Technical datasheet for Loongson 3A4000 and 3B4000 quad-core processors, detailing interface structures, electrical specifications, and hardware design…
This document is the Version 1.0 datasheet for the Loongson 3A4000 and 3B4000 processors, which are micro-structure upgrades of the previous 3A3000/3B3000 series manufactured using a 28nm FD-SOI process. The chips feature four GS464 v high-performance processor cores with an operating frequency range of 1.5GHz to 2.0GHz. This manual is written in Chinese.
| Process Technology | 28nm FD-SOI process |
|---|---|
| Core Count | 4 cores per node |
| Operating Frequency | 1.5GHz - 2.0GHz |
| Cache Size | 8 MB split shared L3 Cache |
| DDR Controller | 2x 72-bit DDR4 controllers supporting DDR4-2400 |
| Floating Point Performance | 128 GFLOPS @ 2.0GHz |
The 3A4000 supports only one HT controller for IO bridge connection, while the 3B4000 supports dual controllers (HT0/HT1) and multi-processor interconnect structures.
Yes, but the corresponding RESETn signal must be pulled down to handle the unused channel correctly.