NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 43

• 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

Table 16: ARM performance
Working with ARM exceptions
Thumb mode
16-bit
16-bit
16-bit
16-bit
16-bit
ARM mode
32-bit
32-bit
32-bit
System bus
size
The ARM instruction set yields a 0.9 Dhrystone (2.1) rating MIPS/MHz of instruction
executions; the Thumb instruction set yields 0.75 Dhrystones MIPS/MHz. The MHz
rating reflects the rate at which instructions can be fetched from external flash
memory, as shown in this table:
Exceptions occur when the normal flow of a program is halted temporarily; for
example, to service an interrupt from a peripheral. Each ARM exception causes the
ARM processor to save some state information, then jump to a location in low
memory (referred to as the vector table; see "Exception vector table" on page 33).
Before an exception can be handled, the current processor state must be preserved
so the original program can resume when the handler routine has finished.
Thumb
Thumb
Thumb
Thumb
Thumb
ARM
ARM
ARM
Code style
25 MHz
25 MHz
36 MHz
46 MHz
55 MHz
36 MHz
46 MHz
55 MHz
RISC speed
25 MHz
25 MHz
36 MHz
46 MHz
55 MHz
36 MHz
46 MHz
55 MHz
System bus
speed
w w w . d i g i e m b e d d e d . c o m
1
0
3
4
5
3
4
5
Wait
states
120 ns
80 ns
125 ns
109 ns
108 ns
125 ns
109 ns
108 ns
Instruction
cycle time
W o r k i n g w i t h t h e C P U
N/A
N/A
N/A
N/A
N/A
6.8
8.6
10.4
Dhrystone
rating
3 1