NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 141

• 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

Memory-to-memory operation
not touch this data; rather, it controls the flow of data through the BBus and provides
the external address for a single data transfer operation. Figure 16 provides a simple
representation of DMA fly-by mode:
Figure 16: DMA fly-by transfers
When configured for memory-to-memory (read-to-write) operations, the DMA
controller uses a temporary holding register between read and write operations. Two
memory cycles are executed — each read cycle is followed by a write cycle. Figure 17
provides a simple representation of DMA memory-to-memory mode:
Figure 17: DMA memory-to-memory transfer
Memory
Memory
Address
Data
Address
Data
Data
Peripheral
DMA
channel
DMA channel
Holding
register
DMA
acknow ledge
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