Light Pulser Board (LPB)
1
Purpose
The Light Pulser Board (LPB) handles the operation of the LED light flasher for all the MPPC channels of each crate of the FGD.
Description
Each LPB card handles 60 pulsing channels. Each channel fires 4 consecutive LEDs mounted at the far end of the wave shifting fibre at the opposite side of the MPPC. A single pulse with can be controlled through a delay (idx6) for all LED channels. The pulse hight is controllable by a DAC for group of 8 LED channels. The first LED channel is monnitored through an ADC channel (idx:7). The overall monitoring of the card is ensured by several ADCs for the differents voltages, current and temperature. While each card can read the internal relative humidity of the FGD box on the backplane, only a restricted number of crate have the RH sensor installed.
- Current list of LPBs address containing a RH sensor:
- FGD1 Bottom(C1, C3), TOP(C8), Right(14), Left(21)
- FGD2 Bottom(C27), TOP(C32), Right(38), Left(45)
Card Operation
- By default at power up the main elements of the card are kept unpowered.
- To power up the card:
- CTL register(idx:2) Set bit ^ 0 [0x01]
- CSR register(idx:3) will show bit ^ 0 = 1 (1=on, 0=off)
- To power down the card:
- CTL register(idx:2) Set bit ^ 7 [0x80] Manual Shutdown
- CSR register(idx:3) will show bit ^ 0 = 0 (1=on, 0=off)
- Global Delay(idx:6) set for all the 60 LED channels.
- Pulse hight DAC(idx:21-36) 12bit DAC, set for 4 consecutive LED channels corresponding to 16 LEDs or 1/6 of a layer.
- Issues
- The voltage monitoring is valid only once the card is powered up.
- The S/N is read incorrectly if the Vdd is not ON. This requires the turn on procedure to re-issue the ON once the WIENER's power supplies are turned on.
MSCB Registers
node253(0xFD)> r
0: SerialN 32bit U 76500005 (0x048F4C25) byte
1: Error 16bit U 6 (0x0006) byte
Vss Slow Control Voltage 0x0001
Iss Slow Control Current 0x0002
Vdd Main +6V 0x0004
Idd Main +6V 0x0008
N/A 0x0010
I3.3V 0x0020
I1.8V 0x0040
uC Temperature 0x0080
Vdd Switch fault 0x8000
2: Control 8bit U 0 (0x00/00000000) byte
Turn on Card 0x01
N/A 0x02
N/A 0x04
TEST mode for CPLD 0x08
EEPROM Save 0x10
EEPROM Restore 0x20
N/A 0x40
Manual Shutdown card 0x80
3: Status 8bit U 1 (0x01/00000001) byte
Card ON 0x01
N/A 0x02
N/A 0x04
TEST mode Set for CPLD 0x08
EEPROM Save complete 0x10
EEPROM Restore complete 0x20
System shutdown (card OFF) 0x40
Manual Shutdown (card OFF) 0x80
4: eepage 8bit U 0 (0x00/00000000) byte
EEPROM page should be 0
5: Spare 8bit U 0 (0x00/00000000) byte
6: Delay 16bit U 16 (0x0010) byte
7: D2Ashft 32bit F 4.3153 volt
First LED channel monitoring (rdac0)
8: pDVsc 32bit F 4.85406 volt
9: pDIsc 32bit F 0.149902 ampere
10: pDV6 32bit F 5.74984 volt
11: pDI6 32bit F 0.290039 ampere
12: pDI5 32bit F 0.0146484 ampere
13: pDI33 32bit F 0.242676 ampere
14: pDI18 32bit F 0.00913086 ampere
15: uCTemp 32bit F 30.9 deg. celsius
16: IntTemp 32bit F 25.1275 deg. celsius
17: Temp58 32bit F 24.9556 deg. celsius
18: Temp33 32bit F 24.4712 deg. celsius
19: SHTtemp 32bit F 0 deg. celsius
Backplane internal temperature if applicable
20: RHumid 32bit F 0 percent
Backplane internal humidity if applicable
21: rdac0 16bit U 4000 (0x0FA0) byte
22: rdac4 16bit U 0 (0x0000) byte
23: rdac8 16bit U 0 (0x0000) byte
24: rdac12 16bit U 0 (0x0000) byte
25: rdac16 16bit U 0 (0x0000) byte
26: rdac20 16bit U 0 (0x0000) byte
27: rdac24 16bit U 0 (0x0000) byte
28: rdac28 16bit U 0 (0x0000) byte
29: rdac32 16bit U 0 (0x0000) byte
30: rdac36 16bit U 0 (0x0000) byte
31: rdac40 16bit U 0 (0x0000) byte
32: rdac44 16bit U 0 (0x0000) byte
33: rdac48 16bit U 0 (0x0000) byte
34: rdac52 16bit U 0 (0x0000) byte
35: rdac56 16bit U 0 (0x0000) byte
36: rdacsp 16bit U 0 (0x0000) byte
37: rD2Ashft 16bit U 383 (0x017F) byte
38: rpDVsc 16bit U 634 (0x027A) byte
39: rpDIsc 16bit U 614 (0x0266) byte
40: rpDV6 16bit U 751 (0x02EF) byte
41: rpDI6 16bit U 297 (0x0129) byte
42: rpDI5 16bit U 15 (0x000F) byte
43: rpDI33 16bit U 497 (0x01F1) byte
44: rpDI18 16bit U 374 (0x0176) byte
45: rSHTemp 16bit U 0 (0x0000) byte
46: rRHumid 16bit U 0 (0x0000) byte
47: eepValue 32bit F 0 byte
48: eeCtrSet 32bit U 0 (0x00000000) byte
Location
This card is located in each "crate" mounted on the surrounding structure of each FGD (24 crates per FGD). Each crate contains 1 LPB card the relative address of card to the crate is 5.
