R21
1
2
HMC_SI5328_OUT2_P
HMC_SI5328_OUT2_BUF2_N
HMC_SI5328_OUT2_N
HMC_SI5328_OUT2_BUF2_P
GND
GND
Q0_P
Q0_N
CLK0_P
CLK0_N
CLK_SEL
GNDP
AD
GND
VDD
VREF
CLK1_P
CLK1_N
Q1_P
Q1_N
Q2_P
Q2_N
Q3_P
Q3_N
GND
2
1
1%
100
R1230
1
2
1UF
C1626
25V
NC
9
10
6
7
2
17
1
5
8
3
4
11
12
13
14
15
16
SI53340-B-GM
QFN16_SI_3X3MM
U165
UTIL_3V3
NC
NC
2
1
1%
4.70K
R1193
NC
NC
NC
NC
HMC_SI5328_OUT2_BUF1_N
1
C1560
2
0.1UF
25V
2
25V
0.1UF
C1561
1
HMC_SI5328_OUT2_BUF1_C_N
HMC_SI5328_OUT2_BUF1_C_P
HMC_SI5328_OUT2_BUF1_P
NC
NC
1/10W
X5R
1/16W
1/16W
X5R
HMC_SI5328_OUT1_P
HMC_SI5328_OUT1_N
X6S
C500
10UF
6.3V
2
1
HMC_SI5328_VCC
;