Dual 40-GbE/Octal 10-GbE QSFP+ XLPPI-to-XLAUI PHY

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Dual 40-Gigabit Ethernet (GbE) PPI-to-XLAUI (40-Gigabit electrical interface) PHY that incorporates an electronic dispersion compensation (EDC) equalizer supporting SR4, LR4 and copper CR4 line-card applications.
The BCM84784 is a multirate PHY targeted for QSFP+ modules. The BCM84784 is fully compliant with the 40-GbE SR4, LR4 and copper CR4 standards and also supports backward-compatible 8-by-10/1 GbE per lane, per the IEEE 802.3ae.


  • Each of the two 40G ports also has a 4 x 10G mode
  • Dual 40G XLPPI-to-XLAUI/quad-channel 10-GbE PHY developed in low-power 40 nm CMOS process technology
  • 10-GbE IEEE 1588 timestamping, as well as Y.1731 with Sync-E recovered clock outputs, in 4 x 10G mode
  • Supports 40G SR4, LR4 and copper CR4
  • Low latency design, ~ 50 ns


  • DSLAMs
  • Blade Servers
  • Enterprise LAN Switching
  • Line Cards
  • Routers
  • Top-of-Rack Switches

Lifecycle Status


Specification Value
Lifecycle Active
Distrib. Inventory No
Package 28nm, FPB4NGS, 29mmx29mm
PHY Type 40GE
I/O Controller
Bus Interface
Transfer Rates
External Memory Interfaces 8-bit and 16-bit Flash, w/ 6 Chip Selects SRAM, NVSRAM

NL/NLA12000 Family

NLA1200 Heterogeneous Knowledge-Based Processors with NetRoute™ Technology