參數(shù)資料
型號(hào): ISP1183
廠商: NXP Semiconductors N.V.
英文描述: Low-power Universal Serial Bus interface device with DMA
中文描述: 低功耗通用串行總線與DMA接口設(shè)備
文件頁(yè)數(shù): 21/62頁(yè)
文件大?。?/td> 295K
代理商: ISP1183
Philips Semiconductors
ISP1183
Low-power USB interface device with DMA
Product data
Rev. 01 — 24 February 2004
21 of 62
9397 750 11804
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
[1]
The DMA transfer stops. No interrupt, however, is generated.
11.4.2
Isochronous endpoints
A DMA transfer to or from an isochronous endpoint can be terminated by any of the
following conditions (for bit names refer to the DMA Configuration register in
Table 32
):
The DMA transfer completes as programmed in the DMA Counter register
(CNTREN = 1)
DMA operation is disabled by clearing bit DMAEN.
Table 10:
EOT condition
DMA Counter register
Summary of EOT conditions for a bulk endpoint
OUT endpoint
transfer completes as
programmed in the DMA
Counter register
Short packet
IN endpoint
transfer completes as
programmed in the DMA
Counter register
counter reaches zero in the
middle of the buffer
DMAEN = 0
[1]
short packet is received and
transferred
DMAEN = 0
[1]
DMAEN bit in DMA
Configuration register
Table 11:
EOT condition
DMA Counter register zero
Clear DMAEN bit
Recommended EOT usage for isochronous endpoints
OUT endpoint
do not use
preferred
IN endpoint
preferred
do not use
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