NS7520 Data Sheet
T
he Digi NS7520 is a high-performance, highly integrated, 32-bit system-on-a chip ASIC designed
for use in intelligent networked devices and Internet appliances. The NS7520 is based on the
standard architecture in the
NET+ARM™
family of devices.
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 32-bit RISC processor core with
a rich complement of support peripherals and memory
controllers for various types of memory (including Flash,
SDRAM, EEPROM, and others), programmable timers, a
13-channel DMA controller, an external bus expansion
module, and 16 general-purpose input/output (GPIO)
pins.
NET+ARM is the hardware foundation for the
NET+Works™
family of integrated hardware and software solutions for device networking. These
comprehensive platforms include drivers, popular operating systems, networking software,
development tools, APIs, and complete development boards.
Contents
NS7520 Overview........................................................................... 1
Key Features................................................................................ 2
Operating frequency ...................................................................... 3
Packaging and pinout ..................................................................... 4
Pinout detail tables ....................................................................... 6
System Bus interface............................................................. 6
Chip select controller........................................................... 10
Ethernet interface MAC......................................................... 11
“No connect” pins ............................................................... 13
General Purpose I/O ............................................................ 13
System clock and reset ......................................................... 15
System mode (test support) ................................................... 16
JTAG test ......................................................................... 16
Power supply ..................................................................... 17
NS7520 modules........................................................................... 18
CPU module ...................................................................... 18
GEN module ...................................................................... 18
System (SYS) module............................................................ 18
BBus module...................................................................... 19
Memory module (MEM).......................................................... 19
DMA controller ................................................................... 19
Ethernet controller.............................................................. 19
Serial controller ................................................................. 21
NS7520 bootstrap initialization ......................................................... 22
JTAG ............................................................................... 22
ARM Debug........................................................................ 22
DC characteristics and other operating specifications.............................. 23
Absolute maximum ratings..................................................... 24
Pad pullup and pulldown characteristics .................................... 24
AC characteristics ........................................................................ 25
AC electrical specifications .................................................... 25
Oscillator Characteristics................................................................ 27
Timing Diagrams .......................................................................... 28
Timing_Specifications........................................................... 28
Reset_timing ..................................................................... 29
SRAM timing ...................................................................... 30
SDRAM timing .................................................................... 40
FP DRAM timing .................................................................. 48
Ethernet timing .................................................................. 55
JTAG timing ...................................................................... 57
External DMA timing ............................................................ 59
Serial internal/external timing................................................ 61
GPIO timing....................................................................... 63
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