JAJSQ97J may 2009 – january 2021 XIO2001
PRODUCTION DATA
The arbiter control register controls the bridge internal arbiter. The arbitration scheme used is a two-tier rotational arbitration. The bridge is the only secondary bus master that defaults to the higher priority arbitration tier. See Table 8-53 for a complete description of the register contents.
PCI register offset: | DCh | |
Register type: | Read/Write | |
Default value: | 40h |
BIT NUMBER | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
RESET STATE | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
BIT | FIELD NAME | ACCESS | DESCRIPTION | |
---|---|---|---|---|
7(1) | PARK | RW | Bus parking mode. This bit determines where the internal arbiter parks the secondary bus. When this bit is set, the arbiter parks the secondary bus on the bridge. When this bit is cleared, the arbiter parks the bus on the last device mastering the secondary bus. 0 = Park the secondary bus on the last secondary bus master (default) 1 = Park the secondary bus on the bridge | |
6(1) | BRIDGE_TIER_SEL | RW | Bridge tier select. This bit determines in which tier the bridge is placed in the arbitration scheme.
0 = Lowest priority tier 1 = Highest priority tier (default) | |
5(1) | TIER_SEL5 | RW | GNT5 tier select. This bit determines in which tier GNT5 is placed in the arbitration scheme. 0 = Lowest priority tier (default) 1 = Highest priority tier | |
4(1) | TIER_SEL4 | RW | GNT4 tier select. This bit determines in which tier GNT4 is placed in the arbitration scheme. 0 = Lowest priority tier (default) 1 = Highest priority tier | |
3(1) | TIER_SEL3 | RW | GNT3 tier select. This bit determines in which tier GNT3 is placed in the arbitration scheme. 0 = Lowest priority tier (default) 1 = Highest priority tier | |
2(1) | TIER_SEL2 | RW | GNT2 tier select. This bit determines in which tier GNT2 is placed in the arbitration scheme. 0 = Lowest priority tier (default) 1 = Highest priority tier | |
1(1) | TIER_SEL1 | RW | GNT1 tier select. This bit determines in which tier GNT1 is placed in the arbitration scheme. 0 = Lowest priority tier (default) 1 = Highest priority tier | |
0(1) | TIER_SEL0 | RW | GNT0 tier select. This bit determines in which tier GNT0 is placed in the arbitration scheme. 0 = Lowest priority tier (default) 1 = Highest priority tier |