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Whilst Browsing the web found some jtag information on what I believe to be the netgear Cable Modems (superhub).
NETGEAR CG3100D:
This modem DOCSIS 3.0 modem and has BCM3380 CPU.
It employs 8M SPI flash.
Use USB JTAG NT's can program the flash ISP.
The ISP pin uses pin 4 of USB JTAG NT.
When USB JTAG NT is unplugged it works as regular modem.
Connection
NETGEAR CG3100D:
This modem DOCSIS 3.0 modem and has BCM3380 CPU.
It employs 8M SPI flash.
Use USB JTAG NT's can program the flash ISP.
 |
The SPI chip |
The ISP pin uses pin 4 of USB JTAG NT.
When USB JTAG NT is unplugged it works as regular modem.
Connection
| JTAG connector of USB JTAG NT | Pin on the flash |
| Pin 4(GND) | ISP |
| Pin 3(TDI) | Pin 15(SI) |
| Pin 5(TDO) | Pin 8(SO) |
| Pin 9(TCK) | Pin 16(SCK) |
| Pin 11(RESET) | Pin 7 (CS) |
| Pin 2(GND) | Pin 10(GND) |
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