NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 123

• 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

FP/EDO DRAM burst cycles
SDRAM
The DRAM controller supports both read and write burst cycles. A DRAM Burst cycle
must operate with a minimum of one wait state for the first cycle and a minimum of
two BCLK cycles in subsequent cycles.
Figure 10: FP DRAM burst cycles
When bursting at full bus speed with EDO, write timing is controlled by a combination
of BCYC and WAIT; otherwise, BCYC controls the length of subsequent burst cycles.
(See "Chip Select Option Register A," beginning on page 97, for information about the
BCYC and WAIT fields.)
The DMODE field in the Chip Select Base Address register configures a chip select for
SDRAM (synchronous DRAM).
Important:
DATA Read
DATA Write
ADDR
BCLK
RAS_
CAS_
TEA_
WE_
OE_
TA_
The NS7520 cannot perform 16-bit burst operations from an x32 SDRAM.
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TW
T2
TW
T2
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T2
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T2
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