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M-CAS-C8237 Scheda tecnica(PDF) 1 Page - Altera Corporation |
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M-CAS-C8237 Scheda tecnica(HTML) 1 Page - Altera Corporation |
1 / 5 page C8237 Programmable DMA Controller Altera Core The C8237 Programmable DMA Controller core (C8237 core) is a peripheral inter- face 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 ex- panded to any number or channels by cascading additional controller chips. Each channel has a full 64K address and word count capability. Applications The C8237 core is designed to improve system performance by allowing external devices to directly transfer information from the system memory. Block Diagram Enable/Disable control of indi- vidual DMA requests Four, independent DMA chan- nels Independent auto-initialization of all channels Memory-to-Memory transfers Memory block initialization Address increment of decrement Directly expandable to any number of channels End of process input for termi- nating transfers Software DMA requests Independent polarity control for DREQ and DACK signals The C8237 was developed in HDL and synthesizes to ap- proximately 5,500 gates depending on the technology used. Functionality based on the Intel 8237 RESET Timing and Control CLK CSN AEN READY State Machine HLDA 16 Bit Decrementor Temp Word Count Reg 16 Bit Incrementor/ Decrementor Temp Address Reg C8237REG Fixed Priority and Rotating Priority Logic DREQ(3:0) HRQ DACK(3:0) Command Register Mask Register Request Register Mode Register Status Register Temporary Register DBIN(7:0) AIN[3:0] AOUT[7:0] EOPNOUT MEMRN ADSTB MEMWN IOWNOUT IORNOUT IORNIN IOWNIN EOPNIN DBOUT(7:0) Channel-0 Current Word Count Register Current Word Address Register Base Word Count Register Base Word Address Register Write Read/Write Channel-1 Channel-2 Channel-3 March 2004 |
Codice articolo simile - M-CAS-C8237 |
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Descrizione simile - M-CAS-C8237 |
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