NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 101

• 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

Memory Module Configuration register
Note:
To determine whether a BBus address is associated with a peripheral chip select,
apply the following Boolean equation (chip select decode is TRUE when):
(({MASK,000} & 32-bit logical address) = = ({BASE,000} & {MASK,000}))
The NS7520 supports only 28 address bits. Each chip select is limited to 256 Mbytes.
Memory Space
The MASK field can alias a memory location in different areas. The memory space
associated with an individual chip select does not have to be continuous. Using the
MASK field, you can set gaps in a single chip select range, essentially assigning the
same chip select to different portions of the memory map.
Example
A 16 Mbyte device can be addressed in four different 64 Mbyte address locations by
using a MASK value of
locations:
Address: FFC0 0000
The Memory Module Configuration register (MMCR) defines basic MEM module
configurations.
A 0 in the MASK field indicates that the associated address is to be ignored
in the address decoding process.
{MASK,000}
{BASE,000}
&
==
BASE + ’h00000000
BASE + ’h04000000
BASE + ’h08000000
BASE + ‘h0C000000
is the logical AND function.
is the equal to operator.
When accessing a static memory device, the maximum value of the base
address is
is the BASE field concatenated with three nibbles of 0.
is the MASK field concatenated with three nibbles of 0.
0x03000000
’hF3000
. The peripheral is addressable at these address
.
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M e m o r y C o n t r o l l e r M o d u l e
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