IDT Device Overview
Revision 1.5
Integrated Device Technology, Inc.
CPS-16/12/8 User Manual
1 - 4
July 10, 2012
Figure 1.2 CPS Interconnect
1.5 APPLICATION EXAMPLE: THE WIRELESS BASESTATION
Central switch based wireless processing
Figure 1.3 Application Overview
In a macro wireless station, a switch-based raw data combination and distribution architecture is widely
adopted. Switch based architecture provides high flexibility and high resource efficiency. The raw data from
the Radio Unit is distributed to one or more processing cards by unicast or multicast. Aggregating raw data
from processing cards to a buffer-less chain can be done by a fast non-blocking switch. It’s also suitable in
processing card since more and more processing is moved from RNC to Node B in the emerging applica-
tions.
The CPS provides direct support for backplane connections using the serial RapidIO standard.
The addition of an appropriate bridge (e.g., CPRI to sRIO) allows for further backplane flexibility,
accommodating designs based on a wide range of standards such as CPRI, OBSAI, GbE, or
PCIe.
CPS
SRIO Tx
Differential
x16
SRIO Rx
Differential
x16
I2C Interface
14 Signals
SERDES
Drive Bias
12 K ohm
RIO
Speed
Select
JTAG
Reset Signal
System
Clock
Test
Signals
(or x8, x12)
(or x8, x12)
RF Element
RF Element
CPU
FPGA
CPS-16
Serial RapidIO
CPS-8
Serial
RapidIO
DSP
DSP
CPU
FPGA
1
PROM
Central Switch Board(s)
I
2
C
PROM
I
2
C
Baseband Board(s)
DSP
1
2
… N