Connecting to TTTT via usb serial

• The TTTT uses a FTDI USB to serial chip, so if it is plugged in to a linux computer, it should create a device in /dev called ttyUSBX where X is 0 - N
• This can be opened with minicom with the no hardware flow control and 115200 baud 8N1.

Commands

• !!!WARNING!!! If you are writing 64 bit numbers you must zero pad to 64 bits!

• help: list commands
  

• rw: register write
  ex: ">rw 31 0DEB0000000000F1" writes 0x0DEB0000000000F1 to register 0x31
  ​Full Register map (You may have to download the PDF for it to work)
  

• rr: register read
  ex: ">rw 31" reads the contents of register 0x31
  

• bmesg
  

• l1a_rng: BX range that L1As are allowed to be sent out.
  ex: ">l1a_rng 100 D00" allows triggers on BXings greater than or equal to 0x100 and less than 0xD00
  

• l1a_en: enabled trigger sources (look at register 0x35)
  ex: ">l1a_en 1" enables the periodic trigger but doesn't change the state of the other trigger sources
  

1 - periodic
2 - random
4 - external

• l1a_dis: disable a trigger source
  ex: ">l1a_dis 2" disables the random trigger but doesn't change the state of the other trigger sources
  

• l1a_per: set the 16-bit period parameter (larger means lower rate)
  

• l1a_rand: set the 16-bit random parameter (larger means lower rate)
  

• set_rules: sets which trigger rules are active

• get_rules: prints the current trigger rules 0F means all rules are enforced, 0x1 means only

• l1a_adv: used to send a broadcast message and an l1a at specified bunch crossings in one orbit
  ex: ">l1a_adv c00 d00 80" sends an l1a at BX 0xc00 and the boardcast message 0x80 @ bx 0xd00

• l1a: send 1 L1a at the next BX that is in the l1a range (set by l1a_rng)

Other features

• bit 1 of register 0x31 enables the use of the TTS state to control sending L1As. (I'll add a command later)
• bit 0 of register 0x00 resets all registers to their power-up state.

Recipes

Setup

set numer of BX per orbit (-1)

rw 32 0x0000000000000DEB

set system to allow l1as between BX 0x10 and 0xD00, apply all trigger rules, pay attention to TTS state, send BX reset messages

rw 31 0D000010000000F3

Random trigger

set random trigger to ~75kHz (after all trigger rules)

rw 37 400

enable only random trigger

rw 35 2

Periodic trigger mode

Before doing the following commands, make sure the trigger rules are set the way you want and bit 1 of reg 0x31 is set to use/not use TTS state.
Also, you may want to set/check the range of allowed L1A BXs in register 0x31

Disable trigger sources
>l1a_dis 7
Set period parameter for the periodic trigger (this gives about 600hz on the AMC13)
>l1a_per FFFF
Enable the periodic trigger generator
>l1a_en 1