Hit Buffer to_do.

Last update: 23 April 1998  (*X* means Xilinx logic change)

1. Footprint tagram
2. 5-rows P1 and P2
4. Geographical address (a'la AMS): P1, pull-ups, switches,
   *X* invert in Xilinx !
5. VME ETL tranceiver
6. ID Prom on data bits 27..31
7. INIT, ERROR, FREEZE on P2
8. INIT and FREEZE low active (add inverter gate)
9. Stiffner
10. Connect EF_ from both fifo's for both Roads and Hits
11. LVDS driver/receivers, no pull-ups, ground return etc.
12. New front panel connectors and placements
13. New LED color/placement
14. *X* Add ETL control lines to VME xilinx
15. Single slot: - crosscheck Samsung footprints
                 - tagrams
16. *X* Error bits persistency (Fifo-Ovf, Lost-Sync)
17. ESD strips
18. Roboclock filter capacitors
19. *X* Check Init protocol
20. Transorber
21. picofuse
22. chamfers
23. *X* Add VME supervisor modes (ignore AM<2>)
24. SOIC wherever sensible
25. quartz socket for small/large (like AMB)
26. Vcc island for P1 Vcc pins.
27. front panel without ground connection
28. update documentation
29. *X* change HOLD_IN_ polarity: LVDS failsage status is HIGH
30. remove test points on unused XIlinx outputs.
31. add ground points all over the board for scope probe ground clip
32. Front panel pin assign. as in XTR to SVT and L2 ... document (and AMS)
33. *X* VME ERROR register cleared by INIT

Standing or new problems as of Sep 30 1998
------------------------------------------

1. dividere gli OR (U14) per Hit e Roads in 2 chips ?

2. Aggiunger LEDs e mettere i LED multipli come da doc. AMZ.
   INTERNAL_ERROR ==> modifica a Xilinx ?

3. Leggere stato switches da VME ? ==> modifica a HB_CTNFF ?
   Aggiunta a VMEPLD ?

4. Lettura Spy Buffers in TMODE ==> add internal freeze to VMEPLD

5. togliere TL7705ACD (reset chip), provare su quello di ora ?

6. verificare che non si posono fare operazioni "distruttive"
   se non e' in TMODE (PUSHVME ?!)

7. DS_ out in OU4 ==> OUT1 = OUT0=OUT2=OUT3

8. Unificare part HB-AMS-SC-MRG etc.:
   - HC123
   - AS32
   - ALS08
   - ALS688 al posto di FCT521 ???? DW invece di (Q?)S(?)SOP ?