Document
GX3146
146 x 146 3.5Gb/s Crosspoint Switch with Trace Equalization and Output De-emphasis
Key Features
• 146 x 146 crosspoint switch architecture supporting broadcast and multi-cast modes
• Supports all data rates up to 3.5Gb/s • Low power consumption: 19.45W typical (all channels
active) • Sophisticated, dynamic on-chip power management
control • Independent, programmable input trace equalization
to reduce deterministic jitter (ISI) • Independent, programmable output de-emphasis for
driving long board traces • High-speed, video-optimized control for multi-format
applications • Built-in system test features with on-chip PRBS
generators and analyzers • 2.5V analog core voltage, 1.8V digital core voltage • Input and output voltages support either 1.2V, 1.8V or
2.5V CML • JTAG-controlled boundary scan • Selectable parallel/serial host interface • 50mm x 50mm BGA (2377 ball) • Operating temperature range: 0°C to +85°C • RoHS compliant
Applications
Large m x n cascaded routers/switch fabrics for:
• Professional broadcast applications • Enterprise and carrier applications • High-speed automated test equipment • 10GbE and InfiniBand networks
Description
The GX3146 is a low-power, high-speed 146 x 146 crosspoint switch, with robust signal conditioning circuits for driving and receiving high-speed signals through backplanes.
The device typically consumes 19.45W of power with all channels operational, and features sophisticated, dynamically scalable power management. Unused portions of the core are automatically turned off without affecting the operation of the remaining channels.
The signal conditioning features of the GX3146 include per-input programmable equalization and per-output programmable de-emphasis. The input equalizer removes ISI jitter—typically caused by PCB trace losses—by opening the input data eye in applications where long PCB traces are used. There are four settings available for the input equalizer, allowing flexibility in adjusting the equalization level on a per-input basis.
Output de-emphasis capability provides a boost of the high-frequency content of the output signal, such that the data eye remains open after passing through a long interconnect of PCB traces and connectors. There are four de-emphasis settings that can be enabled on a per-output basis.
Two integrated programmable pattern generators, and two pattern checkers are provided to assist in system test and configuration.
The pattern generators can each be routed to any output of the device without impacting the normal operation of any other channel. Any input can be routed to each of the pattern checkers.
The chip features eight independent strobe inputs, UPDATE_EN[7:0], which are used to determine the timing of the output updates. Any output can be linked to any strobe.
GX3146 146 x 146 3.5Gb/s Crosspoint Final Data Sheet Rev. 2 GENDOC-056075 March 2013
www.semtech.com
1 of 46 Proprietary & Confidential
TDI TCK TMS TDO
HOST_S/P
SDIN SCLK
RESET
S_CS SDOUT
P_DAT P_ADS [15:0]
P_ADD P_CS P_R/W [11:0]
JTAG and Boundary
Scan
SDI[0]/SDI[0]
Trace EQ
Input 0
Parallel/Serial Interfaces and General Registers
Input Configuration Latch
Active Configuration Latch
UPDATE_EN[7:0]
De-Emp
Output 0
SDO[0]/SDO[0]
SDI[287]/SDI[287]
Trace EQ
Input 143
EXT_PG0/EXT_PG0
Trace EQ
Input 144
EXT_PG1/EXT_PG1
Trace EQ
Input 145
146 x 146 Differential Cross-point Switch Matrix
Programmable Pattern Generator 1
Programmable Pattern Generator 0
Pattern Checker & Status Monitor 1
Pattern Checker & Status Monitor 0
De-Emp
Output 143
SDO[287]/SDO[287]
De-Emp
Output 144
MON0/MON0
De-Emp
Output 145
MON1/MON1
Reference Clock/Crystal Buffer
REF_CLK_IN
REF_CLK_OUT
GX3146 Functional Block Diagram
GX3146 146 x 146 3.5Gb/s Crosspoint Final Data Sheet Rev. 2 GENDOC-056075 March 2013
www.semtech.com
2 of 46 Proprietary & Confidential
Revision History
Version
2
ECO
011839
1 158396
0 157406 B 157284 A 156479
PCN
–
–
– – –
Date
Changes and/or Modifications
March 2013
October 2012
February 2012 November 2011
July 2011
Corrected second bullet in Section 4.7.1, and added a note in Section 4.4.
Included ESD Voltage Sensitivity in Table 2-1. Modifications to Table 4-18 and Section 4.12.2 to include Auto-Increment Timing and functionality. Updates to Appendix - Relevant Documentation with clear reference to correct documents. Converted document to Data Sheet.
Converted document to Preliminary Data Sheet. Updates throughout.
Corrections throughout the entire document.
New document.
Contents
1. Ball Out .............................................................................................................................................................5 1.1 Ball Assignment ................................................................................................................................5 1.2 Ball Descriptions ................................................................................................................