Service Module Rev A ECOs (main board)

List:

• U15: ​ECO Link
• U23: ​ECO Link
• ESM: ​ESM ECO

• R94,R95,R96,R92 Remove resistors.
• Add 4.7k resistor between R95 pad bottom to R92 pad upper ​Example

• R50 should be 10k-ohms for CERN IPMC (SM603)

• R52,R56,R61,R62 should be ~100-ohms (For LEDs so ~10% is fine)

• Samtec headers for FP (J40, J46) are a bit too tall. Suggest sub SAM11085-ND (ESQ-106-23-L-D)

• Remove U11 and U13.

• Replace C2, C14, and C18 with ‎565-4114-ND‎

• Install 3 pin 0.1" header for use with jumpers on J45.

notes:

• 220uF caps should get smaller (physically, too tall)
• Remember to populate R50 with CERN IPMC value.
• We should add a pull-down to U15 pin 1 for when we have no IPMC (added on board 1)​ECO Link
• We should add a pull-up to ETH_SW_RESET_N (Has on-board pull-up, so we are OK)
• Traces under mounting splice plate holes
• U23 has wrong DigiKey? part number ​ECO Link
• A pull up/down should be added between U24 pin 4 and U23 pin 7

Front panel board changes for Rev B

• Remove level shifter and wire direct uSD card to connector
• Change FT232RQ to FT232RL (TSSOP package)
• Wire USB_UART_EN to FT_3V3 through R2 instead of from nDTR
• Change header P/N for headers for longer pins

Service Module TODOs for RevB

• Traces under mounting splice plate holes (move to internal layers/ out of the way)
• GPIO header
• Add level shifters between ESM LED/Serial connections to Zynq to allow for ESM to work when Zynq missing/broken.
• Zynq power good signal to IPMC
• Modify BOOTMODE flipflops