| SB4100 Cable modem |
Motorola SB4100 surfboard
The CPU of the board uses BCM3345. The tool to debug the CPU is EJTAG (DMA).
Picture showing JTAG pins. Please install tall connector.![]() |
| Flash | One 2MB | 28F160C3T |
| Firmware | 2MB | $9FC00000-$9FDFFFFF |
| RAM | 16MB | $80000000-$81000000 |
To program sb4100 please visit http://www.usbjtag.com/jtagdevices/sb4200.php





