GIO Bus Varieties

• The GIO64 bus is a 64-bit, synchronous, multiplexed address-data bus that can run at speeds up to 33 MHz. It supports both 32- and 64-bit devices. GIO64 has two slightly different varieties: non-pipelined for internal system memory, and pipelined for graphics and pipelined GIO64 slot devices. The GIO64 bus is used in the Indigo2 and Indigo2 Maximum Impact systems.

• The GIO32-bis variety is a 32-bit version of the non-pipelined GIO64 bus or a GIO32 bus with pipelined control signals. This bus is found on R4000-based Indigo and Indy workstations.