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參數(shù)資料
| 型號： | NM95MS14 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Plug n Play Front-End Devices for ISA-Bus Systems |
| 中文描述： | 插銷N播放前端ISA設(shè)備，總線系統(tǒng) |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 162K |
| 代理商： | NM95MS14 |
INTRODUCTION
The NM95MS14 is a single-chip solution for the ISA Plug ’n
Play (PnP) specification. It implements the complete state
machine and the necessary logic for supporting configura-
ble Interrrupts and DMA channels on the ISA bus for one
logical device. Apart from providing ‘‘Plug ’n Play’’ capabili-
ty,
it
has
built-in
EEPROM
EEPROM. This device is available in a space saving 48-pin
Thin Quad Flat Pack (TQFP) package.
that
eliminates
external
Functional Description
NM95MS14 has two modes of operation, viz,‘‘DMA mode’’
and ‘‘Extended Interrupt mode’’. These modes are pro-
grammed using the mode select (MS) bits in one of the
configuration registers (Refer to the User’s guide for de-
tailed information). Each of these modes are discussed be-
low.
DMA Mode
In the DMA mode, support is provided for
A) One on-board DMA request that is switchable to any two
DMA channels on the ISA bus.
B) Two on-board interrupt request lines switchable to any
six IRQ lines on the ISA bus.
C) Two programmable I/O chip selects for on-board logic.
Figure 1 shows a Block Diagram of NM95MS14 configured
for DMA Mode.
Block Diagrams
(Continued)
TL/D/12315–6
FIGURE 1
Extended Interrupt Mode
In the Ext. Int mode, support is provided for:
A) Two on-board interrupt request lines switchable to any eight IRQ lines on the ISA bus.
B) Four programmable I/O chip selects for on-board logic.
C) ISA address SA12 and SA13 are also included for extended decode.
Figure 2 shows a Block Diagram of NM95MS14 configured for Extended Interrupt Mode.
TL/D/12315–7
FIGURE 2
http://www.national.com
6
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相關(guān)代理商/技術(shù)參數(shù) |
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| NM95MS14S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Plug-and-Play Controller |
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| NM95MS15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| NM95MS15S | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Plug and Play Front-End Device for ISA-Bus Systems |
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