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TMPR4925 bảng dữ liệu(PDF) 171 Page - Toshiba Semiconductor

tên linh kiện TMPR4925
Giải thích chi tiết về linh kiện  64-Bit TX System RISC TX49 Family
PDF  590 Pages
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nhà sản xuất  TOSHIBA [Toshiba Semiconductor]
Trang chủ  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TMPR4925 bảng dữ liệu(HTML) 171 Page - Toshiba Semiconductor

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Chapter 8 DMA Controller
8-1
8.
DMA Controller
8.1
Features
The TX4925 contains a four-channel DMA Controller (DMAC) that executes DMA (Direct Memory
Access) with memory and I/O devices.
The DMA Controller has the following characteristics.
•
Has four on-chip DMA channels
•
Supports external I/O devices with 8-, 16-, and 32-bit Data Bus widths and transfer between memory
devices.
•
Supports single address transfer (Fly-by DMA) and dual address transfer when in the external I/O DMA
Transfer Mode that is operated by external request signals
•
Supports on-chip Serial I/O Controllers and AC-Link Controllers
•
Supports Memory-Memory Copy modes that do not have address boundary limitations. Burst transfer of
up to eight words is possible for each Read or Write operation.
•
Supports Memory Fill mode that writes word data to the specified memory region
•
Supports Chained DMA Transfer
•
On-chip signed 24-bit address count up registers for both the source address and destination address
•
On-chip 26-bit Byte Count Register for each channel
•
One of two methods can be selected for determining access priority among multiple channels: Round
Robin or Fixed Priority
•
Big Endian or Little Endian mode can be set separately for each channel



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