- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371881 > HPC-DEV-WDBC (National Semiconductor Corporation) High-Performance microController with A/D PDF資料下載
參數(shù)資料
| 型號： | HPC-DEV-WDBC |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High-Performance microController with A/D |
| 中文描述： | 高性能微控制器/數(shù) |
| 文件頁數(shù)： | 28/39頁 |
| 文件大?。?/td> | 430K |
| 代理商： | HPC-DEV-WDBC |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁當前第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁
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 HPC46164
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 HPC46164. The
host initiates a data transfer by activating the HLD input of
the HPC46164. In response, the HPC46164 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
HPC46164 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 HPC46164 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 29 illustrates an application of the shared
memory interface between the HPC46164 and a Series
32000 system.
TL/DD/9682–31
FIGURE 29. Shared Memory Application: HPC46164 Interface to Series 32000 System
28
相關PDF資料 |
PDF描述 |
|---|---|
| HPC46004VF20 | High-Performance microController with A/D |
| HPC36104 | High-Performance microController with A/D |
| HPC36164 | High-Performance microController with A/D |
| HPC-DEV-ISE-E | High-Performance microController with A/D |
| HPC-DEV-ISE4 | High-Performance microController with A/D |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HPCI-13S4LU | 功能描述:模塊配件 ISAx7 PCIx4 PICMGx3 BACKPLANE AT/ATX PSU RoHS:否 制造商:Lantronix 產(chǎn)品: 用于: |
| HPCI-14S/ATX | 功能描述:模塊配件 ISAx8 PCIx4 PICMGx2 BACKPLANE RoHS:否 制造商:Lantronix 產(chǎn)品: 用于: |
| HPCI-14S12U | 功能描述:模塊配件 ISAx1 PCIx12 PICMGx2 BACKPLANE AT/ATX PSU RoHS:否 制造商:Lantronix 產(chǎn)品: 用于: |
| HPCI-14S7U | 功能描述:模塊配件 ISAx4 PCIx7 PICMGx3 BACKPLANE AT/ATX PSU RoHS:否 制造商:Lantronix 產(chǎn)品: 用于: |
| HPCI-15S | 功能描述:模塊配件 ISAx9 PCIx4 PICMGx2 BACKPLANE RoHS:否 制造商:Lantronix 產(chǎn)品: 用于: |
發(fā)布緊急采購，3分鐘左右您將得到回復。