Intel Arria 10 User Manual

2.8.1.1. TX PLL Selection for CPRI
Choose a transmitter PLL that fits your required data rate.
Table 202. TX PLL Supported Data Rates
ATX and fPLL support the clock bonding feature.
TX PLLs Supported Data Rate (Mbps)
ATX 614.4, 1228.8, 2457.6, 3072, 4915.2, 6144, 8110.08, 9830.4, 10137.6, 12165.12
fPLL 614.4, 1228.8, 2457.6, 3072, 4915.2, 6144, 8110.08, 9830.4, 10137.6, 12165.12
CMU 614.4, 1228.8, 2457.6, 3072, 4915.2, 6144, 8110.08, 9830.4, 10137.6
Note: • Channels that use the CMU PLL cannot be bonded. The CMU PLL that provides the
clock can only drive channels in the transceiver bank where it resides.
• Over-sampling is required to implement 614.4Mbps.
2.8.1.2. Auto-Negotiation
When auto-negotiation is required, the channels initialize at the highest supported
frequency and switch to successively lower data rates if frame synchronization is not
achieved. If your design requires auto-negotiation, choose a base data rate that
minimizes the number of PLLs required to generate the clocks required for data
transmission.
By selecting an appropriate base data rate, you can change data rates by changing the
local clock generation block (CGB) divider. If a single base data rate is not possible,
you can use an additional PLL to generate the required data rates.
Table 203. Recommended Base Data Rates and Clock Generation Blocks for Available
Data Rates
Data Rate (Mbps) Base Data Rate (Mbps) Local CGB Divider
1228.8 9830.4 8
2457.6 9830.4 4
3072.0 6144.0 2
4915.2 9830.4 2
6144.0 6144.0 1
9830.4 9830.4 1
2.8.2. Supported Features for CPRI
The CPRI protocol places stringent requirements on the amount of latency variation
that is permissible through a link that implements these protocols.
CPRI (Auto) and CPRI (Manual) transceiver configuration rules are both available for
CPRI designs. Both modes use the same functional blocks, but the configuration mode
of the word aligner is different between the Auto and Manual modes. In CPRI (Auto)
mode, the word aligner works in deterministic mode. In CPRI (Manual) mode, the
word aligner works in manual mode.
2. Implementing Protocols in Arria 10 Transceivers
UG-01143 | 2018.06.15
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10 Transceiver PHY User Guide
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Intel Arria 10 Specifications

General

Brand	Intel
Model	Arria 10
Category	Transceiver
Language	English