PIA Equipped Microscope Scan and Blanking Interface

## Electron Beam Blanking The blanking connector on the PIA is not used Instead we could inject a reference voltage directly into the summing node on the gun deflector regulator board. The summing amps in the current regulator are driven by opamps that are powered off of +-12VDC, so if we can switch in and out a singal that can be tuned between +-12VDC we can on command do the same thing that blank/un-blank does. What would we need to do this? - A potentiometer to be able to adjust a +-12v voltage - A way to use glasgow digital IO to either apply the voltage to the summing amp or - leave it disconnected and in a high impedance state? - Analog switch - [[ADG5412BRUZ Analog Switch]] - 3v compatible logic inputs, supply range up to +-20VDC - 4x switches - Open when logic low - So when/if the mod is unplugged or glasgow is powered down the scope revers to normal operation - Set the voltage to ground? - A LED to indicated the state of the switch - ## Power going to need a long power cable to reach the rack ## EOCU connections P20 looks like Scan In (can follow it back from DSPB) ![[CleanShot 2024-03-26 at [email protected]|grid]]![[CleanShot 2024-03-26 at [email protected]|grid]] ![[Pasted image 20240326121135.jpg]] EOCU J5 and J4 are blanking: ![[Pasted image 20240326121152.jpg]] J5 and J4 are HV going directly to the column ![[CleanShot 2024-03-26 at [email protected]]] The cable that feeds the blanking card is J14 on the EOCU. That cable is connected to PIA X33. One of the wires off teed of the CDEM goes to X40 on the PIA ### J14 pin out | j14 Pin | Goes To j13 | reciverr | | ------- | ----------- | -------- | | 1 | 1-14 | 2 | | 2 | 1-15 | 6 | | 3 | 1-16 | | | 4 | 1-17 | | | 6 | 3-14 | 1 | | 7 | 3-15 | 7 | | 8 | 3-16 | | | 9 | 3-17 | | | | | | Found that the reciver (DS26C32ATM) is connected via jumpers to pins 3-16 and 1-16 ## E-beam blanking Is done via the gun deflectors on this model microscope, which do not behave the same way that the FIB column does Is blanking done over CAN bus? Fast beam blanker: https://www.semservice.com/products/ ## PIA component and PCB analysis PIA = Patterning, Imaging, and Acquisition Module Four [[MAX454]]SCAP Video Amplifier and MUX on the Video In side [[AD8056A]] dual op amp [[AD9235]] ADC [[LTC1668]]CG DAC One FPGA for "In", one FPGA for "out" 128MB of RAM for ADC FPGA 256MB of RAM for DAC FPGA DAC output buffer op amp: [[AD8017]]AR There are separate ground planes for the DACs and ADCs Appears that the X and Y can be looped back into the ADC (self-test?) Card edge connectors are not soldered in, just pressed in board looks like 6 or 8 or 10 layers ![[Pasted image 20240326172556.jpg]] ![[Pasted image 20240326172633.jpg]] ### External amp board Also split into two ground planes Two [[LTC1668]]CG DACs Looks like they go to [[MAX454]]SCAP Video Amplifier and MUX One digital mezzanine connector, one analog DAC connector, one analog ADC connector? ![[Pasted image 20240326172714.jpg]] ![[Pasted image 20240326173307.jpg]] ### status LEDs H1 is green and blinks in boot mode H2 is off in boot mode, and blinks in application mode The Act LED is yellow and blinks when there is Ethernet activity The Link LED is green and is on when an ethernet connection is established at 1Gbps ## PIA Backplane Cables currently plugged in: X10: two pin, white and brown wires X38: two pin, white and brown wires X33: Blanking cable X21: Scan cable (X22 was plugged in to X21) guessing X21 and X22, X34 and X33 are wired together X40: CDEM ### Scan signals #### X22 connector: ![[XT Pia Scan and blanking.jpg]] The bottom pinouts on both sides of this drawing represent the same connector - in reality, these are layered on top of each other. The PIA side uses connectors with Quick Lock pins. [[TE Quick Lock D Sub]] ![[Pasted image 20240326173436.jpg]] #### X21 backplane X21 pin 1 goes to X2 (card edge) pin 1-5 (column 1, row 5) | X21 Pin | Goes To | | ------- | ------- | | 1 | X2 1-5 | | 2 | GND | | 3 | NC | | 4 | GND | | 5 | X2 3-5 | | 6 | X2 1-6 | | 7 | NC | | 8 | NC | | 9 | X2 3-6 | #### X22 backplane | X21 Pin | Goes To | | ------- | ------- | | 1 | X2 1-2 | | 2 | GND | | 3 | NC | | 4 | GND | | 5 | X2 3-2 | | 6 | X2 1-3 | | 7 | NC | | 8 | NC | | 9 | X2 3-3 | #### Scan signals during live operation Unplugged from EOCU P20/PIAMX22 Wasn't scanning, moved to the other port on PIA, now it is scanning Differential pairs are (1 and 6) and (5 and 9) ==NOT== (5 and 6) and (1 and 9) - need to update drawing Ramps are +- 2.5V Scan rotation didn't change anything on these signals, so that transformation is very likely happening in the EOCU ##### 1 and 6: Y Pin 1: Ramp negative to positive Pin 6: Ramp positive to negative Yellow: Pin 1 Blue: Pin 6 + ![[Pasted image 20240326202332.jpg]] ##### 5 and 9: X Yellow: Pin 5 +, Blue: Pin 9 ![[Pasted image 20240326202514.jpg]] ### Blanking signals #### J14 Cable is straight through #### X33 to X1 X1 = card edge | X33 Pin | Goes To X1 | | ------- | ---------- | | 1 | 1-22 | | 2 | 3-22 | | 3 | 1-19 | | 4 | 3-19 | | 5 | GND | | 6 | 1-23 | | 7 | 3-23 | | 8 | 1-20 | | 9 | 3-20 | #### X34 to X1 | X34 Pin | Goes To X1 | | ------- | ---------- | | 1 | 1-16 | | 2 | 3-16 | | 3 | 1-13 | | 4 | 3-13 | | 5 | GND | | 6 | 1-17 | | 7 | 3-17 | | 8 | 1-14 | | 9 | 3-14 | ### PIA Backplane PCB and component analysis TI [[AM26C32]] Quadruple differential line receiver ![[Pasted image 20240326152539.jpg]] [[MAX3030E]] Quad RS-422 transmitter There are two of these MAX3030E transceivers, one on the front and one on the back, and X33 and X34 both use both chips. ![[CleanShot 2024-03-26 at [email protected]|lg]] ### X33 to transceivers | X33 Pin | Goes To X1 | Goes to transceiver | | ------- | ---------- | ------------------- | | 1 | 1-22 | Back D04+ | | 2 | 3-22 | Front D04+ | | 3 | 1-19 | Back D03+ | | 4 | 3-19 | Front D03+ | | 5 | GND | | | 6 | 1-23 | Back D04- | | 7 | 3-23 | Front D04- | | 8 | 1-20 | Back D03- | | 9 | 3-20 | Front D03- | Looks a lot like [[FIB 200 Blanking#Blank In]] ### X34 to transceivers | X34 Pin | Goes To X1 | Goes to Transceiver | | ------- | ---------- | ------------------- | | 1 | 1-16 | Back D02+ | | 2 | 3-16 | Front D02+ | | 3 | 1-13 | Back D01+ | | 4 | 3-13 | Front D01+ | | 5 | GND | | | 6 | 1-17 | Back D02- | | 7 | 3-17 | Front D02- | | 8 | 1-14 | Back D01- | | 9 | 3-14 | Front D01- | ### Signals during live imaging Unplugging J14 from the EOCU side | + | - | | --- | --- | | 1 | 6 | | 2 | 7 | | 3 | 8 | | 4 | 9 | Polarity is based on the positive one of the pair | Pins | Blanked Scan | Unblank Scan | Spot Blanked | Spot Unblanked | | ---- | ------------ | -------------- | ------------ | -------------- | | 1 | l pulse high | l pulse high | h | h | | 2 | l nc | l nc | l | l | | 3 | h pulse low | h pulse low | h | h | | 4 | l nc | l nc | l | l | | 5 | | | | | | 6 | h pulse low | h pulse low | l | l | | 7 | h nc | h nc | h | h | | 8 | l pulse high | low pulse high | l | l | | 9 | h nc | h nc | h | h | - pin 8, unblanked scan - ![[Pasted image 20240326212243.jpg]] - - pin 3, unblanked scan - ![[Pasted image 20240326212416.jpg]]