DIGITAL 2T-CSRTC PCI Real Time Clock

This document is the User's Guide for the DIGITAL 2T-CSRTC PCI Real Time Clock (RTC) module, a single-card plug-in module for PCI-based computer systems. It provides hardware overview, register definitions, and installation instructions for both hardware and the associated device driver for DIGITAL UNIX.

Key aspects of the document include:

• Hardware Overview: Details the module's seven timers (one 64-bit, two 32-bit, and four 16-bit), 8 discrete inputs, and 8 discrete outputs. It explains external connectivity via a 62-pin D-connector on the front panel and provides environmental and electrical specifications.
• Registers: Provides detailed address maps for both the PCI Interface Chip and the Real Time Clock itself, along with descriptions of registers controlling timers, gates, and interrupts.
• Device Driver: Outlines the installation of the PCI RTC device driver on DIGITAL UNIX systems using the setld command, including instructions for static and dynamic linking into the kernel.
• Programming Interfaces: Documents the driver's interface, covering system calls like open(), close(), ioctl() (with various requests for status and control), and mmap() for memory mapping.
• Verification: Includes source code listings (rtc_ivp_def.h and rtc_ivp.c) for an installation verification program (rtc_ivp) that tests the hardware components, timer functionality, and interrupt handling.