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ISP1161 Datasheet(PDF) 44 Page - NXP Semiconductors |
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ISP1161 Datasheet(HTML) 44 Page - NXP Semiconductors |
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44 / 127 page  Philips Semiconductors ISP1161 Full-speed USB single-chip host and device controller Product data Rev. 01 — 3 July 2001 44 of 130 9397 750 08313 © Philips Electronics N.V. 2001. All rights reserved. When the DMA controller terminates the DMA transfer by asserting EOT and Auto-reload mode is off, the buffer is also cleared (even if not all data are read) and the DMA handler is disabled automatically. For the next DMA transfer, the DMA controller as well as the DMA handler must be re-enabled. However in Auto-reload mode, the DMA handler will automatically restart by reasserting the DREQ2 line, without any loss of data. 11.3 Endpoint descriptions 11.3.1 Endpoints with programmable FIFO size Each USB device is logically composed of several independent endpoints. An endpoint acts as a terminus of a communication flow between the host and the device. At design time each endpoint is assigned a unique number (endpoint identifier, see Table 7). The combination of the device address (given by the host during enumeration), the endpoint number and the transfer direction allows each endpoint to be uniquely referenced. The ISP1161 has 16 endpoints: endpoint 0 (control IN and OUT) plus 14 configurable endpoints, which can be individually defined as interrupt/bulk/isochronous, IN or OUT. Each enabled endpoint has an associated FIFO, which can be accessed either via the parallel I/O interface or via DMA. 11.3.2 Endpoint access Table 7 lists the endpoint access modes and programmability. All endpoints support I/O mode access. Endpoints 1 to 14 also support DMA access. FIFO DMA access is selected and enabled via bits EPIDX[3:0] and DMAEN of the DMA Configuration Register. A detailed description of the DMA operation is given in Section 12. Table 7: Endpoint access and programmability Endpoint identifier FIFO size (bytes) Double buffering I/O mode access DMA mode access Endpoint type 0 64 (fixed) no yes no control OUT [1] 0 64 (fixed) no yes no control IN [1] 1 programmable supported supported supported programmable 2 programmable supported supported supported programmable 3 programmable supported supported supported programmable 4 programmable supported supported supported programmable 5 programmable supported supported supported programmable 6 programmable supported supported supported programmable 7 programmable supported supported supported programmable 8 programmable supported supported supported programmable 9 programmable supported supported supported programmable 10 programmable supported supported supported programmable 11 programmable supported supported supported programmable 12 programmable supported supported supported programmable 13 programmable supported supported supported programmable 14 programmable supported supported supported programmable |
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