NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 149

• 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

Table 50: DMA Control register bit definition
D30
D29:28
D27:26
Bits
W
R/W
R/W
Access
CA
BB
MODE
Mnemonic
0
0
0
Reset
Channel abort request
When set, causes the current DMA operation to complete
and the buffer to be closed. CA is not cleared automatically
after the requested abort is complete; firmware must clear
the bit after recognizing CAIP active.
Bus bandwidth
Determines how often the DMA channel can arbitrate for
access to the bus.
00
01
10
11
DMA operation mode
00
01
10
11
Identifies the data transfer mode. Each DMA channel can
be configured to operate in either fly-by or memory-to-
memory mode.
Description
w w w . d i g i e m b e d d e d . c o m
100% (no limit): The DMA channel can arbitrate
each time.
100% (no limit): The DMA channel can arbitrate
each time.
50%: The DMA channel can arbitrate 2 out of 4
times.
50%: The DMA channel can arbitrate 2 out of 4
times.
Fly-by write (peripheral-to-memory)
Fly-by read (memory-to-peripheral)
Memory-to-memory (source-to-destination)
Reserved
D M A M o d u l e
1 3 7