SA811F主控板卡,ABB產(chǎn)品重量
? 不要短路。? 不要拆卸、變形或施加過(guò)大壓力。
? 不要加熱或焚燒。? 不要直接使用焊料。
? 不要使用不同型號(hào)的電池，也不要將新舊電池一起使用。? 不要充電。
? 始終檢查正確的極性?？删幊潭〞r(shí)器在本地處理器可用的資源中，有許多可編程定時(shí)器。定時(shí)器并入PIB控制器，并Z8536 CIO設(shè)備如圖1-1和圖3-1所示。他們可編程為對(duì)處理器產(chǎn)生周期性中斷。間隔計(jì)時(shí)器
SA811F主控板卡PCI-ISA網(wǎng)橋控制器有三個(gè)內(nèi)置計(jì)數(shù)器，用作可編程間隔計(jì)時(shí)器。計(jì)數(shù)器分組為一個(gè)計(jì)時(shí)器PIB控制器中的定時(shí)器1裝置。每個(gè)計(jì)數(shù)器輸出都有一個(gè)特定的功能：? 計(jì)數(shù)器0與中斷請(qǐng)求行IRQ0相關(guān)聯(lián)。它可能是用于系統(tǒng)計(jì)時(shí)功能，例如時(shí)間功能。
? 計(jì)數(shù)器1為ISA內(nèi)存生成刷新請(qǐng)求信號(hào)。這MVME2700中未使用計(jì)時(shí)器。
? 計(jì)數(shù)器2為上的揚(yáng)聲器輸出功能提供音調(diào)PIB控制器（揚(yáng)聲器輸出信號(hào)，可通過(guò)電纜連接至通過(guò)遠(yuǎn)程重置連接器連接外部揚(yáng)聲器）。間隔計(jì)時(shí)器使用OSC時(shí)鐘輸入作為其時(shí)鐘源。這個(gè)
MVME2700使用14.31818 MHz時(shí)鐘源驅(qū)動(dòng)OSC引腳。
16位定時(shí)器MVME2700上有四個(gè)16位定時(shí)器。PIB控制器提供一個(gè)16位計(jì)時(shí)器；Z8536 CIO設(shè)備提供了另外三種。
有關(guān)對(duì)這些計(jì)時(shí)器進(jìn)行編程的信息，請(qǐng)參閱Winbond W83C553 PIB控制器和Zilog Z8536 CIO設(shè)備。串行通信接口MVME2700使用Zilog Z85230 ESCC（增強(qiáng)串行通信控制器）來(lái)實(shí)現(xiàn)兩個(gè)串行通信接口，通過(guò)P2路由。Z85230支持同步（SDLC/HDLC）和異步協(xié)議。這個(gè)MVME2700硬件支持110B/s的異步串行波特率至38.4Kb/s。
? Do not short circuit.
? Do not disassemble, deform, or apply excessive pressure.
? Do not heat or incinerate.
? Do not apply solder directly.
? Do not use different models, or new and old batteries together.
? Do not charge.
? Always check proper polarity.
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 as diagrammed in Figure 1-1 and Figure 3-1. They
can be programmed to generate periodic interrupts to the processor.
Interval Timers
The PCI-ISA Bridge controller has three built-in counters that serve as
programmable interval timers. 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 MVME2700.
? Counter 2 provides the tone for the speaker output function on the
PIB controller (the SPEAKER_OUT signal which can be cabled to an
external speaker via the remote reset connector).
The interval timers use the OSC clock input as their clock source. The
MVME2700 drives the OSC pin with a 14.31818 MHz clock source.
16-Bit Timers
Four 16-bit timers are available on the MVME2700. The PIB controller
supplies one 16-bit timer; the Z8536 CIO device provides the other three.
For information on programming these timers, refer to the data sheets for
the Winbond W83C553 PIB controller and the Zilog Z8536 CIO device.
Serial Communications Interface
The MVME2700 uses a Zilog Z85230 ESCC (Enhanced Serial
Communications Controller) to implement the two serial communications
interfaces, which are routed through P2. The Z85230 supports
synchronous (SDLC/HDLC) and asynchronous protocols. The
MVME2700 hardware supports asynchronous serial baud rates of 110B/s
to 38.4Kb/s.
