NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 36

• 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

System clock and reset
2 4
P i n o u t d e t a i l t a b l e s a n d s i g n a l d e s c r i p t i o n s
Table 10: System clock pinout
Signal descriptions
The NS7520 has three clock domains:
The SYS module provides the NS7520 with these clocks, as well as system reset and
backup resources.
Table 11: Clock generation and reset signal description
XTALA1
XTALA2
PLLVDD (1.5V)
PLLVSS
RESET_
XTALA1
XTALA2
PLLVDD
PLLVSS
RESET_
Symbol
Mnemonic
System clock (SYSCLK)
Bit rate generation and programmable timer reference clock (XTALA1/2)
System bus clock (BCLK)
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
Oscillator input
Oscillator output
Clean PLL power
Connect directly to the
GND plane
System reset
Signal
K14
K12
L15
A10
L12
Pin
I
O
P
P
I
I/O
A standard parallel quartz crystal or crystal oscillator can
be attached to these pins to provide the main input clock to
the NS7520.
Power and ground for PLL circuit.
Resets the NS7520 hardware.
OD
Description
ARM/system oscillator circuit
PLL clean power
PLL return
System reset
Description