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1da177e4 LT |
1 | |
2 | The SGI Visual Workstations (models 320 and 540) are based around | |
3 | the Cobalt, Lithium, and Arsenic ASICs. The Cobalt ASIC is the | |
4 | main system ASIC which interfaces the 1-4 IA32 cpus, the memory | |
5 | system, and the I/O system in the Lithium ASIC. The Cobalt ASIC | |
6 | also contains the 3D gfx rendering engine which renders to main | |
7 | system memory -- part of which is used as the frame buffer which | |
8 | is DMA'ed to a video connector using the Arsenic ASIC. A PIIX4 | |
9 | chip and NS87307 are used to provide legacy device support (IDE, | |
10 | serial, floppy, and parallel). | |
11 | ||
12 | The Visual Workstation chipset largely conforms to the PC architecture | |
13 | with some notable exceptions such as interrupt handling. |