The Bi Ra model 1302-LM is a double width crate controller that provides the standard interface between the CAMAC crate dataway and the Branch Highway. The type A-2 controller is interchangeable with the older type A-1 controllers. The controller must reside in crate positions N24 and N25. The type A-2 controller has an auxiliary controller bus and priority arbitration logic that allows auxiliary controllers and processors to operate with the CAMAC crate dataway as described in IEEE std. 675. The Model 1302 has additional non-mandatory features that enhance the operation of the controller especially then being used with auxiliary controllers and modules that are slow in responding. LAM handling has been enhanced with the addition of a Graded-LAM Mask Register and a Graded-LAM Encoder. The Mask Register allows masking LAM's that are serviced by Other controllers (processors) in the system. The Mask Register is written with an N30, F17, & A13 command. The LAM encoder encodes the LAM into a 5-bit binary number that can be read with an N30 FO & A8 command. LAM's are graded from 1-23, with LAM 23 being the highest. External Demand (D) has the highest priority binary 37. The P2 hold option is strap selectable on the back of the right PC board. The P2 line is used for the handshake between the module and controller. The hold signal is used to adjust the controller timing to that of the module.
The Model 1302 crate controller facilitates parallel data transfers between CAMAC modules in a crate and a CAMAC Branch Highway Driver (such as the BiRa Model 1711 CBHI, VME Based CAMAC Branch Driver) located near the computer. Up to seven crates, each with a Type A controller, can be on one branch highway. The total length of this highway can be up to 50 meters with standard branch highway cables (Model 8102-X). The highway should be terminated at both ends. The Model 6601 is used to terminate the last controller on the highway. The front panel has two 132-pin Branch Highway connectors. Four LEMO connectors for request, Grant-In, Grant-Out, and Inhibit. Three switches, a rotary switch for selecting crate address, an On-Line switch, when in the Off-Line position enable the clear and initialize switch. LED indications for DEMAND, INHIBIT, and ACL mode. The two connectors on the rear panel are the standard 52-pin Graded LAM Connector and the 40-pin Auxiliary Controller Bus Connector.
| ACTION | COMMAND | RESPONSE |
|---|---|---|
| Generate Dataway Z | N28 A8 F26 | BQ=0 |
| Generate Dataway G | N28 A9 F26 | BQ=0 |
| Read GL | N30 A(0-7) F0 | BQ=1 |
| Load SNR | N30 A8 F16 | BQ=1 |
| Remove Dataway I | N30 A9 F24 | BQ=0 |
| Set Dataway I | N30 A9 F26 | BQ=0 |
| Test Dataway I | N30 A9 F27 | BQ=1 if I=1 |
| Disable BD Output | N30 A10 F24 | BQ=0 |
| Enable BD Output | N30 A10 F26 | BQ=0 |
| Test BD Output Enable | N30 A10 F27 | BQ=1 if enable |
| Test Demands Present | N30 A11 F27 | BQ=1 demand present |
Command operations with N26 generate Dataway signals on all lines N1 through N23. Command operations with N24 generate Dataway signals on N1 through N23 as per contents of the SNR register. BX=1 is generated in response to all controller commands.
To allow more than one Controller to access the Dataway of a CAMAC crate, an Auxiliary Controller Bus (ACB) and priority arbitration protocol are required and are a part of the Type A-2. This permits the use of Auxiliary Controllers (AC's) in normal stations in the crate. The ACB connected between controllers establishes priority for control of the CAMAC dataway. When an AC performs an addressed command operation, it generates the 5 bit binary code for the station number associated with the command and transmits it via the encoded N lines of the ACB. The CC receives this Station Number Code, decodes it and places a logic "1" on the appropriate Dataway N line at the control station. The CC receives the 24 L signals at the control station and passes these signals to the ACB connector. The priority arbitration consists of 2 modes: Request (Grant R/G) and Auxiliary Lockout (ACL). The preferred arbitration mode is the R/G protocol. The type mode is strap selectable from the right PC board. The ACL indicator indicates the ACL mode. Three signals are used in the R/G mode: (1) REQUEST which is bussed to each controller of ACB and is accessible at the front-panel LEMO. (2) Grant-Out of one controller is daisy-chained to Gtant-In of next controller via LEMO connectors. (3) the REQUEST INHIBIT which is bussed on the ACB. The front panel Request signal output of the highest priority Controller MUST be connected to its front panel Grant-In signal input. The Grant- Out signal from this controller is connected to the Grant-In of the next highest priority Controller. The Auxilliary Lockout (ACL) feature is provided to accommodate a Controller which cannot tolerate the delay associated with R/G protocol. In a given crate, only one Controller (which may be either an AC or CC Controller) is allowed to use ACL to gain control of the crate. Upon receiving this signal a controller which has control of the crate will either abort or complete its operation before the controller generating ACL starts its Dataway operation.
| +6 Volts | 2 Amps |
|---|
5 LBS.
Model 1302-LM TYPE A-2 Controller
Model 6601, TERMINATOR MODULE Model 8102-X, BRANCH CABLES Mating Connectors, 2DB52S & 40-pin flat cable.
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Ra Systems, Incorporated
2404 Comanche Road NE
Albuquerque, New Mexico 87107
Ph : 505-881-8887
Fax:505-888-0651