User`s guide

The 21071-DA provides all controls and interfaces to the PCI and sysBus and
contains the following components and functions:
• sysBus interface state machine
• sysBus address decoder and translator
• epiBus arbitration and control
• PCI interface, state machines, and parity generation
• PCI address decoder and translator
Figure 3–3 Basic I/O Subsystem Address and Data Paths
LJ03945A.AI
21071-BA0
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memData <127:0>
sysData <127:0> Check <21,14,7,0>
memPar <3:0>
21071-BA1 21071-BA2 21071-BA3
Memory
DRAMs
CPU
Cache
21071-CA
Buffer
21071-DA
PCI Bus ad<31:0>
(Address and data
lines multiplexed)
Request and Grant Control
sysAdr <33:5>
Memory Address and Control
epiData <31:0>
Functional Description 3–5