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The AN/AYK-14(V) is a family of computers for use in military weapons systems.^[1] It is a general-purpose 16-bit microprogrammed computer, intended for airborne vehicles and missions. Its modular design provides for common firmware and support software. It is still in use on Navy fleet aircraft including the F/A-18, and the AV-8B. The AN/AYK-14(V) family of systems is designed to meet MIL-E-5400 (airborne) requirements.^[2]

General information

The AN/AYK-14(V) computer was designed for military weapons systems. A complete AN/AYK-14(V) computer system is composed of processor, memory and input/output (I/O) modules.^[1]

Applications

Aircraft
- F-18 Central Mission Computers
- LAMPS MKIII Central Mission and ESM Processor
- EA-6B Electronic Warfare Computer
- E-2C Passive Detection System Computer
- AV-8B Central Mission Computer
- EP-3 Electronic Data Processor
- P-3C ESM Processor
- F-14 Avionics Improvement Program
Special applications
- ALWT Torpedo Guidance Computer
- ACLS Landing System Processor
- DASS ASW Training Computer
- Firebrand Drone Guidance Computer

Technical description

The AN/AYK-14(V) series of systems are microprogrammed computers, intended for airborne vehicles and missions, but are also capable of shipboard and land use.^[2]

General characteristics

The AN/AYK-14(V) is a general-purpose 16-bit computer capable of 675 thousand operations per second. Its modular design provides for common firmware and support software.^[2]

System specifications and features

General Features

General-purpose 16-bit digital computer
Physically and functionally modular
Expandable with plug-ins and additional enclosures
Microprogrammed to emulate an extended AN/UYK-20
LSI components
ATR enclosures
Variable configurations

Central Processor

Microprogrammed
2's complement arithmetic
Executive and user states
Two sets of 16-word by 16-bit general registers
Two status registers
Three-level interrupt system
Addressing to 524,288 words
Fixed and floating-point arithmetic
4-, 8-, 16-, and 32-bit operands
16-, and 32-bit instructions
Direct, indirect, and indexed addressing
Optional hardware floating-point module
Loadable/readable 32-bit RTC clock, 1-MHz rate; 16-bit monitor clock, 10-KHz rate
Built-in-test functions
Bootstrap PROM memory
Power failure shutdown/recovery
I/O controller capability
- Chaining capability
- Control memory for each channel
- Up to 16 channels in various combinations
Interface to support equipment
Sample instruction times
- Shift 1.5 μsec
- Add, subtract 0.8
- Multiply 4.2
- Divide 8.4
- Basis: single GPM, core memory, overlapped access, interleaved addresses

Memory control and memory

Core memory module (CMM), 32K words of 18 bits
Semiconductor memory module (SMM), 32K words of 18 bits
Interchangeable core and semiconductor memory modules
CMM has 900-nanosecond cycle time and 350-nanosecond access time
SMM has 400-nanosecond cycle time and 200-nanosecond access time
Interleaved or non-interleaved addressing
Read/write expandable memory (RXM), 4K x 18-bit RAM with optional 4K PROM
Parity bit per byte
Protect features
- Write protect
- Read protect
- Execute protect
- Block protect in paging system
Memory controller with paging to 524,288 words

I/O Processor (optional)

I/O controller capability
Instruction subset compatible with central processor
Microprogrammed
Usable in conjunction with a central processor or as a stand-alone processor
Real-time and system clocks
16-word by 16-bit general register set
Addressing to 65,536-words
Fixed point 16-bit arithmetic
Interface to support equipment

Subsystems

Processor

The general processing control module (GPM) and the processor support module (PSM) make up a 16-bit central processor. for a general purpose computer. The extended arithmetic unit (EAU) is 32-bit floating-point hardware, controlled by the GPM. An input/output processor (IOP) can be added to increase processing throughput. It can function as an input/output controller (IOC) or as a single-module, 16-bit general purpose CPU.^[2]

Memory

The memory subsystem includes two 32K-word with an 18-bit word length. The memory control module (MCM) provides the interface between the GPM and the memory modules. The read/write expandable memory module (RXM) is a 4K word module with an 18-bit word that serves as memory for the IOP.^[2]

Input / Output

The AN/AYK-14(V) can support up to 16 I/O channels. A single chassis provides four to six I/O channels. XN-3 type enclosures can be added to expand the number of I/O channels.^[2] I/O module types include: