參數(shù)資料
型號： ISP1181
廠商： NXP Semiconductors N.V.
英文描述： Full-speed Universal Serial Bus Interface Device(全速通用串行總線接口器件)
中文描述： 全速通用串行總線接口設(shè)備（全速通用串行總線接口器件）
文件頁數(shù)： 17/69頁
文件大?。?/td> 1655K
代理商： ISP1181
Philips Semiconductors
ISP1181
Full-speed USB interface
Objective specification
Rev. 01 — 13 March 2000
17 of 69
9397 750 06896
Philips Electronics N.V. 2000. All rights reserved.
When reading from an OUT endpoint, reception of a short/empty packet at an OUT
token will stop the DMA operation after transferring the data bytes of this packet.
When writing to an IN endpoint, a short packet transferred at an IN token will stop the
DMA operation after all bytes have been transferred. If the number of bytes in the
buffer is zero, ISP1181 will automatically send an empty packet.
[1]
If short/empty packet EOT is enabled (SHORTP = 1 in DMA Configuration Register) and DMA
Counter Register is zero.
10.4.2
Isochronous endpoints
A DMA transfer to/from an isochronous endpoint can be terminated by any of the
following conditions (bit names refer to the DMA Configuration Register, see
Table 26
):
An external End-Of-Transfer signal occurs on input EOT
The internal DMA Counter Register reaches zero (CNTREN = 1)
An End-Of-Packet (EOP) signal is detected
DMA operation is disabled by clearing bit DMAEN.
10.4.3
DMA auto-restart
If the AUTOLD bit in the DMA Configuration Register is set, the DMA operation will
automatically restart when the last transfer has been completed. First the internal
DMA counter is reloaded from of the DMA Counter Register. Output DREQ is then
asserted to request a new DMA transfer for an IN endpoint, or when the buffer of an
OUT endpoint buffer has been filled.
Table 10: Summary of EOT conditions for a bulk endpoint
EOT condition
EOT input
DMA Counter Register
Short packet
OUT endpoint
EOT is active
counter reaches zero
short packet is received and
transferred
empty packet is received and
transferred
DMAEN = 0
IN endpoint
EOT is active
counter reaches zero
counter reaches zero in the
middle of the buffer
empty packet is automatically
appended when needed
[1]
DMAEN = 0
Empty packet
DMAEN bit in DMA
Configuration Register
Table 11: Recommended EOT usage for isochronous endpoints
EOT condition
OUT endpoint
EOT input active
do not use
DMA Counter Register zero
do not use
End-Of-Packet
preferred
IN endpoint
preferred
preferred
do not use
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISP1181A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Full-speed Universal Serial Bus peripheral controller
ISP1181ABS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Full-speed Universal Serial Bus peripheral controller
ISP1181ABS,518 功能描述:USB 接口集成電路 USB 1.1 ADV DEVICE RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1181ABS,551 功能描述:USB 接口集成電路 USB 1.1 ADVANCED DEVICE RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1181ABS,557 功能描述:USB 接口集成電路 DO NOT USE ORDER -S OR -T PART RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
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