Sundance-spas ST201 Manual de usuario descargar pdf (Pagina 80)

Sundance Technology ST201 PRELIMINARY draft 2

TXDMAPOLLPERIOD

Class....................I/O Registers, DMA

Base Address ......IoBaseAddress register value

Address Offset.....0x0a

Access Mode.......Read/Write

Width ...................8 bits

The value in TxDMAPollPeriod determines the interval at which the current TFD is polled. When a zero

TxDMANextPtr is fetched from the current TFD, TxDMANextPtr is polled to determine when a new TFD is

ready to be processed. Polling is disabled when TxDMAPollPeriod is cleared. TxDMAPollPeriod is cleared

by reset. The value in TxDMAPollPeriod represents a multiple of 320 ns time intervals. The maximum

value is 127 (or 40.64 us).

BIT BIT NAME BIT DESCRIPTION

6..0 TxDMAPollPeriod The number of 320ns intervals between polls of the TxDMANextPtr

field of the current TFD.

7 Unused This bit is ignored.

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 144 145

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Sundance-spas ST201 Manual de usuario Pagina 80