Delayed Transaction:
Delayed Transaction
Options : Enabled, Disabled
This feature is used to meet the latency of PCI cycles to and from the ISA bus. The ISA bus is much, much slower than the PCI bus. Thus, PCI cycles to and from the ISA bus take a longer time to complete and this slows the PCI bus down.
However, enabling Delayed Transaction enables the chipset's embedded 32-bit posted write buffer to support delayed transaction cycles. This means that transactions to and from the ISA bus are buffered and the PCI bus can be freed to perform other transactions while the ISA transaction is underway.
This option should be enabled for better performance and to meet PCI 2.1 specifications. Disable it only if your PCI cards cannot work properly or if you are using an ISA card that is not PCI 2.1 compliant.
Zolang je geen ISA-bus hebt (zoals ik) kun je deze functie dus gerust aan- of uitzetten, maakt geen ruk uit. Heb je wel een ISA-bus dan kun je de functie het beste aanzetten.
Passive Release
Options : Enabled, Disabled
Because the ISA bus is so much slower than the PCI bus, any device engaging the ISA bus normally renders the PCI bus inaccessible to the CPU. But with Passive Release enabled, CPU-to-PCI bus accesses are allowed via passive release of the PCI bus. It does so with the use of the chipset's embedded 32-bit posted write buffer.
The write buffer stores the PCI writes from the CPU when the ISA bus is being accessed. The data is then written to the PCI bus by passive release. Therefore, the processor can still access the PCI bus even when the ISA bus is being accessed.
Otherwise, the arbiter will only accept another PCI master access to local DRAM. In other words, only another PCI bus master can access the PCI bus, not the processor. This feature is used to meet the latency of the ISA bus master, which is much longer than that of the PCI bus master.
Enable Passive Release for optimal performance. Disable it only if you are facing problems with your ISA cards.
Zelfde verhaal... als je geen ISA-bus hebt heeft deze functie geen nut.