LAN9500AI datasheet(155/213 Pages) MICROCHIP

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DS00001875A-page 155

LAN950x

7.3.29

STRING DESCRIPTOR ATTRIBUTES REGISTER 0 (STRNG_ATTR0)

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:

0A8h

Size:

32 bits

Bits

Description

Type

Default

31:24

Configuration String Descriptor Size (CFGSTR_DESC_SIZE)

R/W

00h

23:16

Serial Number String Descriptor Size (SERSTR_DESC_SIZE)

R/W

00h

15:8

Product Name String Descriptor Size (PRODSTR_DESC_SIZE)

R/W

00h

7:0

Manufacturing String Descriptor Size (MANUF_DESC_SIZE)

R/W

00h

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