NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 76

• 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

6 4
G E N m o d u l e r e g i s t e r s
Table 24: System Control register bit definition
D24
D23:22
D21:20
D19
D18
Bits
R/W
R/W
R/W
N/A
R/W
Access
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
SWE
SWRI
SWT
Reserved
BME
Mnemonic
0
N/A
0
0
0
Reset
Software watchdog enable
Set to 1 to enable the watchdog timer circuit.The
watchdog timer can be configured, using SWRI, to
generate an interrupt or reset condition if and when the
watchdog timer expires. Once SWE is set to 1, only a
hardware reset sets the bit back to 0.
Software watchdog reset/interrupt select
Controls the action that occurs when the watchdog timer
expires:
00
01
10
11
Software watchdog timeout (in seconds)
Controls the timeout period for the watchdog timer. The
timeout period is a function of F
00
01
10
11
N/A
Bus monitor enable
0
1
Required to avoid a system lockup condition that can
occur when a bus master tries to address memory space
that is not decoded by any peripheral.
The bus monitor timer detects when a bus master is
accessing a peripheral and there is no transfer
acknowledge (TA_) response. When the bus monitor
timer expires, the current bus cycle is terminated
immediately and the current system bus master is issued a
data abort indicator.
Description
Disable bus monitor operation
Enable bus monitor operation
Software watchdog causes normal (IRQ) interrupt
Software watchdog causes fast (FIRQ) interrupt
Software watchdog causes reset
Reserved
2
2
2
2
20
22
24
25
/F
/F
/F
/F
XTALE
XTALE
XTALE
XTALE
XTALE
: