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LAN9500A Datasheet(PDF) 30 Page - Microchip Technology |
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LAN9500A Datasheet(HTML) 30 Page - Microchip Technology |
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30 / 213 page  LAN950x DS00001875A-page 30 2010 - 2015 Microchip Technology Inc. 5.3.1.3 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 5-2 is presented to the Host. If there is no interrupt status to report, the device responds with a NAK. The interrupt status can be cleared by writing to Interrupt Status Register (INT_STS) on page 119. 5.3.1.4 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 5.3.2, "USB Standard Commands," on page 37. 5.3.1.5 USB Command Processing The UDC is programmed to decode USB commands. After a standard command is decoded by the UDC, it may be passed to the CTL for completion. The CTL is responsible for implementing the Get Descriptor and vendor commands. In order to implement the Get Descriptor command for string descriptors, the CTL manages a 128x32 register file which stores the string values for Language ID, Manufacturer ID, Product ID, Serial Number, Configuration, and Interface. The RAM’s contents is initialized via the EEPROM, after a system reset occurs. When the UDC decodes a Get Descriptor command, it will pass a pointer to the CTL. The CTL uses this pointer to deter- mine what the command is and how to fill it. TABLE 5-2: 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. TABLE 5-3: STRING DESCRIPTOR INDEX MAPPINGS Index String Name 0 Language ID 1 Manufacturer ID 2 Product ID 3 Serial Number 4 Configuration String 5 Interface String |
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