Motorola MVME2400 Series Service Manual Page 130

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2-72 Computer Group Literature Center Web Site
Hawk PCI Host Bridge & Multi-Processor Interrupt Controller
2
FSWx Flatten Single Write. This field is used by the PPC
Arbiter to control how bus pipelining will be affected after
all single beat write cycles. The encoding of this field is
shown in the table below.
PRI Priority. If set, the PPC Arbiter will impose a rotating
between CPU0 grants. If cleared, a fixed priority will be
established between CPU0 and CPU1 grants, with CPU0
having a higher priority than CPU1.
PRKx Parking. This field determines how the PPC Arbiter will
implement CPU parking. The encoding of this field is
shown in the table below.
ENA Enable. This read only bit indicates the enabled state of
the PPC Arbiter. If set, the PPC Arbiter is enabled and is
acting as the system arbiter. If cleared, the PPC Arbiter is
disabled and external logic is implementing the system
arbiter. Refer to the section titled PHB Hardware
Configuration for more information on how this bit gets
set.
FBR/FSR/FBW/FSW Effects on Bus Pipelining
00 None
01 None
10 Flatten always
11 Flatten if switching masters
PRK CPU Parking
00 None
01 Park on last CPU
10 Park always on CPU0
11 Park always on CPU1
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