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21555 Non-Transparent PCI-to-PCI Bridge User Manual 19
Introduction
Figure 2 shows the 21555 microarchitecture.
Figure 2. 21555 Microarchitecture
A7418-01
Primary
Config
Registers
Device-
Specific
Config
Registers
CSR
Registers
Secondary
Config
Registers
JTAG
ROM
Interface
Control
Primary
Target
Control
Primary
Master
Control
Secondary
Target
Control
Secondary
Master
Control
Secondary
Bus
Arbiter
JTAG Signals
ROM Interface
Signals
Interrupt
Signals
Secondary Arbiter
Signals
Downstream Delayed Buffer
Downstream Posted Write Buffer
Upstream Read Data Buffer
Downstream Read Data Buffer
Upstream Posted Write Buffer
Upstream Delayed Buffer
rimary
PCI
Bus
Secondary
PCI
Bus
21555
21555