SB5101U Cable modem

This modem does not have a JTAG port, but we can access its flash via SPI.Use USB JTAG NT's new feature of SPI can do online programming the flash.

Board

Short the pins as in the picture allow you program the flash chip. Remove it when finish programming. The modem will not boot if ISP pins are connected.

Five pins need to connect to the SPI flash chip

Connection

JTAG connector of USB JTAG NT	Connector of u-Link NT	SPI U202
Pin 3(TDI)	Pin 10(IO0)	Pin 5(SI)
Pin 5(TDO)	Pin 8(IO1)	Pin 2(SO)
Pin 9(TCK)	Pin 6(IO2)	Pin 6(SCK)
Pin 11(RESET)	Pin 4(IO3)	Pin 1 (CS)
Pin 2(GND)	Pin 2(GND)	Pin 4(GND)
ISP	Short pin as indicated in the picture.

Definition is the same as SB5102.
For programming, use UJmodem and it is similar to SB5102


            

Lasted Updated:November 12 2020

Vists since Jan 4,2009