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Time Bus Interface Card

ICD 13—Standard Controller ICD-13/05 17 of 56

7.0 Time Bus Interface Card

Any IOC which is required to know the absolute time to an accuracy better than a few

milli-seconds or to be able to time events to better than a 16 milli-second resolution will

need to have a time bus card installed. This connects to the Gemini master time server

over the coaxial cable delivering the IRIG-B clocks. The time bus gives an absolute

time

accuracy of the order of ±10msec and a resolution of 100ns. For further information on

the Gemini Time Bus refer to the Gemini ICD [7].

7.1 Description

The Standard Controller time bus interface card is the Bancomm bc635VME.ForIOCs

required to be time bus masters the interface card is the Bancomm bc637VME.Docu-

mentation is provided with the card in the form of an Operation and Technical Manual

[8] describing the card’s features, installation and set-up instructions, programming

model, hardware interfaces, and circuit diagrams and a parts list for the board. The GPS

receiver has an additional manual describing its extra functions [9].

7.2 Installation

The Time Bus card is configured using a combination of DIP switches and jumpers (see

chapter 2 of the Operation and Technical Manual [8] for location diagrams). The

switches set the board base address within the VMEbus A16 address space, and should

be set to 0x4000 as follows (On = switch closed):

The jumpers select various I/O options associated with the external connections to the

card. The default settings are used, refer to Table 10 on page 18.

1. Turn off the enclosure power and open the front panel.

2. Install the card in a suitable slot.

TABLE 8. Time Bus Interface Card Specifications

Item Description

Model Number BC635VME

Manufacturer Bancomm

Input Power +5 V @ 1.5 A

+12V@0.05A

-12V@0.03A

Connections 2 off BNC sockets for IRIG-B timecode Input and Output,

DB15 socket for various clock and event signals,

High Density DB15 plug for GPS receiver module connection.

Non-GPS signals are available via the P2 backplane connector.

Dimensions 6U x 1 slot

OperatingTemperature 0to70degreeC

Humidity 5% to 90% non-condensing

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Motorola MVME167 Bedienungsanleitung Seite 17