Vx/IP-1553-[BC/RT-MT] Features Summary Copyright (c) 1996 Compware Corp.

The Vx/IP-1553 Device Support Package from Compware together with the SBS/Greenspring IP-1553 Industry Pack device provides versatile MIL-1553 operation.

The IP-1553 is based on the ILC/DDC BU61580, which provides 8K of internal RAM and intelligent dual redundant-channel frame-based (for BC) and subaddress-based (for RT) bus access. The BU61580 provides multi-channel retry capability in a transparent, host independent format, combined with complete error and retry status reporting and time tagging of all messages.

The Vx/IP-1553 driver extends the BU61580 functionality by creating devices that may be consistently accessed whether onboard (internal-RAM) of offboard (host-RAM) a particular BU61580. Concurrency of execution is encouraged between the vxWorks processor building BC frames and processing RT subaddress buffers and the BU61580 transacting messages to the bus. vxWorks devices may be attached and detached from the BU61580, allowing a large number of virtual 1553 bus based objects. At the same time, critical transactions occur while devices are attached, including data transfers, minimizing copying times.

The BC driver support is built around frame devices, each of which corresponds to a 1553 minor frame. These may be transacted to the bus on a single cycle or autorepeat basis; the autorepeat functionality provided by the BU61580 is generalized by the driver to permit 1 cycle, "n" cycles or indefinite activation of BCminor frames. Frame devices may be organized on a timeline basis, or a sequential basis. Timelineframes transmit messages at selected times within an overall fixed frame time. Sequential frames are transmitted on an immediate sequential basis. BC frames are initially built with detached frame devices, writing messages into vxWorks memory. After attachment, frames may be activated to the bus, and dynamically read and written.

Ioctl operations allow attach, detach, activation, deactivation, and wait on condition, specific message completion, or frame completion. Special format and deformat routines, which operate on either attached or detached frames, allow message access on an implementation independent basis.

The RT driver features both frame and subaddress devices. Subaddress devices access the BU61580 illegalization, busy setting, and selective condition waiting on an ioctl basis.

A mode command device allows command type waiting, data word setting, and illegalization/busy by means of ioctl calls. Direct reads and writes to subaddress devices support data transfer; an ioctl is available to wait on data buffering levels. A means of reliable reading of the "most recent message" to a subaddress is provided by the BU61580 and supported by the driver implementation.

RT frame devices allow sequential reading of incoming messages with time tags, independent of subaddress and message type.

MT frame devices are similar to RT frame devices, with additional support for message selection.

Vx/IP-1553 software provides a device discovery interface consistent with other Compware drivers. A registration function for the Industry Packs allows IPs to transparently reside on VME bus carriers, onboard the MVME162, and some additional platforms. Hardware discovery is based on the general Greenspring ID prom and self-testing specific to target IP's. The IP-1553 self test includes checks of RAM, register and interrupt capability. A consistent system of defaulting allows convenient specification of functionality options at device creation time and (with some restrictions) dynamically by means of ioctls. Help routines, consistent vxWorks module error denotation, self check routines, and an extensive group of test applications and scripts aid software reliability and maintainability.

Copyright (c) 1996 Compware Corp.

1Sep96