Emerson CC1000DM 사용자 설명서
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P M C / P C I I N T E R F A C E
PMC Module Installation
3-5
to…
1001
1001
PCI 6254 has highest priority
1010-1111
reserved
BPC:
Bus Parking Control
This controls the bus grant behavior during idle.
0000
This controls the bus grant behavior during idle.
0000
Last master granted is parked (default)
0001
Master #0 is parked
to…
1001
1001
Master #8 is parked
1010
PCI 6254 is parked
Others
Grant is deasserted
The secondary arbiter implements a programmable two-level rotating algorithm
whereby the priorities are re-evaluated at the start of each new transaction on the sec-
ondary PCI bus. From this point until the time the next transactions starts, the arbiter
will assert grants corresponding to the highest priority request asserted. The arbiter sup-
ports up to ten request/grant pairs. The request/grant assignments for the arbiter are
shown in the following table. For more detailed information regarding arbitration, refer
to the PLX PCI 6254 documentation listed in the Technical References
whereby the priorities are re-evaluated at the start of each new transaction on the sec-
ondary PCI bus. From this point until the time the next transactions starts, the arbiter
will assert grants corresponding to the highest priority request asserted. The arbiter sup-
ports up to ten request/grant pairs. The request/grant assignments for the arbiter are
shown in the following table. For more detailed information regarding arbitration, refer
to the PLX PCI 6254 documentation listed in the Technical References
CC1000dm
Request/Grant
Request/Grant
Local PCI Bus Device:
. . . . . . . . . . . . . . . . . . . . . . . . . .
0
PMC 1
1
PMC 2
2
reserved
3
reserved
4
PMC 1 Alternate Device
5
PMC 2 Alternate Device
6
reserved
7
reserved
8
reserved
9
PCI 6254
Table 3-5:
Request/Grant Assignments