NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 99

• 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

MEM module configuration
The MEM module is configured as shown in Table 35. Each chip select contains an
identical set of three registers that appear on a boundary of
Each register is 32 bits unless otherwise noted.
Chip select configured for SRAM. The MEM module controls the CS[4:0]_,
OE_, and WE_ signals. The address from the current bus master is driven
directly to A[27:0].
Chip select configured for FP or EDO DRAM. The MEM module can be
programmed to drive a multiplexed address on A[13:0], and drives the
remainder of the address from the current bus master to A[27:14].
–
–
–
Chip select configured for SDRAM. The MEM module can be programmed to
drive a multiplexed address on A[13:0], and drives the remainder of the
address from the current bus master to A[27:14].
–
–
–
–
–
SDRAMs require the DQM function. The BE[3:0]_ signals provides the DQM
function.
The CS[4:0]_ signals provide the RAS_ function.
The CAS_ signals provide the CAS_ function.
The OE_ and WE_ signals provide the output and write enables,
respectively.
The CS[4:0]_ signals provide the CS[4:0]_ function.
The CAS3_ signal provides the RAS_ function.
The CAS2 function provides the CAS_ function.
The CAS1_ signal provides the WE_ function.
The CAS0_ signal provides the A10/AP multiplexed signal. The A10/AP
multiplexes between the A10 pin for the DRAM and the auto precharge
indicator. The CAS0_ signal must always be connected to the SDRAM A10
pin.
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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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