NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 57

• Manufacturer Part Number: NS7520B-1-C36
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-C36

• Applications: Network Processor
• Core Processor: ARM7
• Program Memory Type: External Program Memory
• Controller Series: -
• Ram Size: External
• Interface: EBI/EMI, Ethernet, DMA, SPI, UART
• Number Of I /o: 16
• Voltage - Supply: 1.4 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 177-LFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Address decoding
The CPU address map is divided to allow access to the internal modules and external
resources routed through the internal peripherals. Each slave module is given a small
portion of the system address map for configuration and status.
Table 20 defines how the address is decoded to allow access to slave modules or the
BUS module (external resources).
Table 20: BBus address decoding
All resources defined in this manner are addressed using the upper memory
addresses. Each internal module is given 1 Mbyte of address space for its own internal
decoding. Each module defines its own specific register map.
The BBus module does not allow access to any internal registers unless the
signal is active, which indicates that firmware is executing in supervisor mode. The
System Control register provides an override signal (the USER bit in the GEN module
System Control register) to allow access to internal registers in user mode.
0000 0000–FF6F FFFF
FF80 0000–FF8F FFFF
FF90 0000–FF9F FFFF
FFB0 0000–FFBF FFFF
FFC0 0000–FFCF FFFF
FFD0 0000–FFDF FFFF
Address range
BUS module and external memory
EFE module
DMA module
GEN module
MEM module
SER module
Module
w w w . d i g i e m b e d d e d . c o m
B B u s M o d u l e
CPU_SUPV
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