SCB
The SCB is the main part of the switch.
The modified SCB is larger than the original one. Together with the space saved from the removed components/connectors, the FPGA has many pcb space around for a larger heat sink.
*Clock tree
- the clock processing and distribution of the SCB is shown below
https://www.ohwr.org/5590
*Power tree
- The power generation circuit has been modified from SCB_v3.4 with
more DC/DC rails to reduce overburden power consumption.
https://www.ohwr.org/5591
*Reset tree
*Component replacement
- Few components are replaced for wider temperature range or better
thermal performance.
| SCB_v3.4| SCB_FL| Note|
| MC100LVEP14DT | MC100LVEP111MNG | LvPECL fanout IC, change to 10channel version with QFN package |
| MC100EP52DR2 | MC100EP52MNR4G | The DFF change to QFN package |
| FNETHE025 | 7N-25.000MBP-T| FPGA 25MHz TCXO, change for wider temp. range |
| 7M-12.000MAAJ-T | ABM8W-12.0000MHZ | ARM CPU TCXO, change for wider temp. range |
| MAX3232CDBR | ICL3232EIBNZ | RS232 driver/receiver for wider temp. range |
| CP2102-GM | CP2102N-A01-GQFN28 | CP2102 not recommend for new design. Pin compatible |