Part number : QCA9531
Qualcomm Atheros Main features
1. MIPS 24Kc processor, 64KB I-Cache, 32KB D-Cache, clocked at up to 680MHz
2. Support 16bit DDR1, DDR2 (up to 600MT / s)
3. Supports SPI Flash
4. Integrated 5-port Fast Ethernet switch
5. With a PCI Express 1.1 Root Complex interfaces
6. With a USB 2.0 interface
7. Internal integrated RF front-end
8. integrated 1.2V DCDC converter
QCA9531 internal functional block diagram
QCA9531 Datasheet
Reference Site:
https://wikidevi.com/wiki/Qualcomm_Atheros
https://forum.openwrt.org/viewtopic.php?id=66526