NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 77

• 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

Table 24: System Control register bit definition
D17:16
D15
D14
D13
Bits
R/W
R/W
R/W
N/A
Access
BMT
USER
BUSER
Reserved
Mnemonic
0
0
~ADDR[
26]
N/A
Reset
Bus monitor timer
Controls the timeout period for the bus monitor timer:
00
01
10
11
The BMT field generally is set to its maximum value, but
can be set to a lower value to minimize the latency when
issuing a data abort signal. The BMT field needs to be set
to a value that is larger than the anticipated longest access
time for all peripherals.
Enable access to internal chip registers in CPU user
mode
Controls whether applications operating in ARM user
mode (rather than supervisor mode) can access internal
registers within the NS7520.
Enable ARM CPU
Must be set to 0.
When reset, BUSER defaults to the value defined by
ADDR26 (see "NS7520 bootstrap initialization" on page
59).
N/A
Description
w w w . d i g i e m b e d d e d . c o m
If set to 0, and an application, operating in ARM user
mode tries to access (read or write) an internal
NS7520 register, the application receives a data
abort. This causes a transfer in control to the data
abort handler.
internal registers.
If set to 1, any application can access the NS7520
128 BCLKs (bus clocks)
64 BCLKS
32 BCLKS
16 BCLKS
G E N M o d u l e
6 5