參數(shù)資料
型號: ISP1181ABS
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: INDUCTOR 1.0NH +-.3NH FIXED SMD
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQCC48
封裝: 7 X 7 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT-619-2, HVQFN-48
文件頁數(shù): 19/70頁
文件大?。?/td> 341K
代理商: ISP1181ABS
Philips Semiconductors
ISP1181A
Full-speed USB peripheral controller
Product data
Rev. 05 — 08 December 2004
19 of 70
9397 750 13959
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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.
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 24
):
An external End-Of-Transfer signal occurs on input EOT
The DMA transfer completes as programmed in the DMA Counter register
(CNTREN = 1)
An End-Of-Packet (EOP) signal is detected
DMA operation is disabled by clearing bit DMAEN.
Table 10:
EOT condition
EOT input
DMA Counter Register
Summary of EOT conditions for a bulk endpoint
OUT endpoint
EOT is active
transfer completes as
programmed in the DMA
Counter register
Short packet
IN endpoint
EOT is active
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
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
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