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參數(shù)資料
| 型號： | PT7A6525L |
| 英文描述： | 60V Single N-Channel HEXFET Power MOSFET in a TO-247AC package |
| 中文描述： | 雙通道協(xié)議控制器？ |簡介？（PDF格式） |
| 文件頁數(shù)： | 34/41頁 |
| 文件大?。?/td> | 1640K |
| 代理商： | PT7A6525L |
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4
PT Pericom Technology Inc.
The Demo Board of PT7A6525
in DMA Mode
Introduction
This application note provides a simplified application
of PT7A6525 in DMA mode. DMA mode provides
higher data block transfer rate between PT7A6525
HDLC channel and system memory, and needs less
CPU control in data block transferring than in Inter-
rupt Request mode.
In DMA mode, the circuit designment is more com-
plex. This demo board shows a typical circuit which
can implement the fundamental functions of DMA in-
terface in an application system.
This application mainly describes the function block
of the demo board and the principle of PT7A6525
DMA interface, which includes the DMA transferring
process of PT7A6525, the programming of DMA con-
troller and PT7A6525, and the program flow of CPU
to implement the transmitting or receiving process of a
HDLC frame.
This application note provides the User Manual of the
demo program, too.
Function Description
Figure 2 shows the function block diagram of the demo
board of PT7A6525 in DMA mode. The figure shows
the main function block and some important signals
between them.
According to Figure 2, the function blocks connected
to system bus respectively. There are some other sig-
nals to implement control function. Because the CPU
is MC68HC000, which is a 16-bit microprocessor, the
width of the databus in system bus is 16-bit. The con-
trol bus is in Intel Bus Mode, so the control signals of
MC68HC000 can not connect to system bus directly.
The EPLD adapts these signals.
The principles of the function blocks will be described
in the following parts.
PT7A6525
CPU
DMA
Controller
Clock
RAM
ROM
System Bus
INT
DREQ
DACK
EPLD
Control
Signals
RS232
Interface
To PC
TxD
RxD
Figure 2. Function Block Diagram
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相關代理商/技術參數(shù) |
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| PT7A6526 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-channel Protocol Controller? | User＇s manual for PT7A6525(6) demo system in interrupt mode?(PDF) |
| PT7A6527 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Quad-channel Protocol Controller? | Demo board Schematic and Program?(PDF) |
| PT7A6632 | 制造商:PERICOM 制造商全稱:Pericom Semiconductor Corporation 功能描述:PT7A6632 32-Channel HDLC Controller |
| PT7A6632J | 制造商:PERICOM 制造商全稱:Pericom Semiconductor Corporation 功能描述:PT7A6632 32-Channel HDLC Controller |
| PT7A7511 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4.63V Reset Active Low Supervisor? |
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