NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 27

• 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

Table 2: System bus interface pinout
Signal descriptions
Table 3: System bus interface signal description
BG_
BUSY_
BCLK
ADDR[27:0]
DATA[31:0]
TS_
BE_
TA_
Symbol
Mnemonic
Data bus
Transfer start
Byte enable
Transfer acknowledge
Bus clock
Address bus
Signal
C7
B7
Pin
NO CONNECT
NO CONNECT
I/O
Provides the bus clock. All system bus interface signals are
referenced to the BCLK signal.
Identifies the address of the peripheral being addressed by
the current bus master. The address bus is bi-directional.
Provides the data transfer path between the NS7520 and
external peripheral devices. The data bus is bi-directional.
Recommendation: Less than x32 (S)DRAM/SRAM
memory configurations. Unconnected data bus pins will
float during memory read cycles. Floating inputs can be a
source of wasted power.
For other than x32 DRAM/SRAM configurations, the
unused data bus signals should be pulled up.
NO CONNECT
Identifies which 8-bit bytes of the 32-bit data bus are active
during any given system bus memory cycle. The BE_
signals are active low and
bi-directional.
Indicates the end of the current system bus memory cycle.
This signal is driven to 1 prior to
tri-stating its driver.
TA_ is bi-directional.
Description
OD
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Description
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