NS9210B-0-I75 Datasheet, PDF (6/68 Pages) List of Unclassifed Manufacturers – Figure 1 shows the NS7520 modules. Dashed lines indicate shared pins

Key Features
Key Features
This table lists the key features of the NS7520.
CPU core
ARM7TDMI 32-bit RISC processor
32-bit internal bus
32-bit ARM 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
General purpose I/O pins
16 programmable GPIO interface pins
4 pins programmable with level-sensitive
interrupt
Integrated 10/100 Ethernet MAC
10/100 Mbps MII-based PHY interface
10 Mbps ENDEC interface
TP-PMD and fiber-PMD device support
Full-duplex and half-duplex modes
Optional 4B/5B coding
Station, broadcast, and multicast address
detection
512-byte transmit FIFO, 2 Kbyte receive FIFO
Intelligent receive-side buffer selection
Programmable Timers
Two independent timers (2μs–20.7 hours)
Watchdog timer (interrupt or reset on expiration)
Programmable bus monitor or timer
Operating frequency
36, 46, or 55 MHz internal clock operation from
18.432 MHz crystal
f_MAX = 36, 46, or 55 (grade–dependent)
System clock source by external quartz crystal
or crystal oscillator, or clock signal
Programmable PLL, which allows a range of
operating frequencies from 10 to f_MAX
Maximum operating frequency from external
clock or using PLL multiplication f_MAX
2
NS7520 Datasheet 03/2006