Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Manual de usuario Pagina 133
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Addr Name Bit Description HW Reset
Value
Access
0x608 RETRANSMIT_
XOFF_
HOLDOFF_
QUANTA
[15:0] Specifies hold-off time from XOFF pause
frame transmission until retransmission, if
retransmission hold-off functionality is
enabled and pause request remains at the
value of 1. If your IP core implements
priority-based flow control with multiple
priority queues, this register provides access
to an internal table of retransmit-hold-off
times, one for each priority queue. Accesses
are indexed by the value in the TX_PAUSE_
QNUMBER register.
Unit is quanta. One quanta is 512 bit times,
which varies according to the datapath width
(256 or 512 depending on the IP core
variation) and the clk_txmac frequency.
Note that in the case of 100GbE IP cores, one
quanta is effectively one clk_txmac clock
cycle.
Pause request can be either of the TX_PAUSE_
REQUEST register pause request bit and the
pause_insert_tx signal.
0xFFFF
RW
0x609 TX_PAUSE_
QUANTA
[15:0] Specifies the pause time to be included in
XOFF frames.
If your IP core implements priority-based
flow control with multiple priority queues,
this register provides access to an internal
table of pause times, one for each priority
queue. Accesses are indexed by the value in
the TX_PAUSE_QNUMBER register.
Unit is quanta. One quanta is 512 bit times,
which varies according to the datapath width
(256 or 512 depending on the IP core
variation) and the clk_txmac frequency. In
100GbE IP cores, a quanta is effectively a
single clk_txmac clock cycle.
0xFFFF
RW
3-88
Pause Registers
UG-01172
2015.05.04
Altera Corporation
Functional Description
Send Feedback
- 101 Innovation Drive 1
- San Jose, CA 95134 1
- Contents 2
- Features 6
- Device Family Support 8
- IP Core Verification 9
- Simulation Environment 10
- Compilation Checking 10
- Hardware Testing 10
- Variation 11
- A B C D E F 11
- Parameter 11
- Release Information 14
- Getting Started 15
- OpenCore Plus IP Evaluation 17
- IP Core Parameters 19
- Parameter Type Range Default 23
- Parameter Description 23
- File Name Description 29
- Pin Assignments 32
- External TX MAC PLL 35
- File Names Description 38
- Initializing the IP Core 45
- Functional Description 46
- High Level System Overview 47
- Address Insertion 49
- Length/Type Field Processing 49
- Frame Padding 50
- Client Interface 51
- Data Bus Width (Bits) 51
- Three unusable words 57
- Order of Transmission 59
- RX CRC Forwarding 63
- Inter-Packet Gap 63
- Pause Ignore 63
- Control Frame Identification 64
- Name Direction Description 65
- Low Latency 100GbE CAUI–4 PHY 72
- External Transceiver PLL 72
- Pause Control Frame Filtering 76
- Statistics Counters Interface 79
- Name Signal 80
- Direction 80
- Description 80
- OctetOK Count Interface 82
- Transparent Clock Mode 85
- PTP Receive Functionality 87
- PTP Transmit Functionality 88
- 1588 PTP Interface Signals 90
- PTP Timestamp Formats 92
- PHY Status Interface 93
- Control and Status Interface 94
- Signal Name Description 97
- UG-01172 100
- 2015.05.04 100
- Related Information 108
- Software Interface: Registers 109
- PHY Registers 112
- LL 40GBASE-KR4 Registers 116
- Pause Registers 130
- TX Statistics Registers 137
- RX Statistics Registers 143
- 1588 PTP Registers 148
- Ethernet Glossary 150
- Term Definition 151
- Altera Corporation 153
- Send Feedback 153
- Arria 10 10GBASE-KR Registers 160
- 0x4D6 to 181
- MAC+PHY KR solution 181
- Subscribe 182
- Additional Information 187
- Date Compatible ACDS 188
- How to Contact Altera 194
- Typographic Conventions 195
- Visual Cue Meaning 196
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