NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 103

• Manufacturer Part Number: NS7520B-1-C36
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-C36

• 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 36: MMCR bit definition
D20
D19
D18
D17
Bits
R/W
R/W
R/W
R/W
Access
AMUX
A[27]
A[26]
A25
Mnemonic
0
0
0
1
Reset
Enable external address multiplexing
0
1
Controls whether the NS7520 uses its internal
DRAM address multiplexer.
When set to 0, the NS7520 uses the internal DRAM
address multiplexer for all DRAM access cycles.
The DRAM RAS/CAS multiplexed address is
routed through the A13:A0 pins. See "NS7520
DRAM address multiplexing" on page 105 for more
information.
When set to 1, the NS7520 uses an external DRAM
multiplexer. The RAS/CAS address select signal is
routed out the PORTA2 signal. The external DRAM
RAS/CAS multiplexer uses the PORTA2 signals to
determine when to switch the address multiplexer
Enable A27 output
0
1
The bit settings determine how the NS7520 uses this
signal. See "A27 and A26 bit settings" on page 92
for more information.
Enable A26 output
0
1
The bit settings determine how the NS7520 uses this
signal. See "A27 and A26 bit settings" on page 92
for more information.
Enable A25 output
Always set to 0; used for address bit 25.
w w w . d i g i e m b e d d e d . c o m
Description
Disable external address multiplexing on
PORTA2 for all DRAM banks
Enable external address multiplexing on
PORTA2 for all DRAM banks
CS0OE_ is driven out the A27 pin
The A27 signal is driven out the A27 pin
CS0WE_ is driven out the A26 pin
The A26 signal is driven out the A26 pin.
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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