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NS7520 Features
2
NS7520 Hardware Reference, Rev. D 03/2006
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
– 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
13-channel DMA controller
– 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