NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 56
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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4 4
B B u s m a s t e r s a n d s l a v e s
BBus masters and slaves
Cycles and BBus arbitration
The BBus module consists of bus master and bus slave modules. The BBus state
machine allows each bus master to control the bus in a round-robin manner. If a bus
master does not require the bus resources when its turn comes around, that bus is
skipped until the next round-robin slot. Each potential bus master presents the BBus
with request and attribute signals. Once mastership is granted, the targeted device is
selected.
Table 19 illustrates bus master and slave modules.
Table 19: BBus masters and slaves
During a normal cycle, each bus master cycle is allowed only one read/write cycle if
another bus master is waiting. There are two exceptions to this rule: burst
transactions and read-modify-write transactions.
In a burst transaction, the master can perform more than one read or write cycle. In
a read-modify-write transaction, the bus master performs one read and write cycle to
the same location.
CPU module
BUS module
EFE module
DMA module
GEN module
MEM module
SER module
Module
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
Y
Y
Y
Master
Y
Y
Y
Y
Y
Y
Y
Slave
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