Southbridge
 The XSB Southbridge | |
| Introduced | Late 2005 |
|---|---|
| Designed by | Microsoft SiS |
| Used In | Xbox 360 |
The Southbridge is the IO controller used in the Xbox 360. It contains interfaces for peripherals, audio output/decompression, drives, and memory units. It also contains the flash interface and System Management Controller. The later KSB variant also has the HANA's functionality built in.
The chip was developed by Microsoft and SiS.
Specifications
- Intel 8051 processor core (SMC)
- Nand flash interface
- PCI-Express x2 interface (for the BSB)
- Serial-ATA (SATA) interface
- USB1.1/2.0 interface
- IR interface
- Wireless game controller interface (for the RF board)
- WMA Pro audio hardware
Versions
XSB
The XSB is the initial version of the Southbridge and is used on the Xenon, Zephyr, and Falcon motherboards.
PSB
The PSB is the second version of the Southbridge and is used on the Jasper and Trinity motherboards.
KSB
The KSB is the final version of the Southbridge and is used on the Corona and Winchester motherboards. It includes the functionality previously provided by the HANA, such as clock generation and video encording.