Altera Triple Speed Ethernet MegaCore Function Bedienungsanleitung Seite 206
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HW
Reset
DescriptionR/WNameDword
Offset
0x0The drift of ToD adjusted periodically by adding
a correction value as configured in this register
space.
• Bits 0 to 15: Adjustment value in fractional
nanosecond (DRIFT_ADJUST_FNS). This value
is added into the current ToD during the
adjustment. The default value is 0.
• Bits 16 to 19: Adjustment value in nanosecond
(DRIFT_ADJUST_NS). This value is added into
the current ToD during the adjustment. The
default value is 0.
• Bits 20 to 32: Not used.
RWDriftAdjust0x1C
0x0The count of clock cycles for each ToD’s drift
adjustment to take effect.
• Bits 0 to 15: The number of clock cycles
(ADJUST_RATE). The ToD adjustment happens
once after every period in number of clock
cycles as indicated by this register space.
• Bits 16 to 32: Not used.
RWDriftAdjustRate0x20
Adjusting ToD Clock Drift
You can use the DriftAdjust and DriftAdjustRate registers to correct any drift in the ToD clock.
In the case of a ToD for 10G with period of 6.4ns, the nanosecond field is converted directly to PERIOD_NS
while the fractional nanosecond need to be multiplied with 216 or 65536 in order to convert to PERIOD_FNS.
This results in 0x6 PERIOD_NS and 0x6666.4 PERIOD_FNS.
PERIOD_NS only accepts 0x6666 and ignores 0x0000.4, which in turn would cause some inaccuracy in the
configured period. This inaccuracy causes the ToD to drift from the actual time as much as 953.67 ns after
a period of 1 second. You would notice that after every 5 cycles, 0x0000.4 accumulates to 0x0002. If the TOD
is able to add 0x0002 of fractional nanosecond into the ToD once after every period of 5 cycles, then it will
correct the drift.
Therefore, for the 10G case, DRIFT_ADJUST_NS is now configured to 0x0, DRIFT_ADJUST_FNS is configured
to 0x0002 and ADJUST_RATE is configured to 0x5.
Time-of-Day (ToD) Clock
Altera Corporation
Send Feedback
UG-01008
Adjusting ToD Clock Drift
C-6
2014.06.30
- User Guide 1
- Contents 2
- Altera Corporation 10
- About This MegaCore Function 10
- Send Feedback 10
- High-Level Block Diagrams 10
- Figure 1-2: Multi-port MAC 11
- 10/100/1000-Mbps 12
- Ethernet MAC 12
- Optical Platform 14
- Copper Platform 14
- Release Information 18
- DescriptionItem 19
- Using the Parameter Editor 24
- Design Walkthrough 25
- Simulate the System 27
- Programming an FPGA Device 27
- Generated Files 28
- DescriptionFile Name 29
- Quartus II Pin 29
- Assignment 29
- Parameter Settings 30
- Ethernet MAC Options 31
- FIFO Options 33
- Timestamp Options 34
- PCS/Transceiver Options 34
- ParameterValueName 35
- Functional Description 37
- MAC Architecture 38
- MAC Interfaces 39
- MAC Transmit Datapath 40
- IP Payload Re-alignment 41
- Address Insertion 41
- Frame Payload Padding 41
- CRC-32 Generation 41
- Interpacket Gap Insertion 42
- MAC Receive Datapath 43
- ValueHash Code Bit 44
- Frame Type Validation 45
- Payload Pad Removal 46
- CRC Checking 46
- Length Checking 46
- Frame Writing 47
- IP Payload Alignment 47
- FIFO Buffer Thresholds 48
- Receive Thresholds 49
- Transmit Thresholds 51
- Congestion and Flow Control 52
- Magic Packets 53
- MAC Local Loopback 54
- MAC Error Correction Code 55
- MAC Reset 55
- PHY Management (MDIO) 56
- MDIO Connection 57
- MDIO Frame Format 57
- Gigabit Ethernet 58
- Programmable 10/100 Ethernet 59
- Transmit Operation 62
- Receive Operation 63
- SGMII Converter 64
- Auto-Negotiation 65
- SGMII Auto-Negotiation 66
- Ten-bit Interface 68
- PHY Loopback 69
- PHY Power-Down 69
- POWERDOWN 70
- 1000BASE-X PCS 70
- IEEE 1588v2 Features 72
- Time of Day 73
- IEEE 1588v2 Receive Datapath 74
- IEEE 1588v2 Frame Format 74
- 0..1500/9600 Octets 75
- 4 Octets 75
- CRC4 Octets 76
- 0..1500/9600 Octets Payload 76
- MAC Header 77
- UDP Header 77
- IP Header 77
- PTP Header 77
- Software Requirements 78
- Base Addresses 80
- IEEE 1588v2 Feature PMA Delay 100
- UG-01008 101
- 2014.06.30 101
- DescriptionR/WNameBit(s) 103
- DescriptionR/WNameBit 105
- 1000BASE-X 106
- Register Initialization 110
- Configuration Register Space 111
- Interface Signals 116
- Clock and Reset Signal 117
- MAC Control Interface Signals 118
- MAC Status Signals 118
- MAC Receive Interface Signals 119
- DescriptionBit 120
- DescriptionI/OName 123
- MII/GMII/RGMII Signals 124
- PHY Management Signals 125
- ECC Status Signals 126
- TBI Interface Signals 131
- Status LED Control Signals 132
- SERDES Control Signals 132
- Related Information 133
- SectionInterface Signal 135
- 1.25 Gbps Serial Interface 138
- Transceiver Native PHY Signal 138
- DescriptionWidthI/OSignal 141
- 1000BASE-X/SGMII PCS Signals 149
- PCS Control Interface Signals 150
- PCS Reset Signals 150
- SGMII Status Signals 152
- Avalon-ST Receive Interface 155
- IEEE 1588v2 Timestamp 162
- Design Considerations 163
- Configurations(1) 164
- Sharing Transceiver Quads 169
- Timing Constraints 171
- Recommended Clock Frequency 173
- 50–100CLK 174
- 1000BASE-X/SGMII PCS only 174
- 125REF_CLK 174
- 125TBI_TX_CLK 174
- 125TBI_RX_CLK 174
- Testbench 175
- Testbench Verification 176
- Testbench Configuration 177
- Test Flow 177
- Simulation Model 178
- Simulation Model Files 179
- Driver Architecture 180
- PHY Speed Bits 181
- Speed (Mbps) 181
- Using Jumbo Frames 183
- API Functions 184
- Constants 189
- DescriptionValueConstant 190
- Ethernet Frame Format 192
- Pause Frame Format 194
- Description 195
- XON_GENXOFF_GEN 195
- Simulation Parameters 196
- DefaultDescriptionParameter 197
- Test Configuration Parameters 198
- Time-of-Day (ToD) Clock 201
- ToD Clock Parameter Setting 202
- ToD Clock 203
- DescriptionR/WNameDword 205
- Adjusting ToD Clock Drift 206
- ToD Synchronizer 207
- ToD Synchronizer Block 208
- 32/6364/31516/6364/63Settings 209
- DescriptionValueName 209
- ToD Synchronizer Signals 210
- Packet Classifier 212
- Packet Classifier Signals 213
- Additional Information 217
- Document Revision History 218
- ChangesVersionDate 219
- How to Contact Altera 223
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