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System Control Module
met. See "Arbiter configuration examples" on page 258 for information about
configuring the AHB arbiter.
The NS9750 high-speed bus system is split into two subsystems:
High-speed peripheral subsystem: Connects all high-speed peripheral
devices to a port on the external memory controller.
CPU subsystem: Connects the CPU directly to a second port on the external
memory controller.
Figure 60 shows an overview of the NS9750 high-speed bus architecture.
Figure 60: NS9750 bus architecture
The NS9750 high-speed bus contains two arbiters: one for the ARM926 (CPU) and one
for the main bus.
CPU arbiter. Splits the bandwidth 50–50 between the data and instruction
interfaces. If the CPU access is to external memory, no further arbitration is
necessary; the CPU has immediate access to external memory through slave
port 0 on the memory controller. If CPU access is to one of the peripherals
on the main bus, however, the main arbiter will arbitrate the access.
ARM
926
I D
Ethernet
MAC
Slv
PCI
Slv
Bbus
Slv
LCD
Slv
Memory
Controller
Reg
Slv
Slv 1
Ethernet
MAC
Tx Rx
PCI
Mst
Bbus
Mst
LCD
Mst
Master Write Mux
Slave Read Mux
PCI
Arb
Slv
SCM
Slv
Slv 0