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ISP1161ABD Datasheet(PDF) 89 Page - NXP Semiconductors |
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ISP1161ABD Datasheet(HTML) 89 Page - NXP Semiconductors |
89 / 134 page 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: Summary of EOT conditions for a bulk endpoint EOT condition OUT endpoint IN endpoint EOT input EOT is active EOT is active DcDMACounter register transfer completes as programmed in the DcDMACounter register transfer completes as programmed in the DcDMACounter register Short packet short packet is received and transferred counter reaches zero in the middle of the buffer DMAEN bit in DcDMAConfiguration register DMAEN = 0[1] DMAEN = 0[1] Table 74: Recommended EOT usage for isochronous endpoints EOT condition OUT endpoint IN endpoint EOT input active do not use preferred DMA Counter register zero do not use preferred End-Of-Packet preferred do not use |
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