NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 117

• 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

Using the internal multiplexer
NS7520 DRAM address multiplexing
Figure 8: SRAM synchronous burst read cycle
The NS7520 can be configured to use an internal DRAM address multiplexer or an
external address multiplexer. A combination of the AMUX and AMUX2 bits in the
MMCR and the DMUXS bit in the Chip Select Base Address register determines which
multiplexer is used.
When configured to use the internal address multiplexer, the DRAM address signals
are provided on system bus address pins A13:A0.
ADDR[31:4]
ADDR[3:1]
A 32-bit DRAM peripheral connects to A13 through A2.
A 16-bit DRAM peripheral connects to A13 through A1.
An 8-bit DRAM peripheral connects to A13 through A0.
DATA
BCLK
R/W_
BE0_
BE1_
WE_
CS_
OE_
TA_
T1
000
T2
001
T2
010
T2
T2
011
w w w . d i g i e m b e d d e d . c o m
T2
100
101
T2
M e m o r y C o n t r o l l e r M o d u l e
T2
110
111
T2
1 0 5