HIEE401091R0002模拟量卡件，ABB怎么使用
访问PIB（PCI/ISA桥）的配置空间控制器通过CONADD和CONDAT执行Raven bridge控制器中的（配置地址和数据）寄存器ASIC。寄存器分别位于偏移量$CF8和$CFC，来自PCI输入/输出基址。实时时钟/NVRAM/计时器功能MVME2603/2604采用SGS汤姆逊表面贴装M48T59/T559 RAM和时钟芯片，提供8KB的非易失性静态数据RAM、实时时钟和看门狗定时器功能。
HIEE401091R0002模拟量卡件该芯片提供时钟、振荡器、晶体、电源故障检测、存储器写入保护，8KB的NVRAM，以及一个由两个❏ 包含实时时钟的28针330mil SO设备振荡器，电源故障检测电路，定时器逻辑，8KB静态RAM和电池的镀金插座❏ SNAPHAT®电池包含一个晶体和电池SNAPHAT电池组安装在M48T59/T559的顶部装置电池外壳带有键，以防止反向插入。
时钟提供秒、分、时、日、日、月和年BCD 24小时格式。28、29（闰年）和30天的修正月份是自动生成的。时钟不会产生中断。虽然M48T59/T559是8位设备，但8位、16位和32位访问支持从ISA总线到M48T59/T559。请参阅MVME2603/2604程序员参考指南和M48T59/T559数据表，均列在附录D中，相关文档，以获取详细的编程和电池寿命信息。可编程定时器在本地处理器可用的资源中，有许多可编程定时器。定时器并入PIB控制器，并Z8536 CIO设备（如第1-2页图1-1和图2所示）第3-4页的3-1）。可以对其进行编程以产生周期性中断到处理器。间隔计时器PCI-ISA网桥控制器有三个内置计数器，分别是相当于82C54可编程间隔计时器中的值。这个在PIB控制器中，计数器被分组为一个计时器单元，即计时器1。每个计数器输出具有特定功能：❏ 计数器0与中断请求行IRQ0相关联。它可能是用于系统计时功能，例如时间功能。❏ 计数器1为ISA内存生成刷新请求信号。这MVME2603/2604中未使用计时器。
Accesses to the configuration space for the PIB (PCI/ISA Bridge)
controller are performed by way of the CONADD and CONDAT
(Configuration Address and Data) registers in the Raven bridge controller
ASIC. The registers are located at offsets $CF8 and $CFC, respectively,
from the PCI I/O base address.
Real-Time Clock/NVRAM/Timer Function
The MVME2603/2604 employs an SGS-Thomson surface-mount
M48T59/T559 RAM and clock chip to provide 8KB of non-volatile static
RAM, a real-time clock, and a watchdog timer function. This chip supplies
a clock, oscillator, crystal, power failure detection, memory write
protection, 8KB of NVRAM, and a battery in a package consisting of two❏ A 28-pin 330mil SO device containing the real-time clock, the
oscillator, power failure detection circuitry, timer logic, 8KB of
static RAM, and gold-plated sockets for a battery
❏ A SNAPHAT® battery housing a crystal along with the battery
The SNAPHAT battery package is mounted on top of the M48T59/T559
device. The battery housing is keyed to prevent reverse insertion.
The clock furnishes seconds, minutes, hours, day, date, month, and year in
BCD 24-hour format. Corrections for 28-, 29- (leap year), and 30-day
months are made automatically. The clock generates no interrupts.
Although the M48T59/T559 is an 8-bit device, 8-, 16-, and 32-bit accesses
from the ISA bus to the M48T59/T559 are supported. Refer to the
MVME2603/2604 Programmer’s Reference Guide and to the
M48T59/T559 data sheet, both listed in Appendix D, Related
Documentation, for detailed programming and battery life information.
Programmable Timers
Among the resources available to the local processor are a number of
programmable timers. Timers are incorporated into the PIB controller and
the Z8536 CIO device (diagrammed in Figure 1-1 on page 1-2 and Figure
3-1 on page 3-4). They can be programmed to generate periodic interrupts
to the processor.
Interval Timers
The PCI-ISA Bridge controller has three built-in counters that are
equivalent to those found in an 82C54 programmable interval timer. The
counters are grouped into one timer unit, Timer 1, in the PIB controller.
Each counter output has a specific function:
❏ Counter 0 is associated with interrupt request line IRQ0. It can be
used for system timing functions, such as a timer interrupt for a
time-of-day function.
❏ Counter 1 generates a refresh request signal for ISA memory. This
timer is not used in the MVME2603/2604.
parts:
