![FabiaTech Low Power FB2503 Скачать руководство пользователя страница 75](http://html1.mh-extra.com/html/fabiatech/low-power-fb2503/low-power-fb2503_user-manual_3125681075.webp)
FabiaTech Corporation
69
DMA Channel Map
The equivalent of two 8237A DMA controllers are implemented in the FB2503 board.
Each controller is a four-channel DMA device that will generate the memory
addresses and control signals necessary to transfer information directly between a
peripheral device and memory. This allows high speeding information transfer with less
CPU intervention. The two DMA controllers are internally cascaded to provide four
DMA channels for transfers to 8-bit peripherals (DMA1) and three channels for transfers
to 16-bit peripherals (DMA2). DMA2 channel 0 provides the cascade interconnection
between the two DMA devices, thereby maintaining IBM PC/AT compatibility.
The following is the system information of DMA channels:
DMA Controller 1
DMA Controller 2
Channel 0: Spare
Channel 4: Cascade for
controller 1
Channel 1: Reserved for
IBM SDLC
Channel 5: Spare
Channel 2: Diskette
adapter
Channel 6: Spare
Channel 3: Spare
Channel 7: Spare
Содержание Low Power FB2503
Страница 6: ......
Страница 26: ...FabiaTech Corporation 20...
Страница 30: ...FabiaTech Corporation 24...
Страница 44: ...FabiaTech Corporation 38 Default setting Disable...
Страница 56: ...FabiaTech Corporation 50...