NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 137

• 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

The memory controller does a normal access to address
determine access timing. The memory controller then follows with 3 burst beats to
address offsets
The memory peripheral properly delivers the data at address offset
peripheral, however, has trouble providing the value at
with the BCYC burst timing and the memory peripheral needs an access cycle using
the WAIT timing, as the access address has crossed the memory peripheral’s page
boundary.
If a memory peripheral has a page size less than 64 bytes, then, the memory
peripheral can interface only with the NS7520, using burst cycles, when both the
WAIT and BCYC fields result in the same number of clock cycles for normal and burst
cycles.
You can use one of these combination:
WAIT
0
1
2
’h10
BCYC
1
2
3
,
’h14
, and
’h18
using the BCYC field to determine the access timing.
w w w . d i g i e m b e d d e d . c o m
M e m o r y C o n t r o l l e r M o d u l e
’h10
’hC
. The NS7520 is operating
using the WAIT field to
’hC
. The
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