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21152 PCI-to-PCI Bridge Evaluation Board
User’s Guide 4-3
Secondary Bus Arbitration
Table 4-2 describes the operation of jumpers for external arbitration with PAL.
Table 4-2. External PAL Arbitration Jumper Positions
Jumper Position Description
J7 Top Selects the PAL as the source of secondary grants.
W4 Right Selects the board signal gt_out<4> (the external secondary grant to the
21152) to drive the 21152 s_req_l<0> input.
W1 Right Ties s_cfn_l high, which disables the21152 internal arbiter and causes the
following reconfigurations:
Signal s_gnt_l<0> becomes the secondary bus request.
Signal s_req_l<0> becomes the secondary bus grant.
The PAL parks the secondary bus at the 21152.