Sundance Technology
ST201
PRELIMINARY draft 2
RXDMABURSTTHRESH
Class | I/O Registers, DMA |
Base Address | IoBaseAddress register value |
Address Offset | 0x14 |
Access Mode | Read/Write |
Width | 8 bits |
RxDMABurstThresh sets the threshold when the ST201 makes RxDMA bus master requests, based upon the number of used bytes in the RxFIFO, in units of 32 bytes. When the used space exceeds the threshold, the ST201 may make a RxDMA request on the PCI bus. However, if the used space exceeds the current RxDMAFragLen, ST201 will make RxDMA bus request regardless of whether the used space exceeds the RxDMABurstThresh or not. RxDMABurstThresh may be overridden by the urgent request mechanism. See the PCI Bus Master Operation section for information about the relationship between RxDMABurst- Thresh and RxDMAUrgentThresh. A value of zero is invalid. RxDMABurstThresh defaults to 8, a threshold of 256 bytes.
BIT
7..0
BIT NAME
RxDMABurst- Thresh
BIT DESCRIPTION
The number of 32 byte words which must be present in the RxFIFO prior to the assertion of a RxDMA bus master request.
72
