Achronix Speedster22i SerDes Manual de usuario Pagina 105
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Transmitter
Table 23: DC and AC Switching Characteristics
Parameter
Description
Min
Typical
Max
Unit
Output Eye Specification
VTX-DIFF-PKPK Backporch Transmit Amplitude 400 1500
mV
diff-
pkpk
VTX-EYE-PKPK Transmit Eye Voltage Opening 400 1200
mV
diff-
pkpk
D
TX-N+1-DEEMP
N+1 precursor Tap De-Emphasis
0
2.5
dB
D
TX-N-1-DEEMP
N-1 postcursor Tap De-Emphasis
0
8.5
dB
D
TX-N-2-DEEMP
N-2 postcursor Tap De-Emphasis
0
2.5
dB
T
TX-SLEW
Rise/Fall Time
30
120
ps
TTX-DDJ
Transmit Dependant Jitter (Inter-
Symbol Interference) at 8Gbps.
Includes package model
0.05 UIpkpk
TTX-PJ
Transmit Periodic Jitter. Assumes a
1st order high pass jitter
measurement filter with a cutoff of
F
BAUD
/ F
GPLL =
N
GPLL
0.05 UIpkpk
TTX-RJ
Transmit Total Peak-Peak Random
Jitter (assumes 14σTXRJ-RMS). Assumes
a 1st order high pass jitter
measurement filter with a cutoff of
F
BAUD/ FGPLL = NGPLL
0.15 UIpkpk
TTX-TJ
Transmit Total Peak-Peak Jitter
(Assumes TTX-TJ = TTX-DDJ + TTX-PJ + TTX-
RJ). Assumes a 1st order high pass
jitter measurement filter with a cutoff
of F
BAUD
/ F
GPLL =
N
GPLL
0.25 UIpkpk
NGPLL
F3dB cutoff frequency for the 1
st
Order High-Pass Jitter Measurement
Filter.
Defined as the ratio of the F3DB cutoff
frequency, to the data rate
1667
F
BAUD/
F
GPLL
VTX-CM-PKPK-AC
Pk-PK AC Common Mode Voltage
Variation
100 mV
VTX-CM-RMS-AC
RMS AC Common Mode Voltage
Variation
20 mV
Transmitter DC Impedance
ZTX-DIFF-DC
Transmitter Output Differential DC
Impedance
80 100 120
Ω
ZTX-CM-DC
Transmitter Output Common-Mode
DC Impedance
20 25 30
Ω
UG028, July 1, 2014
105
- Speedster22i SerDes 1
- User Guide 1
- Table of Contents 2
- 4 UG028, July 1, 2014 4
- List of Figures 5
- List of Tables 6
- Overview 7
- Major standards supported 9
- 10 UG028, July 1, 2014 10
- SerDes Placement 11
- SerDes Architecture Overview 12
- 1. Common 13
- 3. Digital PMA (DPMA) 14
- PCS Self Test Logic 16
- 18 UG028, July 1, 2014 18
- Interface Encapsulation 20
- 8b/10b Encoder 20
- Running Disparity 20
- 22 UG028, July 1, 2014 22
- Polarity Bit Reversal (PBR) 23
- Symbol Alignment 23
- Modes of Operation 24
- Manual Mode: 24
- Bit Slip Mode: 24
- Automatic Mode: 24
- Deskew FIFO 25
- Functional Description 26
- Auto Mode: 26
- Symbol slip mode: 27
- 28 UG028, July 1, 2014 28
- EFIFO Operation 29
- 30 UG028, July 1, 2014 30
- 8b/10b Decoder 31
- Bit Slider 31
- PCS Self Test Checker 32
- PCS Interface 33
- PIPE Interface 34
- Clocking 36
- Debug and Test 38
- PMA loopback modes: 39
- PCS loopback modes: 39
- PMA Test Pattern Generator 40
- PMA Test Pattern Checker 40
- PCS Test Pattern Generator 40
- PRBS Generator 40
- PCS Test Pattern Checker 41
- Latency 42
- 44 UG028, July 1, 2014 44
- Configurations Supported 45
- 46 UG028, July 1, 2014 46
- 48 UG028, July 1, 2014 48
- Single-Lane Serdes Wrapper 50
- 52 UG028, July 1, 2014 52
- Overview Section: 53
- Entry field 54
- Purpose 54
- Available Options 54
- Choice made 54
- 56 UG028, July 1, 2014 56
- Section on PMA Settings: 57
- 58 UG028, July 1, 2014 58
- RX PMA Equalization 59
- RX PMA PLL 60
- TX PMA Driver 62
- TX PMA PLL 62
- Section on PCS Settings: 63
- RX PCS Settings 64
- RX PCS Symbol Alignment 66
- TX PCS Settings 68
- 70 UG028, July 1, 2014 70
- Files Generated by ACE-GUI 71
- Design and Wrapper Files 72
- Sequence 74
- 76 UG028, July 1, 2014 76
- Placement of SerDes 77
- Timing Constraints 78
- Design Guidelines 80
- Figure 37: Clock Region View 82
- 84 UG028, July 1, 2014 84
- Wide Bus 86
- Design Tips 87
- 88 UG028, July 1, 2014 88
- 90 UG028, July 1, 2014 90
- 92 UG028, July 1, 2014 92
- Design Bypassing PCS: 93
- Modification – 1 (ACE GUI): 94
- 96 UG028, July 1, 2014 96
- ACX_SERDES_SBUS_IF Module 99
- General signals: 100
- SerDes signals: 100
- Parallel Interface signals: 100
- UG028, July 1, 2014 101
- Pass-through signals: 102
- Loopback Modes 102
- SerDes signals 102
- Control signals 102
- SerDes Registers 103
- Electrical Specifications 104
- Transmitter 105
- 106 UG028, July 1, 2014 106
- Receiver 108
- Eye Diagram 110
- Reference Clock 112
- Revision History 113
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