Achronix Speedster22i SerDes Instrukcja Użytkownika Pobierz pdf (Strona 12)

SerDes Architecture Overview

The SerDes has an independent lane architecture. Each lane has a Physical Media Attachment

(PMA), Synthesizer (Transmit PLL), Clock and Data Recovery (CDR) and Physical Coding

Sublayer (PCS). The Receiver PMA and Transmitter PMA block diagrams are shown in

“Figure 2: SerDes Architecture” below.

Figure 2: SerDes Architecture

The SerDes primarily consists of the following blocks:

• PMA

• PCS

• PCS interface to FPGA fabric

• Clocking

• Debug and Test

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Speedster22i SerDes 1
User Guide 1
Table of Contents 2
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List of Figures 5
List of Tables 6
Overview 7
Major standards supported 9
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SerDes Placement 11
SerDes Architecture Overview 12
1. Common 13
3. Digital PMA (DPMA) 14
PCS Self Test Logic 16
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Interface Encapsulation 20
8b/10b Encoder 20
Running Disparity 20
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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
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EFIFO Operation 29
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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
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Configurations Supported 45
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Single-Lane Serdes Wrapper 50
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Overview Section: 53
Entry field 54
Purpose 54
Available Options 54
Choice made 54
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Section on PMA Settings: 57
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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
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Files Generated by ACE-GUI 71
Design and Wrapper Files 72
Sequence 74
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Placement of SerDes 77
Timing Constraints 78
Design Guidelines 80
Figure 37: Clock Region View 82
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Wide Bus 86
Design Tips 87
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Design Bypassing PCS: 93
Modification – 1 (ACE GUI): 94
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ACX_SERDES_SBUS_IF Module 99
General signals: 100
SerDes signals: 100
Parallel Interface signals: 100
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Pass-through signals: 102
Loopback Modes 102
SerDes signals 102
Control signals 102
SerDes Registers 103
Electrical Specifications 104
Transmitter 105
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Receiver 108
Eye Diagram 110
Reference Clock 112
Revision History 113

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