NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 6

• 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

vi
C h a p t e r 4 : B B u s M o d u l e
C h a p t e r 5 : S Y S M o d u l e
C h a p t e r 6 : G E N M o d u l e
Hardware Interrupts.................................................................... 39
BBus masters and slaves ............................................................... 44
Cycles and BBus arbitration ........................................................... 44
Address decoding ....................................................................... 45
Signal description....................................................................... 48
JTAG support ............................................................................ 48
ARM debug ............................................................................... 48
System clock generation (NS7520 clock module) .................................. 49
Using the external oscillator.......................................................... 50
Using the PLL circuit ................................................................... 51
Setting the PLL frequency............................................................. 54
Reset circuit sources ................................................................... 59
NS7520 bootstrap initialization....................................................... 59
Module configuration................................................................... 62
GEN module hardware initialization ................................................. 62
GEN module registers .................................................................. 63
Exception vector table.......................................................... 33
Detail of ARM exceptions ....................................................... 34
Entering and exiting an exception (software action) ...................... 37
FIRQ and IRQ lines ............................................................... 39
Interrupt controller.............................................................. 39
Interrupt sources................................................................. 40
External oscillator vs. internal PLL circuit................................... 49
NS7520 clock module block diagram.......................................... 50
External oscillator mode hardware configuration .......................... 50
PLL mode hardware configuration ............................................ 52
PLL Settings register: Setting the PLL frequency on bootup .............. 54
PLL Control register: Setting the PLL frequency with the PLL Control
register ............................................................................ 57
...................................................................................................47
..................................................................................................61
................................................................................................43