NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 162

• 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

1 5 0
E t h e r n e t f r o n t - e n d ( E F E )
Ethernet front-end (EFE)
Figure 21 shows a high-level block diagram of the EFE module. The EFE module
provides the FIFO handling interface between the NS7520 BBus and MAC modules.
Figure 21: Ethernet front-end module
Basic features in the EFE include:
BBu
Control and status registers for MAC, transmitter, and receiver
512-byte transmit FIFO
2048-byte local receive FIFO
DMA interface logic
s
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
MAC TX interface
transmit
local
byte
512
FIF
O
MAC RX interface
receive
local
byte
FIF
2K
O
RX