參數(shù)資料
型號: ISP1161ABM
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: Full-speed Universal Serial Bus single-chip host and device controller
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-414-1, LQFP-64
文件頁數(shù): 89/134頁
文件大?。?/td> 587K
代理商: ISP1161ABM
Philips Semiconductors
ISP1161A
Full-speed USB single-chip host and device controller
Product data
Rev. 03 — 23 December 2004
89 of 134
9397 750 13962
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
the DcDMACounter register. When the internal counter completes the transfer as
programmed in the DcDMACounter, an EOT condition is generated and the DMA
operation stops.
Short packet:
Normally, the transfer byte count must be set via a control endpoint
before any DMA transfer takes place. When a short packet has been enabled as EOT
indicator (SHORTP = 1), the transfer size is determined by the presence of a short
packet in the data. This mechanism permits the use of a fully autonomous data
transfer protocol.
When reading from an OUT endpoint, reception of a short packet at an OUT token
will stop the DMA operation after transferring the data bytes of this packet.
[1]
The DMA transfer stops. However, no interrupt is generated.
12.4.2
Isochronous endpoints
A DMA transfer to/from an isochronous endpoint can be terminated by any of the
following conditions (bit names refer to the DcDMAConfiguration register, see
Table 86
):
An external End-Of-Transfer signal occurs on input EOT
The DMA transfer completes as programmed in the DcDMACounter register
(CNTREN = 1)
An End-Of-Packet (EOP) signal is detected
DMA operation is disabled by clearing bit DMAEN.
Table 73:
EOT condition
EOT input
DcDMACounter register
Summary of EOT conditions for a bulk endpoint
OUT endpoint
EOT is active
transfer completes as
programmed in the
DcDMACounter register
Short packet
IN endpoint
EOT is active
transfer completes as
programmed in the
DcDMACounter 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
DcDMAConfiguration register
Table 74:
EOT condition
EOT input active
DMA Counter register zero
End-Of-Packet
Recommended EOT usage for isochronous endpoints
OUT endpoint
do not use
do not use
preferred
IN endpoint
preferred
preferred
do not use
相關(guān)PDF資料
PDF描述
ISP1161 Full-speed Universal Serial Bus single-chip host and device controller
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