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LAN89730 датащи(PDF) 34 Page - Microchip Technology |
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LAN89730 датащи(HTML) 34 Page - Microchip Technology |
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34 / 218 page ![]() LAN89730 DS60001348A-page 34 2013-2015 Microchip Technology Inc. 4.3.1.3 Endpoint 3 (Interrupt) The Interrupt Endpoint is responsible for indicating device status at each polling interval. The Interrupt Endpoint is imple- mented via the CTL module. When the Endpoint is accessed, the Interrupt packet specified in Table 4-2 is presented to the host. If there is no interrupt status to report, the device responds with a NACK. The interrupt status can be cleared by writing to Interrupt Status Register (INT_STS). 4.3.1.4 Endpoint 0 (Control) The Control Endpoint is handled by the CTL (USB Control) module. The CTL module is responsible for handling USB standard commands, as well as USB vendor commands. In order to support these commands, the CTL must compile a variety of statistics and store the programmable portions of the USB descriptors. The supported USB commands can be found in Section 4.3.2, "USB Standard Commands". TABLE 4-2: INTERRUPT PACKET FORMAT Bits Description 31:20 RESERVED 19 MACRTO_INT 18 RX FIFO Has Frame. The RX FIFO has at least one complete Ethernet frame. 17 TXSTOP_INT 16 RXSTOP_INT 15 PHY_INT 14 TXE 13 TDFU 12 TDFO 11 RXDF_INT 10:0 GPIO_INT Note: The polling interval is static and set through the EEPROM. The host can change the polling interval by updating the contents of the EEPROM and resetting the part. |
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