F-Tile CPRI PHY Intel® FPGA IP User Guide

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ID 683284
Date 10/04/2021
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Document Table of Contents
Document Table of Contents x
1. About the F-Tile CPRI PHY Intel® FPGA IP Core 2. Getting Started 3. IP Parameter Settings 4. Functional Description 5. Interface Signals 6. IP Registers 7. F-Tile CPRI PHY Intel FPGA IP User Guide Archives 8. Document Revision History for the F-Tile CPRI PHY Intel FPGA IP User Guide
1. About the F-Tile CPRI PHY Intel® FPGA IP Core x
1.1. Supported Features 1.2. Overview 1.3. Device Family Support 1.4. Device Speed Grade Support 1.5. Resource Utilization 1.6. Release Information
2. Getting Started x
2.1. Installing and Licensing Intel® FPGA IP Cores 2.2. Specifying the IP Core Parameters and Options 2.3. Generated File Structure 2.4. IP Core Testbenches
2.1. Installing and Licensing Intel® FPGA IP Cores x
2.1.1. Intel® FPGA IP Evaluation Mode
2.2. Specifying the IP Core Parameters and Options x
2.2.1. Reference and System PLL Clock for your IP Design
4. Functional Description x
4.1. Reset Logic 4.2. Latency Measurement
4.2. Latency Measurement x
4.2.1. Deterministic Latency 4.2.2. Calculation for 64b/66b Datapath
5. Interface Signals x
5.1. Clock Signals 5.2. Reset Signals 5.3. TX MII Interface (64b/66b) 5.4. RX MII Interface (64b/66b) 5.5. Status Interface for 64b/66b Line Rate 5.6. TX Interface (8b/10b) 5.7. RX Interface (8b/10b) 5.8. Status Interface for 8b/10b Line Rate 5.9. Serial Interface 5.10. Reconfiguration Interfaces
5.1. Clock Signals x
5.1.1. Required Clock Frequencies
5.10. Reconfiguration Interfaces x
5.10.1. CPRI PHY Reconfiguration Interface 5.10.2. Ethernet Reconfiguration Interface 5.10.3. Transceiver Reconfiguration Interface
1. About the F-Tile CPRI PHY Intel® FPGA IP Core
2. Getting Started
3. IP Parameter Settings
4. Functional Description
5. Interface Signals
6. IP Registers
7. F-Tile CPRI PHY Intel FPGA IP User Guide Archives
8. Document Revision History for the F-Tile CPRI PHY Intel FPGA IP User Guide

5.1. Clock Signals

Each CPRI PHY channel has its own pair of datapath clocks and each transceiver has its own reference clock. The reconfiguration clock is shared.
Table 12.  CPRI PHY Clock Input Signals
Port name Width (Bits) Description
system_pll_clk_link 1 System PLL clock link port.
tx_pll_refclk_link 1 TX PLL reference clock link port.
rx_cdr_refclk_link 1 RX CDR reference clock link port.
i_reconfig_clk 1 Reconfiguration clock.
i_sampling_clk 1 Sampling clock for deterministic latency logic.
Table 13.  Clock Source SignalsLists the clock source ports for the CPRI core. The core provides locally generated PLL clocks and recovered clocks that can be used for the datapath.
Signal Name Width (Bits) I/O Direction Description
o_tx_clkout 1 Output System clock divided by 2.
o_tx_clkout2 1 Output Parallel TX clock:
  • For 64B/66B PCS: running at line rate/66.
  • For 8B/10B PCS: running at line rate/20.

Hold circuits using this clock in reset until o_tx_pll_lock is high.

o_rx_clkout 1 Output System clock divided by 2.
o_rx_clkout2 1 Output Parallel RX recovered clock:
  • For 64B/66B PCS: running at line rate/66.
  • For 8B/10B PCS: running at line rate/20.

Hold circuits using this clock in reset until o_rx_cdr_lock is high.

Table 14.  Clock Status SignalsLists the clock status ports for the CPRI core. Use these ports to hold the circuits that use clock sources from the core in reset until the PLLs driving the clocks are locked.
Signal Name Width (Bits) I/O Direction Description
o_tx_pll_lock 1 Output Indicates the TX PLL driving clock signals from the core is locked.

Intel® recommends not to use the o_tx_clkout or o_tx_clkout2 clocks until the o_tx_pll_lock clock is high.

o_rx_cdr_lock 1 Output Indicates that the recovered clocks are locked to data.

Intel® recommends not to use the o_rx_clkout or o_rx_clkout2 clocks until the o_rx_cdr_lock clock is high.

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