21
When OFS = 1 and CCE = 1 both the data < 1 and the overflows are
eliminated from readout. Pedestal subtraction should be disabled if the
user wants to eliminate just overflows. Z function automatically initializes
CAMAC sequential readout mode with pedestal subtraction and data
compression.
1.14 LAM Handling
The LAM is inhibited if the CLE bit of the Status Register is off. If CLE is
ON, LAM is activated as soon as the data are ready for CAMAC readout.
During sequential readout, the LAM is cleared after readout of the last
word.
The states of the LAM may be tested by the following functions:
F(8) A(0)
gives Q = 1 response if LAM present
F(10) A(0)
gives Q = 1 response if LAM present and clears LAM at
S2 if LAM was present.
The LAM is also cleared by the following functions: front-panel CLEAR
input and Z, C, F(9) A(0), strobed by S2. After an initialization Z function,
the CLE command is set to ON.
1.15 FERA System
Connections
The Model 4300B may function independently or as part of larger system
(of up to 22 4300B modules) controlled by the Model 4301, FERA Driver
(see Figure 1.3 and Model 4301 User’s Manual). This driver sends or
receives all the signals necessary to operate the system. The following
interconnections must be made to ensure proper operation of the
system:
a.
Command Bus; between Model 4301 and each Model 4300B
(8 x 2 wire flat cable).
b.
ECL port data Bus: between INput connector of Model 4301 and
each Model 4300B (17 x 2 wire flat cable).
c.
Readout Enable/Pass: between REQ output of Model 4301 and REN
input of the first Model 4300B to be read. Also, between each Model
4300B, the PASS output is to be connected to the REN input of the
next unit; 1 x 2 wire cable (LeCroy type STP-DC/02-00).
When more than two 4300B modules are connected to these busses, the
input matching and pull-down resistors must be removed from ECL port
and Command busses on all 4300Bs except the one located opposite
the Model 4301 FERA Driver as it serves as a terminator for these
busses (see Figures 1.3 and 1.5). To check the set up, it is sufficient to
observe the PD ON LED indicators on the Command and ECL port bus.
On these two busses, all LEDs on modules placed between the termina-
tor module and the driver should be off.
Содержание 4300B
Страница 22: ...25 Figure 1 3 FERA SYSTEM CONNECTIONS ...
Страница 23: ...26 Figure 1 4 MODEL 4301 FERA DRIVER BLOCK DIAGRAM ...
Страница 24: ...27 Figure 1 5 LOCALIZATION OF REMOVABLE RESISTORS AND VGND GND JUMPER ...
Страница 34: ...38 Figure 2 1 MODEL 4300B BLOCK DIAGRAM ...
Страница 35: ...39 Figure 2 2 CHARGE TO TIME CONVERTER BLOCK DIAGRAM AND TIMING ...
Страница 36: ...40 Figure 2 3 TIME TO DIGITAL CONVERTER BLOCK DIAGRAM AND TIMING ...
Страница 37: ...41 APPENDIX 3 1 ECL DIFFERENTIAL I O LEVELS ...
Страница 38: ...42 APPENDIX 3 2 ECL SINGLE ENDED I O LEVELS ...
