Compaq AlphaServer DS20 Wartungshandbuch PDF herunterladen (Seite 45)

System Overview 1-35

Figure 1-18 is a block diagram of the TIG bus implemented through the TIG chip.

Three system functions are carried out on this bus.

Flash ROM

The flash ROM containing the diagnostics, fail-safe loader, and console firmware sits

on the TIG bus. (This is different from the AS 1200 where the flash ROM sat on the

C bus.) Still a good deal of logic has to function for the diagnostics to run.

Configuration Registers

Registers on the bus include interrupts, module information, and clock information.

Interrupts

System interrupts are passed through the TIG bus to the C-chip. The bus connects

directly to PCI slots and to onboard devices.

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Compaq AlphaServer DS20 Wartungshandbuch Seite 45