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參數(shù)資料
| 型號： | HPC36064 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High-Performance microController |
| 中文描述： | 高性能微控制器 |
| 文件頁數(shù)： | 25/37頁 |
| 文件大?。?/td> | 487K |
| 代理商： | HPC36064 |
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Shared Memory Support
Shared memory access provides a rapid technique to ex-
change data. It is effective when data is moved from a pe-
ripheral to memory or when data is moved between blocks
of memory. A related area where shared memory access
proves effective is in multiprocessing applications where
two CPUs share a common memory block. The HPC46064
supports shared memory access with two pins. The pins are
the RDY/HLD input pin and the HLDA output pin. The user
can software select either the Hold or Ready function by the
state of a control bit. The HLDA output is multiplexed onto
port B.
The host uses DMA to interface with the HPC46064. The
host initiates a data transfer by activating the HLD input of
the HPC46064. In response, the HPC46064 places its sys-
tem bus in a TRI-STATE Mode, freeing it for use by the host.
The host waits for the acknowledge signal (HLDA) from the
HPC46064 indicating that the sytem bus is free. On receiv-
ing the acknowledge, the host can rapidly transfer data into,
or out of, the shared memory by using a conventional DMA
controller. Upon completion of the message transfer, the
host removes the HOLD request and the HPC46064 re-
sumes normal operations.
To insure proper operation, the interface logic shown is rec-
ommended as the means for enabling and disabling the us-
er’s bus. Figure 28 illustrates an application of the shared
memory interface between the HPC46064 and a Series
32000 system.
TL/DD/11372–26
FIGURE 28. Shared Memory Application: HPC46064 Interface to Series 32000 System
25
相關PDF資料 |
PDF描述 |
|---|---|
| HPC46064 | High-Performance microController |
| HPC3130PBK | PCI Bus Interface/Controller |
| HPC3130PBM | PCI Bus Interface/Controller |
| HPC3130PGE | PCI Bus Interface/Controller |
| HPC467064 | High-Performance microController with a 16k UV Erasable CMOS EPROM |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HPC36064XXX/EL20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16-Bit Microcontroller |
| HPC36064XXX/EL30 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16-Bit Microcontroller |
| HPC36064XXX/T20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16-Bit Microcontroller |
| HPC36064XXX/T30 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16-Bit Microcontroller |
| HPC36064XXX/U20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16-Bit Microcontroller |
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