NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 140
NS7520B-1-I46
Manufacturer Part Number
NS7520B-1-I46
Description
IC ARM MICROPROCESSOR 177BGA
Manufacturer
Digi International
Series
NET+ARM®r
Specifications of NS7520B-1-I46
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
NS7520B-1-I46
Manufacturer:
Digi International
Quantity:
10 000
Part Number:
NS7520B-1-I46
Manufacturer:
NETARM
Quantity:
20 000
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Fly-by operation transfers
1 2 8
D M A m o d u l e
DMA module
Each DMA controller has a state machine and a block of static RAM referred to as
context RAM.
Figure 15: DMA controller block diagram
The DMA controller arbiter determines which channel the state machine currently is
operating.
There are two modes of fly-by operation:
When configured for fly-by operation, the DMA controller transfers data between one
of the NS7520 internal peripherals and a memory location. The DMA controller does
Channel
transfer
attributes
The context RAM contains the current state of each DMA channel.
The single state machine supports all DMA channels in parallel, by context
switching from channel to channel.
Read mode. Transfers data from memory to a peripheral device.
Write mode. Transfers data from a peripheral device to memory.
BBus
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
Bus interface
DMA channel
arbiter
DMA control
state machine
DMA
context RAM
128 x 32
Data
in
Data
out
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