XAUI IP Core User's Guide

XAUI IP Core User’s Guide
January 2012
IPUG68_01.6
Table of Contents
Chapter 1. Introduction .......................................................................................................................... 4
Quick Facts ........................................................................................................................................................... 4
Features ................................................................................................................................................................ 4
Chapter 2. Functional Description ........................................................................................................ 6
XAUI IP Core I/O................................................................................................................................................... 9
Functional Description......................................................................................................................................... 10
XGMII and Slip Buffers............................................................................................................................... 14
XAUI-to-XGMII Translation (Receive Interface) ......................................................................................... 15
XGMII-to-XAUI Translation (Transmit Interface) ........................................................................................ 16
Management Data Input/Output (MDIO) Interface (Optional) .................................................................... 18
Management Frame Structure ................................................................................................................... 19
Register Descriptions .......................................................................................................................................... 20
Input/Output Timing............................................................................................................................................. 22
XGMII Specifications.................................................................................................................................. 22
XAUI Specifications.................................................................................................................................... 24
MDIO Specifications................................................................................................................................... 24
Chapter 3. Parameter Settings ............................................................................................................ 25
XAUI IP Configuration Dialog Box....................................................................................................................... 25
Parameter Descriptions....................................................................................................................................... 25
Tx Slip Buffer.............................................................................................................................................. 25
Rx Slip Buffer ............................................................................................................................................. 26
MDIO.......................................................................................................................................................... 26
Behavioral Model ....................................................................................................................................... 26
Netlist [.ngo] ............................................................................................................................................... 26
Evaluation Directory ................................................................................................................................... 26
Tools Support............................................................................................................................................. 26
Chapter 4. IP Core Generation............................................................................................................. 27
Licensing the IP Core.......................................................................................................................................... 27
Getting Started .................................................................................................................................................... 27
IPexpress-Created Files and Top Level Directory Structure............................................................................... 29
Instantiating the Core ................................................................................................................................. 30
Running Functional Simulation .................................................................................................................. 31
Synthesizing and Implementing the Core in a Top-Level Design .............................................................. 31
Hardware Evaluation........................................................................................................................................... 32
Enabling Hardware Evaluation in Diamond................................................................................................ 32
Enabling Hardware Evaluation in ispLEVER.............................................................................................. 32
Updating/Regenerating the IP Core .................................................................................................................... 33
Regenerating an IP Core in Diamond ........................................................................................................ 33
Regenerating an IP Core in ispLEVER ...................................................................................................... 33
Chapter 5. Support Resources ............................................................................................................ 35
Lattice Technical Support.................................................................................................................................... 35
Online Forums............................................................................................................................................ 35
Telephone Support Hotline ........................................................................................................................ 35
E-mail Support ........................................................................................................................................... 35
Local Support ............................................................................................................................................. 35
Internet ....................................................................................................................................................... 35
References.......................................................................................................................................................... 35
LatticeECP3 ............................................................................................................................................... 35
LatticeECP2M ............................................................................................................................................ 35
© 2012 Lattice Semiconductor Corp. All Lattice trademarks, registered trademarks, patents, and disclaimers are as listed at www.latticesemi.com/legal. All other brand
or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice.
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Table of Contents
Revision History .................................................................................................................................................. 36
............................................................................................................................................................................ 36
Appendix A. Resource Utilization ....................................................................................................... 37
LatticeECP2M FPGAs......................................................................................................................................... 37
Ordering Part Number................................................................................................................................ 37
Jitter and XAUI Compliance ....................................................................................................................... 37
LatticeECP3 FPGAs............................................................................................................................................ 38
Ordering Part Number................................................................................................................................ 38
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XAUI IP Core User’s Guide
Chapter 1:
Introduction
The 10Gb Ethernet Attachment Unit Interface (XAUI) IP Core User’s Guide for the LatticeECP2M™ and
LatticeECP3™ FPGAs provides a solution for bridging between XAUI and 10-Gigabit Media Independent Interface
(XGMII) devices. This IP core implements 10Gb Ethernet Extended Sublayer (XGXS) capabilities in soft logic that
together with PCS and SERDES functions implemented in the FGPA provides a complete XAUI-to-XGMII solution.
The XAUI IP core package comes with the following documentation and files:
• Protected netlist/database
• Behavioral RTL simulation model
• Source files for instantiating and evaluating the core
The XAUI IP core supports Lattice’s IP hardware evaluation capability, which makes it possible to create versions of
the IP core that operate in hardware for a limited period of time (approximately four hours) without requiring the purchase on an IP license. It may also be used to evaluate the core in hardware in user-defined designs. Details for
using the hardware evaluation capability are described in the Hardware Evaluation section of this document.
Quick Facts
Table 1-1 gives quick facts about the XAUI IP core.
Table 1-1. XAUI IP Core Quick Facts
XAUI IP Configuration
Across All IP configurations
FPGA Families Supported
Lattice ECP3, Lattice ECP2M
Core Requirements
Minimal Device Supported
LFE3-17E-7FN256C
LFE2M20E-6F256C
72 bits
72 bits
1700-2700
1800-2800
0-4
0-4
1500-2700
1500-2700
Data Path Width
LUTs
Resource Utilization
sysMEM EBRs
Registers
Diamond® 1.0 or ispLEVER® 8.1
Lattice Implementation
Synopsys® Synplify™ Pro for Lattice D-2009.12L-1
Synthesis
Mentor Graphics® Precision™ RTL
Design Tool Support
Aldec® Active-HDL™ 8.2 Lattice Edition
Simulation
Mentor Graphics ModelSim™ SE 6.3F (Verilog only)
Features
• XAUI compliant functionality supported by embedded SERDES PCS functionality implemented in the
LatticeECP2M and LatticeECP3, including four channels of 3.125 Gbps serializer/deserializer with 8b10b encoding/decoding.
• Complete 10Gb Ethernet Extended Sublayer (XGXS) solution based on LatticeECP2M and LatticeECP3 FPGA.
• Soft IP targeted to the FPGA implements XGXS functionality conforming to IEEE 802.3-2005, including:
– 10 GbE Media Independent Interface (XGMII).
– Optional slip buffers for clock domain transfer to/from the XGMII interface.
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Introduction
– Complete translation between XGMII and XAUI PCS layers, including 8b10b encoding and decoding of Idle,
Start, Terminate, Error and Sequence code groups and sequences, and randomized Idle generation in the
XAUI transmit direction.
– XAUI compliant lane-by-lane synchronization.
– Lane deskew functionality.
– Interface with the high-speed SERDES block embedded in the LatticeECP2M and LatticeECP3 that implements a standard XAUI.
– Optional standard compliant MDIO/MDC interface.
• Aldec and ModelSim simulation models and test benches provided for free evaluation.
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Chapter 2:
Functional Description
XAUI is a high-speed interconnect that offers reduced pin count and has the ability to drive up to 20 inches of PCB
trace on standard FR-4 material. Each XAUI comprises four self-timed 8b10b encoded serial lanes each operating
at 3.125 Gbps and thus is capable of transferring data at an aggregate rate of 10 Gbps.
XGMII is a 156 MHz Double Data Rate (DDR), parallel, short-reach interconnect interface (typically less than 2
inches). It supports interfacing to 10 Gbps Ethernet Media Access Control (MAC) and PHY devices.
The locations of XAUI and XGXS in the 10GbE protocol stack are shown in Figure 2-1. A simplified block diagram
of the XAUI solution is shown in Figure 2-2. The XGMII interface, XGXS coding and state machines and XAUI multichannel alignment capabilities are implemented in the FPGA array. The XAUI 8b10b coding and SERDES functionality are supported by the embedded SERDES_PCS block. An optional MDIO interface module is also
implemented in the FPGA array.
Figure 2-3 shows the I/O interface view of the XAUI IP core.
Figure 2-1. XAUI and XGXS Locations in 10 GbE Protocol Stack
Upper Layers
MAC Control (Optional)
XGMII – 10G Medium Independent Interface
XGXS – XAUI Extender Sublayer
XAUI – 10G Attachment Unit Interface
XSBI – 10G 16-Bit Interface
MDI – Medium Dependent Interface
Media Access Control (MAC)
Reconciliation
* optional sublayer
XGMII
Adding the WIS makes the WAN PHY
XGXS*
XAUI
XGMII/XAUI
XGXS*
XGMII
64b/66b coding
Physical Coding Sublayer (PCS)
WAN-compatible framing
WAN Interface Sublayer (WIS)*
16-bit parallel (OIF)
XSBI
Physical Medium Attachment (PMA)
Retime, SERDES, CDR
Physical Medium Dependent (PMD)
E/O
MDI
Medium
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Functional Description
Figure 2-2. XAUI Solution Simplified Block Diagram
FPGA
Array
PCS
SERDES
XAUI IP Core
MDIO
Optional
xgmii_tx_data[31:0]
HDOUT[P:N]0
xgmii_txclk_156
XGMII
TX
TX SERDES
IDDR
Idle Generator
xgmii_tx_ctrl3:0]
TX Encoder
TX Slip Buffer
72b SDR
@156MHz
HDOUT[P:N]1
HDOUT[P:N]2
HDOUT[P:N]3
REFCLK[P:N]
Optional
xgmii_rx_data[31:0]
HDIN[P:N]0
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RX SERDES
xgmii_rxclk_156
Multichannel
Alignment
ODDR
72b SDR
@156MHz XGMII
RX
RX Decoder
xgmii_rxclk_156_out
RX Slip Buffer
xgmii_rx_ctrl[3:0]
HDIN[P:N]1
HDIN[P:N]2
HDIN[P:N]3
XAUI IP Core User’s Guide
Lattice Semiconductor
Functional Description
Figure 2-3. XAUI IP Core I/O
reset_n
If TX Slip Buffer is selected
clk_156_tx
If RX Slip Buffer is selected
clk_156_rx
power_down
clk_156_asb_tx
twdata_lane0
clk_156_asb_rx
twdata_lane1
rwdata_lane0
twdata_lane2
rwdata_lane1
twdata_lane3
rwdata_lane2
tcomma_lane0
rwdata_lane3
tcomma_lane1
rcomma_lane0
tcomma_lane2
rcomma_lane1
tcomma_lane3
rcomma_lane2
rcomma_lane3
tx_data
If MDIO is NOT selected
rx_data
XAUI IP Core
rx_ctrl
rx_ddr_clk
tx_ctrl
tx_ddr_clk
mca_resync
mca_sync_status
If MDIO is NOT selected
mdin
mdout
mdc
mdtri
sciwritedata
sciwstn
scireaddata
scird
sciaddr
If MDIO is selected
scisel
If MDIO is selected
scien
sciselaux
scienaux
gpo
gpi
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Functional Description
XAUI IP Core I/O
Table 2-1 defines all I/O interface ports available in this core.
Table 2-1. IP Core I/O and Signal Definitions
Name
Width (Bits)
Direction
Description
All Configurations
reset_n
1
I
Active-low asynchronous reset
clk_156_asb_tx
1
I
156MHz XAUI transmit clock (from PCS)
clk_156_asb_rx
1
I
156MHz XAUI receive clock (from PCS)
rwdata_lane0
16
I
XAUI receive data channel 0 (from PCS)
rwdata_lane1
16
I
XAUI receive data channel 1 (from PCS)
rwdata_lane2
16
I
XAUI receive data channel 2 (from PCS)
rwdata_lane3
16
I
XAUI receive data channel 3 (from PCS)
rcomma_lane0
2
I
XAUI receive control channel 0 (from PCS)
rcomma_lane1
2
I
XAUI receive control channel 1 (from PCS)
rcomma_lane2
2
I
XAUI receive control channel 2 (from PCS)
rcomma_lane3
2
I
XAUI receive control channel 3 (from PCS)
twdata_lane0
16
O
XAUI transmit data channel 0 (to PCS)
twdata_lane1
16
O
XAUI transmit data channel 1 (to PCS)
twdata_lane2
16
O
XAUI transmit data channel 2 (to PCS)
twdata_lane3
16
O
XAUI transmit data channel 3 (to PCS)
tcomma_lane0
2
O
XAUI transmit control channel 0 (to PCS)
tcomma_lane1
2
O
XAUI transmit control channel 1 (to PCS)
tcomma_lane2
2
O
XAUI transmit control channel 2 (to PCS)
tcomma_lane3
2
O
XAUI transmit control channel 3 (to PCS)
rx_ddr_clk
1
O
DDR clock from IP Core to the XGMII TX direction
tx_ddr_clk
1
O
DDR clock from IP Core to the XGMII receive direction
tx_data
64
I
IP Core transmit data from XGMII RX
tx_ctrl
8
I
IP Core transmit control from XGMII RX
rx_data
64
O
Receive data from core and sent to XGMII TX
rx_ctrl
8
O
Receive control from core and sent to XGMII TX
With Optional Rx Slip Buffer
clk_156_rx
1
I
156MHz XGMII TX clock
rx_fifo_empty
1
O
Rx slip buffer FIFO empty flag
rx_fifo_full
1
O
Rx slip buffer FIFO full flag
With Optional Tx Slip Buffer
clk_156_tx
1
I
156MHz XGMII RX clock
tx_fifo_empty
1
O
Tx slip buffer FIFO empty flag
tx_fifo_full
1
O
Tx slip buffer FIFO full flag
mca_resync
1
I
XAUI multi-channel alignment resynchronization request
mca_sync_status
1
O
XAUI multi-channel alignment status.
1 = All XAUI channels are aligned 0 = XAUI channels are not aligned
No MDIO Option
MDIO Option
mdin
1
I
MDIO serial input data
mdc
1
I
MDIO input clock
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Functional Description
Table 2-1. IP Core I/O and Signal Definitions (Continued)
Name
Width (Bits)
Direction
1
O
mdtri
1
O
Tristate control for MDIO port
scireaddata
8
I
SCI read data (from PCS)
sciwritedata
8
O
SCI write data (to PCS)
sciwstn
1
O
SCI write strobe
scird
1
O
SCI read probe
mdout
Description
MDIO serial output data
sciaddr
6
O
SCI address bus
scisel
4
O
SCI quad select
scien
4
O
SCI quad enable
sciselaux
1
O
SCI auxiliary select
scienaux
1
O
SCI auxiliary enable
gpi
4
I
General purpose input
gpo
4
O
General purpose output
Functional Description
The XAUI receive path, shown in Figure 2-4, is the data path from the XAUI to the XGMII interface. In the receive
direction, 8b10b encoded data received at the XAUI SERDES interface is demultiplexed and passed to the multichannel alignment block, that compensates for lane-to-lane skew between the four SERDES channels as specified
in 802.3-2005. The aligned data streams are passed to decoder logic, where it is translated and mapped to the
XGMII data format. The output of the encoder is then passed through an optional slip buffer that compensates for
XAUI and XGMII timing differences and then to the XGMII 36-bit (32-bit data and four control bits) 156 MHz DDR
external interface.
The receive direction data translations are shown in Figure 2-5. The 8b10b symbols on each XAUI lane are converted to XGMII format and passed to the corresponding XGMII lane. The XGMII comprises four lanes, labeled
[0:3], and one clock in both transmit and receive directions. Each lane includes eight data signals and one control
signal. Double Data Rate (DDR) transmission is utilized, with the data and control signals sampled on both the rising and falling edges of a 156.25 MHz (nom) clock for an effective data transfer rate of 2.5Gbps.
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Functional Description
Figure 2-4. XAUI IP Core Receive Path
With Optional Receive Direction Slip Buffer
FPGA
XAUI IP CORE
156MHz
clk_156_rx
xgmii_txclk_156
REFCLK
xgmii_txclk_156_out
rx_ddr_clk
72b @
156MHz
clk_156_rx_asb
18b
RX SERDES
XGMII
TX
DDR
Output 72b @
156MHz
Check End
xgmii_tx_ctrl[3:0]
Rx Decoder
RX Slip Buffer
xgmii_tx_data[31:0]
Multichannel Alignment
PLL
Deskew Check
sm
90°
18b
18b
18b
HDIN[P:N]0
HDIN[P:N]1
HDIN[P:N]2
HDIN[P:N]3
Without Optional Receive Direction Slip Buffer
FPGA
XAUI IP CORE
156MHz
REFCLK
xgmii_txclk_156_out
rx_ddr_clk
72b @
156MHz
11
18b
18b
18b
18b
RX SERDES
IPUG68_01.6, January 2012
Check End
xgmii_tx_ctrl[3:0]
XGMII
TX
DDR 72b @
Output 156MHz
Rx Decoder
xgmii_tx_data[31:0]
clk_156_rx_asb
Multichannel Alignment
PLL
Deskew Check
sm
90°
HDIN[P:N]0
HDIN[P:N]1
HDIN[P:N]2
HDIN[P:N]3
XAUI IP Core User’s Guide
Lattice Semiconductor
Functional Description
Figure 2-5. XAUI IP Core Receive Direction Data Translations
XAUI Lane 0
Lane 1
Lane 2
Lane 3
XGXS Receive Function
a b c d e i f g h j
0 0 1 1 1 1 1 X X X properly aligned comma
10b8b decoding
K A B C D E FG H
XGXS mapping
C 01 2 3 4 5 67
XGMII
xgmii_tx_data[7:0]
xgmii_tx_ctrl[0]
xgmii_tx_data[15:8] xgmii_tx_data[23:16] xgmii_tx_data[31:24]
xgmii_tx_ctrl[1]
xgmii_tx_ctrl[2]
xgmii_tx_ctrl[3]
The transmit path, shown in Figure 2-6, is the data path from XGMII to XAUI. In the transmit direction, the 36-bit
DDR data and control received at the XGMII are converted to single-edge timing and passed through an optional
slip buffer that compensates for XAUI and XGMII timing differences. The XGMII data and control are then passed
to the TX encoder, where they are translated and mapped to the 8b10b XAUI transmission code and then passed
to the SERDES interface.
The transmit direction data translations are shown in Figure 2-7. Data and control from each of the four XGMII
lanes are translated and mapped to the corresponding XAUI lanes. The transmit encoder includes the transmit idle
generation state machine that generates a random sequence of /A/, /K/ and /R/ code groups as specified in IEEE
802.3-2005.
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Functional Description
Figure 2-6. XAUI IP Core Transmit Path
With Optional Transmit Direction Slip Buffer
FPGA
XAUI IP CORE
xgmii_rxclk_156
PLL
156MHz
clk_156_tx
REFCLK
tx_ddr_clk
18b
RX SERDES
xgmii_rx_ctrl[3:0]
TX Encoder
XGMII
RX
DDR 72b @
Input 156MHz
TX Slip Buffer
xgmii_rx_data[31:0]
clk_156_tx_asb
18b
18b
18b
HDOUT[P:N]0
HDOUT[P:N]1
HDOUT[P:N]2
HDOUT[P:N]3
72b @
156MHz
Without Optional Transmit Direction Slip Buffer
FPGA
XAUI IP CORE
xgmii_rxclk_156
PLL
156MHz
clk_156_tx
REFCLK
clk_156_tx_asb
tx_ddr_clk
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18b
18b
18b
RX SERDES
xgmii_rx_ctrl[3:0]
XGMII
RX
DDR
Input
TX Encoder
xgmii_rx_data[31:0]
18b
HDOUT[P:N]0
HDOUT[P:N]1
HDOUT[P:N]2
HDOUT[P:N]3
72b @
156MHz
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Functional Description
Figure 2-7. XAUI IP Core Transmit Direction Data Translations
xgmii_rx_data[7:0]
xgmii_rx_ctrl[0]
xgmii_rx_data[15:8] xgmii_rx_data[23:16]
xgmii_rx_ctrl[1]
xgmii_rx_ctrl[2]
xgmii_rx_data[31:24]
xgmii_rx_ctrl[3]
XGMII
XGXS Transmit Function
C 0 1 2 3 4 5 6 7
XGXS mapping
K A B C D E FG H
10b8b decoding
a b c d e i f g h j
XAUI Lane 0
Lane 1
Lane 2
Lane 3
XGMII and Slip Buffers
The 10Gigabit Media Independent Interface (XGMII) supported by the XAUI IP core solution conforms to Clause 46
of IEEE 802.3-2005. The XGMII is composed of independent transmit and receive paths. Each direction uses 32
data signals, four control signals and a clock. The 32 data signals in each direction are organized into four lanes of
eight signals each. Each lane is associated with a control signal as shown in Table 2-2.
Table 2-2. XGMII Transmit and Receive Lane Associations1
Tx data (xgmii_rx_data)
Rx data (xgmii_tx_data)
Tx control (xgmii_rx_ctrl)
Rx control (xgmii_tx_ctrl)
XAUI Lane
[7:0]
[0]
0
[15:8]
[1]
1
[23:16]
[2]
2
[31:24]
[3]
3
1. The XGMII TX signals are XGXS inputs to the transmit path (XGMII to XAUI). The
XGMII RX signals are XGXS outputs of the receive path (XAUI to XGMII).
The XGMII supports Double Data Rate (DDR) transmission (i.e., the data and control input signals are sampled on
both the rising and falling edges of the corresponding clock). The XGXS XGMII input (RX) data is sampled based
on an input clock typically sourced from the XGMII device running at 156.25 MHz, 1/64th of the 10Gb data rate and
is transmitted by the IP transmit part. The XGXS XGMII output (TX) data is referenced to a forwarded clock that is
phase locked to a 156.25 MHz (typical) input reference, and the data is received from the IP receiver part.
The control signal for each lane is de-asserted when a data octet is being sent on the corresponding lane and
asserted when a control character is being sent. Supported control octet encodings are shown in Table 2-3. All
data and control signals are passed directly to/from the 8b10b encoding/decoding blocks with no further processing by the XGMII block. Note that the packet Start control word is only valid on lane 0.
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Functional Description
Table 2-3. XGMII Control Encoding
Control
Data
Description
0
0x00 - 0xFF
Normal data transmission
1
0x00 - 0x06
Reserved
1
0x07
Idle
1
0x08 - 0x9B
Reserved
1
0x9C
Sequence (only valid on lane 0)
1
0x9D - 0xFA
Reserved
1
0xFB
Start (only valid on lane 0)
1
0xFC
Reserved
1
0xFD
Terminate
1
0xFE
Error
1
0xFF
Reserved
The XGMII blocks incorporate optional slip buffers that accommodate small differences between XGMII and XAUI
timing by inserting or deleting idle characters. The slip buffer is implemented as a 256 x 72 FIFO. There are four
flags out of the FIFO: full, empty, partially full, and partially empty. The partially empty flag is used as the watermark
to start reading from the FIFO. If the difference between write and read pointers falls below the partially empty
watermark and the entire packet has been transmitted, idle characters are inserted until the partially full watermark
is reached. No idle is inserted during data transmission.
XAUI-to-XGMII Translation (Receive Interface)
A block diagram of the XAUI IP core receive data path was shown previously in Figure 2-4. The IP receive interface
converts the incoming XAUI stream into XGMII-compatible signals. At the embedded core interface, the IP core
receive block receives 72 bits of data at 156 MHz (64 bits of data, 8 bits of control) from four XAUI lanes. Data from
the embedded core are first passed to the RX multi-channel aligner block to de-skew the four XAUI lanes.
The multi-channel alignment block consists of four 16-byte deep FIFOs to individually buffer each XAUI lane. The
multi-channel alignment block searches for the presence of the alignment character /A/ in each XAUI lane, and
begins storing the data in the FIFO when the /A/ character is detected in a lane. When the alignment character has
been detected in all four XAUI lanes, the data is retrieved from each FIFO so that all of the alignment characters /A/
are aligned across all four XAUI lanes. Once synchronization is achieved, the block does not resynchronize until a
resynchronization request is issued.
The data from the RX multi-channel alignment is passed to the RX decoder. The RX decoder block converts the
XAUI code to the corresponding XGMII code. Table 2-4 shows the 8b10b code points. Table 2-5 shows the code
mapping between the two domains in the receive direction. XAUI /A/, /R/, /K/ characters are translated into XGMII
Idle (/I/) characters.
Data from the RX decoder block is written to the RX slip buffer. As mentioned previously, the slip buffers are
required to compensate for differences in the write and read clocks derived from the XAUI and XGMII reference
clocks, respectively. Clock compensation is achieved by deleting (not writing) idle cells into the buffer when the
“almost full” threshold is reached and by inserting (writing) additional idle cells into the buffer when the “almost
empty” threshold is reached. All idle insertion/deletion occurs during the Inter-Packet Gap (IPG) between data
frames.
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Functional Description
Table 2-4. XAUI 8b10b Code Points
Symbol
Name
/A/
Align
Lane Alignment (XGMII Idle)
K28.3
/K/
Sync
Code-Group Alignment (XGMII Idle)
K28.5
/R/
Skip
Clock Tolerance Compensation (XGMII Idle)
K28.0
/S/
Start
Start of Packet Delimiter (in Lane 0 only)
K27.7
/T/
Terminate
/E/
Error
/Q/
Sequence
/d/
Data
Function
Code Group
End of Packet Delimiter
K29.7
Error Propagation
K30.7
Link Status Message Indicator
K28.4
Information Bytes
Dxx.x
Table 2-5. XAUI 8b10b to XGMII Code Mapping
8b10b Data from
Embedded Core [7:0]
XGMII Data [7:0]
XGMII Control [3:0]
Dxx.x
0x00-0xFF (Data)
0
K28.5 (0xBC)
0x07 (Idle)
1
K28.3 (0x7C)
0x07 (Idle)
1
K28.0 (0x1C)
0x07 (Idle)
1
K27.7 (0xFB)
0xFB (Start)
1
K29.7 (0xFD)
0xFD (Terminate)
1
K30.7 (0xFE)
0xFE (Error)
1
K28.4 (0x9C)
0x9C (Ordered Set)
1
XGMII-to-XAUI Translation (Transmit Interface)
A block diagram of the XAUI IP core transmit data path was shown previously in Figure 2-6. The TX interface converts the incoming XGMII data into XAUI-compatible characters. 36-bit XGMII DDR input data and control signals
are initially converted to a 72-bit bus based on a single edge 156MHz clock. The data and control read are then
passed into an optional TX slip buffer identical to the one used for the RX interface.
After the slip buffer, the XGMII formatted transmit data and control are input to the TX encoder that converts the
XGMII characters into 8b10b format as shown in Table 7. The idle generation state machine in the TX encoder converts XGMII /I/ characters to a random sequence of XAUI /A/, /K/ and /R/ characters as specified in IEEE 802.32005. XGMII idles are mapped to a random sequence of code groups to reduce radiated emissions. The /A/ code
groups support XAUI lane alignment and have a guaranteed minimum spacing of 16 code-groups. The /R/ code
groups are used for clock compensation. The /K/ code groups contain the 8b10b comma sequence.
Table 2-6. XGMII to XAUI Code Mapping
XGMII
XAUI
Idle
/I/ = 0x07
Randomized /A/, /R/, /K/ Sequence
/A/ = K28.3 = 0x7C
/R/ = K28.0 = 0x1C
/K/ = K28.5 = 0xBC (Comma)
Start
/S/ = 0xFB
/S/ = 0xFB
Error
/E/ = 0xFE
/E/ = 0xFE
Terminate
/T/ = 0xFD
/T/ = 0xFD
Ordered Set
/Q/ = 0x9C
/Q/ = 0x9C
Data
Control = 0
Control = 0
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Functional Description
The random /A/, /R/, /K/ sequence is generated as specified in section 48.2.5.2.1 of IEEE 802.3-2005 and shown in
the state machine diagram given in Figure 2-8. In addition to idle generation, the state machine also forwards
sequences of ||Q|| ordered sets used for link status reporting. These sets have the XGMII sequence control character on lane 0 followed by three data characters in XGMII lanes 1 through 3. Sequence ordered-sets are only sent
following an ||A|| ordered set.
The random selection of /A/, /K/, and /R/ characters is based on the generation of uniformly distributed random
integers derived from a PRBS. Minimum ||A|| code group spacing is determined by the integer value generated by
the PRBS (A_cnt in Figure 2-8). ||K|| and ||R|| selection is driven by the value of the least significant bit of the generated integer value (code_sel in Figure 2-8). The idle generation state machine specified in IEEE 802.3-2005 and
shown in Figure 2-7 transitions between states based on a 312 MHz system clock. The TX encoder implemented in
the XAUI IP runs at a system clock rate of 156 MHz. Thus the XGXS state machine implementation performs the
equivalent of two state transitions each clock cycle.
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Functional Description
Figure 2-8. XGXS Idle Transmit State Diagram
!reset *
!(TX=||IDLE|| + TX=||Q||)
SEND_DATA
IF TX=||T|| THEN cvtx_terminate
TX_code-group<39:0>
ENCODE(TX)
PUDR
(next_ifg = K + A_CNT00)reset
next_ifg = A * A_CNT=0
SEND_A
TX_code-group<39:0>
K
next_ifg
PUDR
SEND_K
||A||
TX_code-group<39:0>
A
next_ifg
PUDR
||K||
UCT
Q_det!Q_det
B
SEND_Q
TX_code-group<39:0>
Q_det
false
PUDR
TQMSG
B
A
A_CNT00 *
code_sel=1
UCT
SEND_RANDOM_R
TX_code-group<39:0>
PUDR
A_CNT00 *
code_sel=0
SEND_RANDOM_K
||R||
TX_code-group<39:0>
PUDR
A_CNT=0
A
B
A_CNT=0
SEND_RANDOM_A
TX_code-group<39:0>
PUDR
||K||
A
A_CNT00 *
code_sel=1
A_CNT00 *
code_sel=0
||A||
Q_det
B
!Q_det *
code_sel=1
SEND_RANDOM_Q
TX_code-group<39:0>
false
Q_det
PUDR
TQMSG
B
A
A
!Q_det *
code_sel=0
code_sel=1
code_sel=0
Management Data Input/Output (MDIO) Interface (Optional)
The MDIO interface provides access to the internal XAUI core registers. The register access mechanism corresponds to Clause 45 of IEEE 802.3-2005. The XAUI core provides access to XGXS registers 0x0000-0x0024 as
specified in IEEE 802.3-2005. Additional registers in the vendor-specific address space have been allocated for
implementation-specific control/status functions.
The physical interface consists of two signals: MDIO to transfer data/address/control to and from the device, and
MDC, a clock up to 2.5 MHz sourced externally to provide the synchronization for MDIO. The fields of the MDIO
transfer are shown in Figure 2-9.
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Functional Description
Figure 2-9. Fields of MDIO Protocol
ST
2b
OP
2b
PRTAD
5b
DTYPE*
5b
TA
2b
ADDRESS/DATA
16b
ST=00
VALUE
OP
ACCESS TYPE
00
ADDRESS
01
WRITE
10
READ INCREMENT
11
READ
DEVICE TYPE
0
RESERVED
1
10G PMA/PMD
2
10G WIS
ACCESS TYPE
CONTENTS
ADDRESS
RESERVED
WRITE
10G PMA/PMD
READ INCREMENT 10G WIS
3
10G PCS
4
10G PHY XGXS
5
10G DTE XGXS
6-15
RESERVED
16-31
VENDOR SPECIFIC
READ
10G PCS
* If ST=01, this field is REGAD (register address).
Management Frame Structure
Each management data frame consists of 64 bits. The first 32 bits are preamble consisting of 32 contiguous 1s on
the MDIO. Following the preamble is the start-of-frame field (ST) which is a 00 pattern. The next field is the operation code (OP) that is shown in Figure 2-9.
The next two fields are the port address (PRTAD) and device type (DTYPE). Since the physical layer function in 10
GbE is partitioned into various logical (and possibly separate physical) blocks, two fields are used to access these
blocks. The PRTAD provides the overall address to the PHY function. The first port address bit transmitted and
received is the MSB of the address. The DTYPE field addresses the specific block within the physical layer function.
Device address zero is reserved to ensure that there is not a long sequence of zeros. If the ST field is 01 then the
DTYPE field is replaced with REGAD (register address field of the original clause 22 specification). The XAUI core
does not respond to any accesses with ST = 01.
The TA field (Turn Around) is a 2-bit turnaround time spacing between the device address field and the data field to
avoid contention during a read transaction. The TA bits are treated as don’t cares by the XAUI core.
During a write or address operation, the address/data field transports 16 bits of write data or register address
depending on the access type. The register is automatically incremented after a read increment. The address/data
field is 16 bits.
For an address cycle, this field contains the address of the register to be accessed on the next cycle. For
read/write/increment cycles, the field contains the data for the register. The first bit of data transmitted and received
in the address/data field is the MSB (bit 15). An example access is shown in Figure 2-10.
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Functional Description
Figure 2-10. Indirect Address Example
PREAMBLE, 32-BIT
ALL ONES
ST OP PHYADDR
00 00
0_0000
DTYPE
0_0100
ADDRESS/DATA
0000_1111_0000_0001
TA
PREAMBLE, 32-BIT
ALL ONES
REGISTER ADDRESS
TO BE ACCESSED
OP = ADDRESS
ST OP PHYADDR
00 10
0_0000
DTYPE
0_0100
TA
OP = READ
DEVICE TYPE = XGXS
ADDRESS/DATA
0000_1010_0101_1111
DATA RETURNED
DEVICE TYPE = XGXS
Table 2-7 shows PHY XGXS registers as described in IEEE 802.3-2005. The shaded areas are used to indicate
register addresses that are specified in the draft but are not used in this implementation.
There are two vendor supported register ranges. The 4.8000h register range is used for accessing and programming the XGXS registers implemented in the programmable array. All corresponding registers are listed in Table 28. All PCS embedded core registers can be accessed thru the 4.9xxxh registers shown in Table 2-9, where the
address is directly mapped to the PCS embedded registers.
Register Descriptions
Table 2-7. Register Map for XAUI IP Core (Device Address = 4)
Register Address
0
Register Name
PHY XGXS Control 1
1
PHY XGXS Status 1
2, 3
PHY XGXS Identifier
4
5
6 - 23
24
25 - 32767
32768 - 65535
Reserved
PHY XGXS Status 2
Reserved
10G PHY XGXS Lane status
Reserved
Vendor specific
Table 2-8. XAUI IP Core Registers
Bit(s)
Name
Description
R/W
Reset Value
R/W S/C
0
Control 1 Register
4.0.15
Reset
1 = PHY XA reset, 0 = Normal operation
4.0.14
Loopback
(not supported)
Loop back functionality is supported in the PCS core.
The XAUI core does not provide loopback capability.
R
0
4.0.13
Speed Selection
Value always 0
R
0
4.0.12
Reserved
Value always 0
R
0
4.0.11
Low Power
0= Low Power Mode 1= Normal operation This bit controls
the power_down signal of the XAUI core.
R/W
1
4.0.[10:7]
Reserved
Value always 0
R
0
4.0.6
Speed Selection
Value always 0
R
0
4.0.[5:2]
Speed Selection
Value always 0
R
0
4.0.[1:0]
Reserved
Value always 0
R
0
Value always 0
R
0
Status 1 Register
4.1.[15:8]
Reserved
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Functional Description
Table 2-8. XAUI IP Core Registers (Continued)
Bit(s)
Name
Description
R/W
Reset Value
4.1.7
Fault (not supported) 0 = No Fault condition
R
0
4.1.[6:3]
Reserved
Value always 0
R
0
4.1.2
PHY XS TX link status (not supported)
The Link status is available in the PCS core register.
R
0
4.1.1
Low Power Ability
1 = Low Power Mode support
R
1
4.1.0
Reserved
Value always 0
R
0
XGXS Identifier Registers
4.2:[15:0]
PHY XS Identifier
MSB = 0x0000
R
0
4.3:[15:0]
PHY XS Identifier
LSB = 0x0004
R
0004
XGXS Reserved Register
4.4.[15:1]
Reserved
Value always 0
R
0
4.4.0
10 G Capable
Value always 1
R
1
Value always 0
R
0
Status 1 Register
4.5.[15:6]
Reserved
4.5.5
DTE XS Present
Value always 0
R
0
4.5.4
PHY XS Present
Value always 1
R
1
4.5.3
PCS Present
Value always 0
R
0
4.5.2
WIS Present
Value always 0
R
0
4.5.1
PMD/PMA Present
Value always 0
R
0
4.5.0
Clause 22 regs pres- Value always 0
ent
R
0
Value always 0
R
0
XGXS Reserved Register
4.6.15
Vendor specific
device present
4.6.[14:0]
Reserved
Value always 0
R
0
4.8.[15:14]
Device present
10 = Device responding to this address
R
10
4.8.[13:12]
Reserved
Value always 0
R
0
4.8.11
Transmit Fault
(not supported)
0 = No fault of tx path
R
0
4.8.10
Receive Fault
(not supported)
0 = No fault of tx path
R
0
4.8.9:0
Reserved
Value always 0
R
0
4.15, 4.14
Package Identifier
Value always 0
R
0
4.24.[15:13]
Reserved
Value always 0
R
0
4.24.12
PHY XGXS Lane
Alignment
(not supported)
TX alignment status is available in the PCS core register
R
00
4.24.11
Pattern Testing ability 0 = Not able to generate pattern.
R
0
4.24.10
PHY XGXS has loop 1 = Has loop back capability
back capability
R
1
4.24.[9:4]
Reserved
Value always 0
R
0
4.24.3
Lane 3 Sync (not
supported)
Status is available from the PCS core
R
00
4.24.2
Lane 2 Sync (not
supported)
Status is available from the PCS core
R
00
4.24.1
Lane 1 Sync (not
supported)
Status is available from the PCS core
R
00
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Functional Description
Table 2-8. XAUI IP Core Registers (Continued)
Bit(s)
Name
Description
R/W
Reset Value
4.24.0
Lane 0 Sync (not
supported)
Status is available from the PCS core
R
00
4.25.15:3
Reserved
Value always 0
R
0
4.25.2
Receive test pattern
enable
0 = Receive test pattern not enabled
R
0
4.25.1:0
Test pattern select
00
R
00
4.8000.[15:0]
MCA Sync Request
Writing any value to this register triggers the MCA sync
request. This register always read as 0.
R/W
0
4.8001.15
MCA Sync Status
This bit provides MCA synchronization status.
R/W
0
4.8002.[15:8]
Unused
Bit [15:8] are unused
R/W
0
4.8002.[7:0]
GPO
This field controls the General Purpose Outputs (GPO)
when the MDIO is enabled. It is intended to control optional
ports of the PCS core.
R/W
0
4.8003.[15:8]
Unused
Bit [15:8] are unused
R/W
0
4.8003.[7:0]
GPI
This field senses the state of the General Purpose Inputs
(GPI) when the MDIO is enabled. It is intended to sense the
status control of the PCS core.
R/W
0
Table 2-9. XAUI Vendor Specific Registers 4.9xxxh
Bit(s)
Name
Description
4.9xxxx.[15:8] Unused
4.9xxxx.[7:0]
Bit [15:8] are unused
PCS register access Bit [7:0] are directly mapped to sci_data port.
Address [5:0] are directly mapped to sci_address port [5:0].
Address bit [8:6] are used to decode which SCI quad is
being selected.
[8:6] = 0 SCI0 is selected
[8:6] = 1 SCI1 is selected
[8:6] = 2 SCI2 is selected
[8:6] = 3 SCI3 is selected
[8:6] = 4 SCI AUX is selected
R/W
Reset Value
R/W
0
R/W
0
Input/Output Timing
XGMII Specifications
Clause 46 if IEEE 802.3-2005 specifies HSTL1 I/O with a 1.5V output buffer supply voltage for all XGMII signals.
The HSTL1 specifications comply with EIA/JEDEC standard EIA/JESD8-6 using Class I output buffers with output
impedance greater than 38¾ to ensure acceptable overshoot and undershoot performance in an unterminated
interconnection. The parametric values for HSTL XGII signals are given in Table 2-10. The HSTL termination
scheme is shown in Figure 2-11. Timing requirements for chip-to-chip XGMII signals are shown in Figure 2-12.
Table 2-10. XGMII DC and AC Specifications
Parameter
Condition
Min.
Typ.
Max.
Units
VDDIO
-
1.4
1.5
1.8
V
VREF
-
0.68
0.75
0.9
V
VTT1
-
-
0.75
-
V
VIH
-
VREF + 100mV
0.85
VDDIO + 0.3
V
VIL
-
-0.3
0.65
VREF - 100mV
V
VOH2
IOH > 8mA
1
1.1
-
V
VOL
IOL > -8mA
-
-
0.4
V
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Functional Description
Figure 2-11. HSTL1 Circuit Topology
VDDIO = 1.5V
R = 50 Ω
Z = 50
VREF = 0.75V
Figure 2-12. XGMII Timing Parameters
tpwmi
tpwmi
n
n
xgmii_txclk_156,
xgmii_rxclk_156,
xgmii_rxclk_156_out
VIH_AC(min)
VIL_AC(max)
xgmii_tx_data[31:0],
xgmii_tx_ctrl[3:0],
xgmii_rx_data[31:0],
xgmii_rx_ctrl[3:0]
VIH_AC(min)
VIL_AC(max)
tsetup
tsetup
thold
IPUG68_01.6, January 2012
thold
Symbol
Driver
Receiver
Units
tSETUP
960
480
ps
tHOLD
960
480
ps
tPWMIN
2.5
-
ns
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Functional Description
XAUI Specifications
Refer to the LatticeECP2M and LatticeECP3 PCS specifications for a complete XAUI timing requirements.
MDIO Specifications
The electrical specifications of the MDIO signals conform to Clause 45.4 of IEEE 802.3-2005.
Figure 2-13. MDIO Timing
t1
t2
t3
MDC
t4
t5
MDIO (INPUT)
t6
MDIO (OUTPUT)
Symbol
t1
Description
MDC high pulse width
Min.
Max.
Units
200
—
ns
t2
MDC low pulse width
200
—
ns
t3
MDC period
400
—
ns
t4
MDIO (I) setup to MDC rising edge
10
—
ns
t5
MDIO (O) hold time from MDC rising edge
10
—
ns
t6
MDIO (O) valid from MDC rising edge
0
300
ns
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XAUI IP Core User’s Guide
Chapter 3:
Parameter Settings
The IPexpress™ tool is used to create IP and architectural modules in the Diamond and ispLEVER software. Refer
to “IP Core Generation” on page 27 for a description on how to generate the IP.
Table 3-1 provides the list of user configurable parameters for the XAUI IP core. The parameter settings are specified using the XAUI IP core Configuration GUI in IPexpress.
Table 3-1. XAUI IP Configuration Parameters
Parameter
Configuration Options
Range/Options
Default
Tx Slip Buffer/Rx Slip Buffer/MDIO
Tx Slip Buffer/
Rx Slip Buffer
Behavioral Model/Netlist [.ngo]/
Evaluation Directory
Behavioral
Model/Netlist [.ngo]/
Evaluation Directory
Enable, Disable
Enable
Generation Options
Support Synplify, Support Precision, Support ModelSim,
Support ALDEC
XAUI IP Configuration Dialog Box
Figure 3-1 shows the XAUI IP core configuration dialog box.
Figure 3-1. XAUI IP Configuration Dialog Box
Parameter Descriptions
This section describes the available parameters for the XAUI IP core.
Tx Slip Buffer
This option allows the user to include a slip buffer in the XAUI transmit direction for clock tolerance compensation
(enabled by default).
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Parameter Settings
Rx Slip Buffer
This option allows the user to include a slip buffer in the XAUI receive direction for clock tolerance compensation
(enabled by default).
MDIO
This option allows the user to include an MDIO interface providing access to XAUI IP core internal registers (disabled by default).
Behavioral Model
This option creates behavioral simulation model for IP core (always enabled).
Netlist [.ngo]
This option creates a netlist (.ngo file) for IP core (always enabled).
Evaluation Directory
This option creates an evaluation directory for IP core that includes simulation and implementation example projects (always enabled).
Tools Support
The XAUI IP core evaluation capability supports multiple synthesis and simulation tool flows. These options allow
the user to select desired tool support.
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Chapter 4:
IP Core Generation
This chapter provides information on licensing the XAUI IP core, generating the core using the Diamond or ispLEVER software IPexpress tool, running functional simulation, and including the core in a top-level design. The Lattice XAUI IP core can be used in LatticeECP3 and LatticeECP2M device families.
Licensing the IP Core
An IP license is required to enable full, unrestricted use of the XAUI IP core in a complete, top-level design. An IP
license that specifies the IP core (XAUI) and device family (ECP3 or ECP2M) is required to enable full use of the
XAUI IP core in LatticeECP2M or LatticeECP3. Instructions on how to obtain licenses for Lattice IP cores are given
at:
http://www.latticesemi.com/products/intellectualproperty/aboutip/isplevercoreonlinepurchas.cfm
Users may download and generate the XAUI IP core for Lattice ECP3 or LatticeECP2M and fully evaluate the core
through functional simulation and implementation (synthesis, map, place and route) without an IP license. The
XAUI IP core also supports Lattice’s IP hardware evaluation capability, which makes it possible to create versions
of the IP core that operate in hardware for a limited time (approximately four hours) without requiring an IP license
(see “Hardware Evaluation” on page 32 for further details). However, a license is required to enable timing simulation, to open the design in the Diamond or ispLEVER EPIC tool, and to generate bitstreams that do not include the
hardware evaluation timeout limitation.
Getting Started
The XAUI IP core is available for download from the Lattice IP Server using the IPexpress tool in Diamond or ispLEVER. The IP files are automatically installed using ispUPDATE technology in any customer-specified directory.
After the IP core has been installed, it will be available in the IPexpress GUI dialog box shown in Figure 4-1.
The IPexpress tool GUI dialog box for the XAUI IP core is shown in Figure 4-1. To generate a specific IP core configuration the user specifies:
• Project Path – Path to the directory where the generated IP files will be loaded.
• File Name – “username” designation given to the generated IP core and corresponding folders and files.
• (Diamond) Module Output – Verilog or VHDL.
• (ispLEVER) Design Entry Type – Verilog HDL or VHDL
• Device Family – Device family to which IP is to be targeted (e.g. LatticeECP2M, LatticeECP3, etc.). Only families that support the particular IP core are listed.
• Part Name – Specific targeted part within the selected device family.
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IP Core Generation
Figure 4-1. IPexpress Dialog Box (Diamond Version)
Note that if the IPexpress tool is called from within an existing project, Project Path, Module Output (Design Entry in
ispLEVER), Device Family and Part Name default to the specified project parameters. Refer to the IPexpress tool
online help for further information.
To create a custom configuration, the user clicks the Customize button in the IPexpress tool dialog box to display
the XAUI SDRAM IP core Configuration GUI, as shown in Figure 4-2. From this dialog box, the user can select the
IP parameter options specific to their application. Refer to “Parameter Settings” on page 25 for more information on
the XAUI parameter settings.
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IP Core Generation
Figure 4-2. Configuration GUI (Diamond Version)
IPexpress-Created Files and Top Level Directory Structure
When the user clicks the Generate button in the IP Configuration dialog box, the IP core and supporting files are
generated in the specified “Project Path” directory. The directory structure of the generated files is shown in
Figure 4-3.
Figure 4-3. XAUI Core Directory Structure
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IP Core Generation
Table 4-1 provides a list of key files and directories created by the IPexpress tool and how they are used. The IPexpress tool creates several files that are used throughout the design cycle. The names of most of the created files
are customized to the user’s module name specified in the IPexpress tool.
Table 4-1. File List
File
Description
<username>.lpc
This file contains the IPexpress tool options used to recreate or modify the core in the IPexpress
tool.
<username>.ipx
The IPX file holds references to all of the elements of an IP or Module after it is generated from
the IPexpress tool (Diamond version only). The file is used to bring in the appropriate files during
the design implementation and analysis. It is also used to re-load parameter settings into the
IP/Module generation GUI when an IP/Module is being re-generated.
<username>.ngo
This file provides the synthesized IP core.
<username>_bb.v/.vhd
This file provides the synthesis black box for the user’s synthesis.
<username>_inst.v/.vhd
This file provides an instance template for the PCI IP core.
<username>_beh.v/.vhd
This file provides the front-end simulation library for the PCI IP core.
Table 4-2 provides a list of key additional files providing IP core generation status information and command line
generation capability are generated in the user's project directory.
Table 4-2. Additional Files
File
<username>_generate.tcl
Description
This file is created when the GUI “Generate” button is pushed. This file may be run from command line.
<username>_generate.log
This is the synthesis and map log file.
<username>_gen.log
This is the IPexpress IP generation log file
The \xaui_core_eval and subtending directories provide files supporting XAUI IP core evaluation. The \models
directory shown in Figure 4-3 contains files/folders with content that is constant for all configurations of the XAUI IP
core. The \<username> subfolder (\XAUI_core0 in this example) contains files/folders with content specific to
the username configuration.
The \xaui_core_eval directory is created by IPexpress the first time the core is generated and updated each
time the core is regenerated. A \<username> directory is created by IPexpress each time the core is generated
and regenerated each time the core with the same file name is regenerated. A separate \<username> directory is
generated for cores with different names, e.g. \xaui_core0, \xaui_core1, etc.
Instantiating the Core
The generated XAUI IP core package includes black-box (<username>_bb.v) and instance (<username>_inst.v)
templates that can be used to instantiate the core in a top-level design. Two example RTL top-level reference
source files are provided in \<project_dir>\xaui_core_eval\<username>\src.
The top-level file <username>_eval.v is the same top-level file that is used in the simulation model described in the
next section. Designers may use this top-level reference as a template for the top level of their design. Included in
<username>_eval.v sample packet generation and checking capabilities at the XGMII interface.
The top-level file <username>_only_top.v supports the ability to implement just the XAUI IP core itself. This design
is intended only to provide an accurate indication of the device utilization associated with the XAUI IP core and
should not be used as an actual implementation example.
To instantiate this IP core using the Linux platform, users must manually add one environment variable named
“SYNPLIFY” to indicate the installation path of the OEM Synplify tool in the local environment file. For example,
SYNPLIFY=/tools/local/isptools7_2/isptools/synplify_linux.
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IP Core Generation
Running Functional Simulation
The functional simulation includes a configuration-specific behavioral model of the XAUI IP core 
(<username>_beh.v) that is instantiated in an FPGA top level along with user-side (XGMII) packet generation and
checking capabilities. The top-level file supporting ModelSim simulation is provided in
\<project_dir>\xaui_core_eval\<username>\src. This FPGA top is instantiated in an evaluation testbench provided in \<project_dir>\xaui_core_eval\<username>\testbench.
Users may run the evaluation simulation by doing the following:
1. Open ModelSim.
2. Under the File tab, select Change Directory and choose folder
<project_dir>\xaui_core_eval\<username>\sim\modelsim.
3. Under the Tools tab, select Execute Macro and execute one of the ModelSim “do” scripts shown.
The simulation waveform results will be displayed in the ModelSim Wave window.
The top-level file supporting Aldec Active-HDL simulation is provided in 
\<project_dir>\xaui_core\<username>\sim\aldec. This is the same top-level that is used for ModelSim
simulation.
Users may run the Aldec evaluation simulation by doing the following:
1. Open Active-HDL.
2. Under the console tab change the directory to
\<project_dir>\xaui_core_eval\<username>\sim\aldec
3. Execute the Active-HDL “do” scripts shown.
The simulation waveform results will be displayed in the Active-HDL Wave window.
Synthesizing and Implementing the Core in a Top-Level Design
The XAUI IP core itself is synthesized and is provided in NGO format when the core is generated. Users may synthesize the core in their own top-level design by instantiating the core in their top level as described previously and
then synthesizing the entire design with either Synplify or Precision RTL Synthesis (Synopsys Synplify is included
with Diamond and ispLEVER. Precision RTL Synthesis is available separately from Mentor Graphics).
Two example RTL top-level configurations supporting the XAUI IP core top-level synthesis and implementation are
provided with the XAUI IP core in \<project_dir>\xaui_core_eval\<username>\impl.
The top-level file xaui_core_eval_only_top.v provided in 
\<project_dir>\eval\<username>\src\rtl\top supports the ability to implement just the XAUI IP core.
This design is intended only to provide an accurate indication of the device utilization associated with the core itself
and should not be used as an actual implementation example.
The top-level file <username>_eval.v provided in
\<project_dir>\eval\<username>\src supports the ability to instantiate, simulate, map, place and route
the XAUI IP core in an example design that include packet generation and checking modules at the XGMII interface. This is the same configuration that is used in the evaluation simulation capability described previously.
Push-button implementation of both top-level configurations is supported via the Diamond or ispLEVER project
files, <username>_core_only_eval.syn and <username>_eval.syn. These files are located in 
\<project_dir>\xaui_core_eval\<username>\impl\(synplify or precision), for implementation
using either the Synplify synthesis tool or Precision synthesis tool, respectively.
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IP Core Generation
For the Linux platform, the top-level synthesis must be run separately with a synthesis tool such as Synplify Pro,
since Diamond and ispLEVER for Linux only accept an EDIF entry. For the core-only project, the synthesis tcl file 
<username>_core_only.tcl is generated in 
\<project_dir>\xaui_core_eval\<username>\impl\synplify. The user can run this tcl script to synthesize the core_only top-level files in the above directory.
For the reference project, <username>_eval.tcl will be generated in the
\<project_dir>\xaui_core_eval\<username>\impl\synplify directory. The user can run this tcl script
to synthesize the reference top_level files in the above directory.
To use this project file in Diamond:
1. Choose File > Open > Project.
2. Browse to 
\<project_dir>\xaui_core_eval\<username>\impl\synplify (or precision) in the Open Project dialog box.
3. Select and open <username>.ldf. At this point, all of the files needed to support top-level synthesis and implementation will be imported to the project.
4. Select the Process tab in the left-hand GUI window.
5. Implement the complete design via the standard Diamond GUI flow.
To use this project file in ispLEVER:
1. Choose File > Open Project.
2. Browse to 
\<project_dir>\xaui_core_eval\<username>\impl\synplify (or precision) in the Open
Project dialog box.
3. Select and open <username>.syn. At this point, all of the files needed to support top-level synthesis and implementation will be imported to the project.
4. Select the device top-level entry in the left-hand GUI window.
5. Implement the complete design via the standard ispLEVER GUI flow.
Hardware Evaluation
The XAUI IP core supports supports Lattice’s IP hardware evaluation capability, which makes it possible to create
versions of the IP core that operate in hardware for a limited period of time (approximately four hours) without
requiring the purchase of an IP license. It may also be used to evaluate the core in hardware in user-defined
designs.
Enabling Hardware Evaluation in Diamond
Choose Project > Active Strategy > Translate Design Settings. The hardware evaluation capability may be
enabled/disabled in the Strategy dialog box. It is enabled by default.
Enabling Hardware Evaluation in ispLEVER
In the Processes for Current Source pane, right-click the Build Database process and choose Properties from the
dropdown menu. The hardware evaluation capability may be enabled/disabled in the Properties dialog box. It is
enabled by default.
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IP Core Generation
Updating/Regenerating the IP Core
By regenerating an IP core with the IPexpress tool, you can modify any of its settings including device type, design
entry method, and any of the options specific to the IP core. Regenerating can be done to modify an existing IP
core or to create a new but similar one.
Regenerating an IP Core in Diamond
To regenerate an IP core in Diamond:
1. In IPexpress, click the Regenerate button.
2. In the Regenerate view of IPexpress, choose the IPX source file of the module or IP you wish to regenerate.
3. IPexpress shows the current settings for the module or IP in the Source box. Make your new settings in the Target box.
4. If you want to generate a new set of files in a new location, set the new location in the IPX Target File box. The
base of the file name will be the base of all the new file names. The IPX Target File must end with an .ipx extension.
5. Click Regenerate. The module’s dialog box opens showing the current option settings.
6. In the dialog box, choose the desired options. To get information about the options, click Help. Also, check the
About tab in IPexpress for links to technical notes and user guides. IP may come with additional information. As
the options change, the schematic diagram of the module changes to show the I/O and the device resources
the module will need.
7. To import the module into your project, if it’s not already there, select Import IPX to Diamond Project (not
available in stand-alone mode).
8. Click Generate.
9. Check the Generate Log tab to check for warnings and error messages.
10.Click Close.
The IPexpress package file (.ipx) supported by Diamond holds references to all of the elements of the generated IP
core required to support simulation, synthesis and implementation. The IP core may be included in a user's design
by importing the .ipx file to the associated Diamond project. To change the option settings of a module or IP that is
already in a design project, double-click the module’s .ipx file in the File List view. This opens IPexpress and the
module’s dialog box showing the current option settings. Then go to step 6 above.
Regenerating an IP Core in ispLEVER
To regenerate an IP core in ispLEVER:
1. In the IPexpress tool, choose Tools > Regenerate IP/Module.
2. In the Select a Parameter File dialog box, choose the Lattice Parameter Configuration (.lpc) file of the IP core
you wish to regenerate, and click Open.
3. The Select Target Core Version, Design Entry, and Device dialog box shows the current settings for the IP core
in the Source Value box. Make your new settings in the Target Value box.
4. If you want to generate a new set of files in a new location, set the location in the LPC Target File box. The base
of the .lpc file name will be the base of all the new file names. The LPC Target File must end with an .lpc extension.
5. Click Next. The IP core’s dialog box opens showing the current option settings.
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IP Core Generation
6. In the dialog box, choose desired options. To get information about the options, click Help. Also, check the
About tab in the IPexpress tool for links to technical notes and user guides. The IP core might come with additional information. As the options change, the schematic diagram of the IP core changes to show the I/O and
the device resources the IP core will need.
7. Click Generate.
8. Click the Generate Log tab to check for warnings and error messages.
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Chapter 5:
Support Resources
This chapter contains information about Lattice Technical Support, additional references, and document revision
history.
Lattice Technical Support
There are a number of ways to receive technical support.
Online Forums
The first place to look is Lattice Forums (http://www.latticesemi.com/support/forums.cfm). Lattice Forums contain a
wealth of knowledge and are actively monitored by Lattice Applications Engineers.
Telephone Support Hotline
Receive direct technical support for all Lattice products by calling Lattice Applications from 5:30 a.m. to 6 p.m.
Pacific Time.
• For USA & Canada: 1-800-LATTICE (528-8423)
• For other locations: +1 503 268 8001
In Asia, call Lattice Applications from 8:30 a.m. to 5:30 p.m. Beijing Time (CST), +0800 UTC. Chinese and English
language only.
• For Asia: +86 21 52989090
E-mail Support
• [email protected]
• [email protected]
Local Support
Contact your nearest Lattice Sales Office.
Internet
www.latticesemi.com
References
• IEEE Std. 802.3-2005, Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access
Method and Physical Layer Specifications, December 9, 2005.
• TN1084, LatticeSC SERDES Jitter
LatticeECP3
• HB1009, LatticeECP3 Family Handbook
LatticeECP2M
• HB1003, LatticeECP2M Family Handbook
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Support Resources
Revision History
Date
Document
Version
IP Core
Version
June 2007
01.0
1.0
Initial release.
June 2008
01.1
1.1
Title changed from “10Gb Ethernet Attachment Unit Interface (XAUI) IP Core
User’s Guide” to “XAUI IP Core User’s Guide”.
Change Summary
Updated Appendix for LatticeECP2M FPGAs.
June 2009
01.2
1.2
Added support for LatticeECP3 FPGA family.
November 2009
01.3
1.3
Updated utilization tables with ispLEVER 8.0.
June 2010
01.4
1.3
Divided document into chapters. Added table of contents.
Added Quick Facts table in Chapter 1, “Introduction.”
Added new content in Chapter 4, “IP Core Generation.”
September 2010
01.5
1.4
Added support for Diamond software throughout.
January 2012
01.6
1.6
IP Core I/O and Signal Definitions table – Added lines for rx_fifo_empty and
rx_fifo_full to the With Optional Rx Slip Buffer section. Added lines for
tx_fifo_empty and tx_fifo_full to the With Optional Tx Slip Buffer section.
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Appendix A:
Resource Utilization
This appendix gives resource utilization information for Lattice FPGAs using the XAUI IP core.
IPexpress is the Lattice IP configuration utility, and is included as a standard feature of the Diamond and ispLEVER
design tools. Details regarding the usage of IPexpress can be found in the IPexpress and Diamond or ispLEVER
help system. For more information on the Diamond or ispLEVER design tools, visit the Lattice web site at:
www.latticesemi.com/software.
LatticeECP2M FPGAs
Table A-1. Performance and Resource Utilization1
Configuration
Device
Utilization
TX Slip Buf- RX Slip Buffer
fer
MDIO
SLICEs
LUTs
Registers
EBRs
No
No
1351
1813
1545
0
No
No
Yes
1447
1951
1685
0
No
Yes
No
1632
2137
1989
2
No
No
1727
2264
2033
2
Yes
Yes
2160
2801
2641
4
LFE2M20E-6F256CES
No
LFE2M20E-6F256CES
LFE2M35E-6F484CES
LFE2M50E-6F672CES
Yes
LFE2M70E-6F900CES
Yes
1. Performance and utilization data are generated using Lattice Diamond 1.0 and Synplify Pro for Lattice D-2009.12L software. Performance
may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2M family.
Ordering Part Number
The Ordering Part Number (OPN) for all configurations of the XAUI IP core targeting LatticeECP2M devices is
XAUI-PM-U1.
Jitter and XAUI Compliance
The Lattice XAUI IP core for the LatticeECP2M device family offers compatibility with XAUI solutions and is functionally compliant to XAUI standard specification IEEE 802.3-2005. XAUI specification limits total jitter to 112ps
(0.35UI at 320 picoseconds/Unit Interval). LatticeECP2M exhibits transmit jitter within XAUI specification under typical conditions. Worst case transmit jitter considered over all temperature, voltage and process corners may fall outside XAUI specification. However, the LatticeECP2M based XAUI solution has been found to be compatible with
many systems. See TN1084, LatticeSC SERDES Jitter, for applicable jitter specification.
XAUI specification requires the receive side to have the ability to operate with 208ps (0.65UI) of jitter. The Lattice
solution for XAUI receive operates well within that specification.
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Resource Utilization
LatticeECP3 FPGAs
Table A-2. Performance and Resource Utilization1
Configuration
Device
Utilization
TX Slip Buf- RX Slip Buffer
fer
LFE3-35E-7FN484CES
MDIO
SLICEs
LUTs
Registers
EBRs
No
No
No
1194
1674
1498
0
LFE3-70E-7FN672CES
No
Yes
No
1529
2077
1980
2
LFE3-150E-7 FN1156CES
Yes
Yes
No
1880
2510
2467
4
1. Performance and utilization data are generated using Lattice Diamond 1.0 and Synplify Pro for Lattice D-2009.12L software. Performance
may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP3 family.
Ordering Part Number
The Ordering Part Number (OPN) for the XAUI IP core targeting LatticeECP3 devices is XAUI-E3-U1.
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