Intel 21152 manual Secondary Bus Arbitration, 1. Arbitration Jumpers, Viewed from Side, Position

Secondary Bus Arbitration

Figure 4-1. Arbitration Jumpers

Viewed from Side 1

E 3 _ Socket for

J 1 3

J 9

J 8

J 6

J3

J 5

	J 4
	J 1 1			J 2
J 1 0			J 1 2
		J 7		W 7
			W 5

Optional PAL to Control Secondary Bus External Arbitration

E3		J 1
W 4
				E4
W 1
	2 1 1		5 2

W 1 , W 4 , J 7 _ Secondary Bus
External/Internal Arbitration
Configurable Jumpers	L J - 0 5 1 2 7 . A I 4

Table 4-1describes the operation of internal arbitration jumpers.

Table 4-1.	Internal Arbitration Jumper Positions
	Jumper	Position	Description
	J7	Bottom	Selects the 21152 as the source of secondary grant signals.
	W4	Left	Selects the board signal sreq<0>_l (device 4 request signal) to drive the 21152
			s_req_l<0> input.
	W1	Left	Ties s_cfn_l low, which enables the 21152 internal arbiter. When the
			secondary PCI bus is idle, parking is at the 21152.

4-2 21152 PCI-to-PCI Bridge Evaluation Board User’s Guide