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PPM7832 BRICTM 2
Two Port Baseband Radio Interface Controller
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Features
PRODUCT OVERVIEW
The PM7832 Two Port Baseband to Radio Interface Controller (BRICTM 2)
is a full-featured 2-port termination device that fully supports the CPRI
specification for wireless base station interconnection. The BRIC
provides integrated rate-adaptive SERDES links along with CPRI
framing, mapping, switching, combining, and integrated clock jitter
attenuation functions. When used in conjunction with the 6-port PM7830 BRIC, the BRIC and
BRIC 2 can be used to flexibly create scalable CPRI-compliant
distributed architectures. PRODUCT HIGHLIGHTS
- Operates in all of the following Baseband-to-RF interconnect
topologies:
- Local interconnect using a central combiner/distributor topology.
- Local interconnect using a full mesh topology.
- Remote interconnect using a point-to-point (P2P) star topology.
- Remote interconnect using a tree and branch topology.
- Remote interconnect using a chain topology.
- Remote interconnect using a ring topology.
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- Supports up to 2 serial channels running independently at CPRI line
rates from 614.4 Mbit/s to 2457.6 Mbit/s with 8B/10B-encoded
data.
- In CPRI RE mode, recovers high quality 61.44 MHz master reference
timing from a received serial line interface.
- Recovered master reference timing complies with CPRI RE
frequency synchronization specification.
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- Requires only an external crystal to provide a complete
synchronized timing solution.
- Supports up to 2 parallel Radio Bus Interfaces (RBIs) for output of
user data.
- Supports CPRI start-up sequence and link-rate auto-negotiation for
both REC and RE operating modes.
- Supports traffic switching at the CPRI Antenna Carrier (AxC) level.
- Supports IQ summing.
- Supports multiplexing and termination of control and
synchronization sub-channels:
- Up to 6 Ethernet Fast C&M channels.
- Up to 6 HDLC Slow C&M channels.
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- Measures round-trip delay on each CPRI link with an accuracy of
±1 ns:
- Provides programmable delay insertion to meet CPRI delay
calibration requirements.
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- Supports serial line protection switching.
- Supports configuration, control, monitoring and test capability on a
per-channel basis.
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INTERFACES
- Line side high-speed serial outputs supporting simultaneous
multiple CPRI line rates using a single reference clock input.
- System side parallel Radio Bus Interface (RBI) supporting parallel
output of either:
- Direct CPRI frame payload.
- Unmapped IQ data to/from CPRI frame payload.
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- CPRI-compliant de-jittered RE clock output for driving all low-jitter RE
inputs.
- 2-port RMII/SMII/MII Ethernet interface for accessing Fast C&M
channels.
- Multi-channel HDLC serial interface for accessing Slow C&M
channels across all links.
- 16-bit microprocessor interface compatible with both Intel-like and
Freescale-like processors.
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BENEFITS
- Industry's lowest cost and highest integration solution targeted at
remote radio head (RRH) designs.
- Provides all necessary functions for implementing CPRI-based
Chain, Ring, Point-to-Point architectures, and more.
- Eliminates need for external PLL circuit when recovering RE timing
source.
- Software-compatible BRIC and BRIC 2 allow complete CPRI solutions
to be realized quickly and expanded as needed.
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- Enables application-specific performance monitoring & OAM
functions using in-band Ethernet/HDLC control & management subchannels.
- Applicable for UMTS, CDMA, WiMAX solutions and beyond.
- Industry's most complete and low-risk solution with reuse from
PM8358 QuadPHY 10GX SerDes and PM7831 BRIC FP CPRI Framer.
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Applications
Two of the many possible architectural implementations using the
BRIC and BRIC 2 are shown below:
- CPRI-based Remote Radio Head (RRH) design where the BRIC 2
implements the SERDES, CPRI Framing/Mapping, and clock jitter
attenuation functions.
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- Chain-based CPRI architecture where the BRIC 2 is used to create
one or more chains of remotely located RE devices.
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PM7832 BRIC 2 Two Port Baseband Radio Interface Controller Product Brief [116 KB] PMC-2051673 
Optimizing Pre-emphasis and Receive Equalization for Backplanes [493 kB] PMC-2021098