CMOS High Performance Programmable DMA Controller The IS82C37A is a high-performance programmable DMA controller manufactured by Harris Semiconductor. Below are its specifications, descriptions, and features based on Ic-phoenix technical data files:
### **Specifications:**
- **Manufacturer:** Harris Semiconductor
- **Type:** DMA (Direct Memory Access) Controller
- **Technology:** CMOS
- **Operating Voltage:** 5V
- **Operating Temperature Range:** Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)
- **Package:** 40-pin DIP (Dual In-line Package) or PLCC (Plastic Leaded Chip Carrier)
- **Clock Frequency:** Up to 8 MHz
- **Number of Channels:** 4 independent DMA channels
- **Data Bus Width:** 8-bit
- **Addressing Capability:** 16-bit (supports 64KB address space per channel)
### **Descriptions:**
- The IS82C37A is a CMOS version of the industry-standard 8237 DMA controller, offering improved performance and lower power consumption.
- It facilitates high-speed data transfers between memory and I/O devices without CPU intervention.
- Each of the four channels can be independently programmed for different transfer modes.
- Compatible with Intel’s 8237A, ensuring backward compatibility with existing designs.
### **Features:**
- **Four Independent DMA Channels:** Supports memory-to-memory, memory-to-I/O, and I/O-to-memory transfers.
- **Programmable Priority:** Fixed or rotating priority modes.
- **Multiple Transfer Modes:** Includes single transfer, block transfer, demand transfer, and cascade mode.
- **Auto-Initialization:** Allows channels to reload initial parameters automatically after transfer completion.
- **Memory-to-Memory Transfer:** Channel 0 and Channel 1 can be used for memory-to-memory transfers.
- **Mask Control:** Individual channel masking and a master disable function.
- **Extended Temperature Options:** Available in commercial and industrial temperature ranges.
- **Low Power Consumption:** CMOS technology ensures reduced power usage compared to NMOS versions.
This information is strictly based on the available knowledge base for the IS82C37A DMA controller by Harris Semiconductor.
