SOYO P55C, P54C manual JP16 PCI Bus Asynchronous/Synchronous Jumper

Hardware Setup 7

JP16: PCI Bus Asynchronous/Synchronous Jumper

Asynchronous and synchronous (default) PCI bus frequency settings are available.

PCI Bus Setting JP16

1

Asychronous

1

Synchronous

Divides the host bus by 2 to get the Asynchronous setting, and sets the PCI bus on 32MHz to get the synchronous setting. Set JP16 to Synchronous mode when the system is unstable.

Host Bus	PCI Bus Frequency	PCI Bus Frequency
(CPU Bus)	(Synchronous)	(Asynchronous)
50 MHz*	25 MHz	32 MHz
55 MHz*	27.5 MHz	32 MHz
60 MHz	30 MHz	32 MHz
66 MHz	33.3 MHz	32 MHz
75 MHz**	37.5 MHz	32 MHz

*: Do not use Asynchronous setting when the host bus frequency is 50MHz or 55MHz.

**: Do not use Synchronous setting when the host bus frequency is 75 MHz.