器件名称: M-CAS-C8237
功能描述: PROGRAMMABLE DMA CONTROLLER ALTERA CORE
文件大小: 404.33KB 共5页
简 介:Enable/Disable control of individual DMA requests
C8237
Programmable DMA Controller Altera Core
Four, independent DMA channels Independent auto-initialization of all channels Memory-to-Memory transfers Memory block initialization Address increment of decrement Directly expandable to any number of channels
The C8237 Programmable DMA Controller core (C8237 core) is a peripheral interface circuit for microprocessor systems. The core is designed for use with an external, 8-bit address latch. It contains four independent channels and may be expanded to any number or channels by cascading additional controller chips. Each channel has a full 64K address and word count capability.
End of process input for terminating transfers Software DMA requests Independent polarity control for DREQ and DACK signals The C8237 was developed in HDL and synthesizes to approximately 5,500 gates depending on the technology used. Functionality based on the Intel 8237
Applications
The C8237 core is designed to improve system performance by allowing external devices to directly transfer information from the system memory.
Block Diagram
RESET CLK CSN READY IORNIN IOWNIN EOPNIN AEN ADSTB EOPNOUT MEMRN MEMWN IORNOUT IOWNOUT HLDA
16 Bit Decrementor Temp Word Count Reg Timing and Control
16 Bit Incrementor/ Decrementor Temp Address Reg
AOUT[7:0]
Channel-3
Channel-2
C8237REG
Channel-1 Channel-0
State Machine
Read/Write Current Word Count Register Write Base Word Count Register Base Word Address R……
