Ns7520 Features; Key Features And Operating Modes Of The Major Ns7520 Modules - Digi NS7520B-1-C36 Hardware Reference Manual

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NS7520 Features

The NS7520 can support most any networking scenario, and includes a 10/100 BaseT
Ethernet MAC and two independent serial ports (each of which can run in UART or SPI
mode).
The CPU is an ARM7TDMI (ARM7) 32-bit RISC processor core with a rich complement of
support peripherals and memory controllers, including:
Glueless connection to different types of memory; for example, flash,
SDRAM, EEPROM, and others.
Programmable timers
13-channel DMA controller
External bus expansion module
16 general-purpose I/O (GPIO) pins

Key features and operating modes of the major NS7520 modules

CPU core
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13-channel DMA controller
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ARM7 32-bit RISC processor
32-bit internal bus
32-bit ARM mode and 16-bit Thumb mode
15 general-purpose 32-bit registers
32-bit program counter (PC) and status register
Five supervisor modes, one user mode
Two channels dedicated to Ethernet transmit and receive
Four channels dedicated to two serial modules' transmit and receive
Four channels for external peripherals (only two channels — either 3 and 5
or 4 and 6 — can be configured at one time)
Three channels available for memory-to-memory transfers
Flexible buffer management
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