參數(shù)資料
型號: W83C554F
英文描述: W83C554F Highly Integrated System I/O Controller for Power PC TM (South Bridge) & UltraDMA/33 IDE Controller QFP 208
中文描述: W83C554F高度集成的系統(tǒng)的I / O控制器的Power PC商標(biāo)(南橋)
文件頁數(shù): 92/159頁
文件大?。?/td> 3991K
代理商: W83C554F
W83C553F
Scatter/Gather Registers
Scatter/Gather (S/G) provides the capability of transferring multiple buffers between memory (ISA/PCI) and I/O (ISA DMA
device) without CPU intervention. In Scatter/Gather the DMA can read the memory address and word count from an array of
buffer descriptors located in system memory (PCI only), called the Scatter/Gather Descriptor (SCD) table. This allows the
DMA controller to sustain DMA transfers until all of the buffers in the SGD table are transferred.
Software prepares a SGD table in system memory. Each SGD is 8-bytes long and consists of an address pointer to the
starting address and the byte count (number of bytes) of the memory buffer to be transferred. In any given SGD table, two
consecutive SGDs are offset by 8-bytes and are aligned on a 4-byte boundary. Each SGD is defined below. For an 8-bit
DMA I/O device:
Electrical Specifications
WINBOND SYSTEMS LABORATORY
89
For a 16-bit DMA I/O device, bit 0 of the Memory Buffer Starting Address and byte count must be 0.
Bit 31 of Dword 1 is the end of Link Flag. Bus master operation terminates upon completion of the description entry that has
EOL set.
The SGD table cannot cross a 64k memory boundary.
The addresses of all of the registers located from 43Fh to 40Ah (except 40Bh) are relocatable by programming the
Scatter/Gather Relocation Base Address Register (Function 0, address 41h) in the PCI Configuration Space.
These registers
are marked with an asterisk (*).
相關(guān)PDF資料
PDF描述
W83L519D Peripheral Miscellaneous
W86C451 UART
W86C452 UART
W86F3448D LC86F3548A
W86F3448M LC86F3548A
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W83C554FY 制造商:Nuvoton Technology Corp 功能描述:I/O Controller Phase Controller 制造商:Nuvoton Technology 功能描述:I/O Controller Phase Controller
W83E14 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:SYSMAC-C20 MANUAL DX CODE ZA
W83L177R 制造商:WINBOND 制造商全稱:Winbond 功能描述:100MHZ 2-DIMM SDRAM BUFFER FOR NOTEBOOK
W83L197R-16 制造商:WINBOND 制造商全稱:Winbond 功能描述:2-CHIP 100MHZ CLOCK FOR BX NOTEBOOK
W83L351 制造商:WINBOND 制造商全稱:Winbond 功能描述:ExpressCard⑩ Power Interface Switch