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NUC220-LE1N Fiches technique(PDF) 69 Page - Nuvoton Technology Corporation

No de pièce NUC220-LE1N
Description  ARM짰 Cortex짰-M 32-bit Microcontroller
Download  107 Pages
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
Logo NUVOTON - Nuvoton Technology Corporation

NUC220-LE1N Fiches technique(HTML) 69 Page - Nuvoton Technology Corporation

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NUC100/120xxxDN
Aug 31, 2015
Page 69 of 107
Rev 1.01
PDMA Controller (PDMA)
6.7
6.7.1
Overview
The NuMicro
®
NUC100 series DMA contains nine-channel peripheral direct memory access
(PDMA) controller and a cyclic redundancy check (CRC) generator.
The PDMA that transfers data to and from memory or transfer data to and from APB devices. For
PDMA channel (PDMA CH0~CH8), there is one-word buffer as transfer buffer between the
Peripherals APB devices and Memory. Software can stop the PDMA operation by disable PDMA
PDMA_CSRx[PDMACEN]. The CPU can recognize the completion of a PDMA operation by
software polling or when it receives an internal PDMA interrupt. The PDMA controller can
increase source or destination address or fixed them as well.
The DMA controller contains a cyclic redundancy check (CRC) generator that can perform CRC
calculation with programmable polynomial settings. The CRC engine supports CPU PIO mode
and DMA transfer mode.
6.7.2
Features
Supports nine PDMA channels and one CRC channel. Each PDMA channel can support
a unidirectional transfer
AMBA AHB master/slave interface compatible, for data transfer and register read/write
Hardware round robin priority scheme. DMA channel 0 has the highest priority and
channel 8 has the lowest priority
PDMA operation
– Peripheral-to-memory, memory-to-peripheral, and memory-to-memory transfer
– Supports word/half-word/byte transfer data width from/to peripheral
– Supports address direction: increment, fixed.
Cyclic Redundancy Check (CRC)
– Supports four common polynomials CRC-CCITT, CRC-8, CRC-16, and CRC-32
CRC-CCITT: X
16 + X12 + X5 + 1
CRC-8: X
8 + X2 + X + 1
CRC-16: X
16 + X15 + X2 + 1
CRC-32: X
32 + X26 + X23 + X22 + X16 + X12 + X11 + X10 + X8 + X7 + X5 + X4 + X2 + X + 1
– Supports programmable CRC seed value.
– Supports programmable order reverse setting for input data and CRC checksum.
– Supports
programmable 1’s complement setting for input data and CRC checksum.
– Supports CPU PIO mode or DMA transfer mode.
– Supports the follows write data length in CPU PIO mode
8-bit write mode (byte): 1-AHB clock cycle operation.
16-bit write mode (half-word): 2-AHB clock cycle operation.
32-bit write mode (word): 4-AHB clock cycle operation.
– Supports byte alignment transfer data length and word alignment transfer source
address in CRC DMA mode.


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