- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378679 > MSM82C37B-5RS (OKI SEMICONDUCTOR CO., LTD.) Programmable DMA Controller(可編程DMA控制器) PDF資料下載
參數(shù)資料
| 型號： | MSM82C37B-5RS |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Programmable DMA Controller(可編程DMA控制器) |
| 中文描述： | 可編程DMA控制器（可編程DMA的控制器） |
| 文件頁數(shù)： | 20/33頁 |
| 文件大小： | 209K |
| 代理商： | MSM82C37B-5RS |
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頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁
20/33
Semiconductor
MSM82C37B-5RS/GS/VJS
Fixed Priority Mode
In fixed priority mode, channel 0 has the highest priority, followed by channels 1, 2, and 3 in that
order.
Rotating Priority Mode
In rotating priority mode, the order of priority is changed so that the channel where the current
DMA transfer has been completed is given lowest priority. This is to prevent any one channel
from monopolizing the system.
The fixed priority is regained immediately after resetting.
Service Terminated Channel
—
CH
0
CH
1
CH
2
CH
3
Priority Mode
Fixed
Order of Priority
for Next DMA
Highest
Lowest
CH
1
CH
2
CH
3
CH
0
CH
1
Rotating
CH
3
CH
0
CH
1
CH
2
CH
3
CH
2
CH
3
CH
0
CH
1
CH
2
CH
0
CH
1
CH
2
CH
3
CH
0
Table 1 MSM82C37B-5 Priority Decision Modes
Compressed Timing
Setting the MSM82C37B-5 to compressed timing mode enables the S
3
state used in extension of
the read pulse access time to be omitted (if permitted by system structure) for two or three clock
cycle DMA transfers. If the S
3
state is omitted, the read pulse width becomes the same as the
write pulse width with the address updated in S
2
and the read or write operation executed in
S
4
. This mode is disregarded if the transfer is a memory-memory transfer, transfer.
Extended Writing
When this mode is set, the
IOW
or
MEMW
signal which normally appears during the S
3
state
is obtained during the S
2
state, thereby extending the write pulse width. The purpose of this
extended write pulse is to enable the system to accomodate memories and I/O devices where
the access time is slower. Although the pulse width can also be extended by using READY, that
involves the insertion of a SW state to increase the number of states.
相關PDF資料 |
PDF描述 |
|---|---|
| MSM82C37B-5VJS | Programmable DMA Controller(可編程DMA控制器) |
| MSM82C51A-2(中文) | Universal Synchronous Asynchronous Receiver Transmitter(通用同步/異步接收發(fā)送器,同步通訊最高可達64Kbps,異步通訊最高可達38.4Kbps) |
| MSM82C51A-2 | Universal Synchronous Asynchronous Receiver Transmitter(通用同步/異步接收發(fā)送器,同步通訊最高可達64Kbps,異步通訊最高可達38.4Kbps) |
| MSM82C53-2 | Programmable Universal Timers(可編程中斷定時器,最高計數(shù)頻率8MHz) |
| MSM82C54-2 | Programmable Universal Timers(可編程中斷定時器,最高計數(shù)頻率10MHz) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MSM82C37B-5VJS | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:PROGRAMMABLE DMA CONTROLLER |
| MSM82C43 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:INPUT/OUTPUT PORT EXPANDER |
| MSM82C51A-2GS | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER |
| MSM82C51A-2GS-K | 制造商:OK International 功能描述:USART, 32 Pin, Plastic, SOP 制造商:OKI Semiconductor 功能描述:USART, 32 Pin, Plastic, SOP |
| MSM82C51A-2JS | 制造商:ROHM Semiconductor 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。