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LAN9500AI データシート(PDF) 156 Page - Microchip Technology |
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LAN9500AI データシート(HTML) 156 Page - Microchip Technology |
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156 / 213 page  LAN950x DS00001875A-page 156 2010 - 2015 Microchip Technology Inc. 7.3.30 STRING DESCRIPTOR ATTRIBUTES REGISTER 1 (STRNG_ATTR1) This register is supported only by LAN9500A/LAN9500Ai. This register sets the length values for the named string descriptors that have been loaded into Descriptor RAM via the Data Port registers. The Descriptor RAM images may be used, in conjunction with this register, to facilitate customized operation when no EEPROM is present. Note 1: If a descriptor does not exist in Descriptor RAM, its size value must be written as 00h. 2: This register only affects system operation when an EEPROM is not present and the EEPROM Emulation Enable (EEM) bit indicates Descriptor RAM and the Attributes Registers are to be used for descriptor pro- cessing. 3: Writing to this register when an EEPROM is present is prohibited and will result in untoward operation and unexpected results. 4: This register is protected by Reset Protection (RST_PROTECT). Address: 0ACh Size: 32 bits Bits Description Type Default 31:8 RESERVED RO - 7:0 Interface String Descriptor Size (INTSTR_DESC_SIZE) R/W 00h |
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