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8−5
8.2 GUID ROM Register
The GUID ROM register accesses the serial EEPROM, and is only applicable if bit 24 (GUID_ROM) in the OHCI
version register at OHCI offset 00h (see Section 8.1) is set to 1. See Table 8−3 for a complete description of the
register contents.
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Name GUID ROM
Type RSU R R R R R RSU R RU RU RU RU RU RU RU RU
Default 0 0 0 0 0 0 0 0 X X X X X X X X
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name GUID ROM
Type R R R R R R R R R R R R R R R R
Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Register: GUID ROM
Offset: 04h
Type: Read/Set/Update, Read/Update, Read-only
Default: 00XX 0000h
Table 8−3. GUID ROM Register Description
BIT FIELD NAME TYPE DESCRIPTION
31 addrReset RSU Software sets bit 31 to 1 to reset the GUID ROM address to 0. When the PCI7x21/PCI7x11 controller
completes the reset, it clears this bit. The PCI7x21/PCI7x11 controller does not automatically fill bits
23−16 (rdData field) with the 0
th
byte.
30−26 RSVD R Reserved. Bits 30−26 return 0s when read.
25 rdStart RSU A read of the currently addressed byte is started when bit 25 is set to 1. This bit is automatically cleared
when the PCI7x21/PCI7x11 controller completes the read of the currently addressed GUID ROM byte.
24 RSVD R Reserved. Bit 24 returns 0 when read.
23−16 rdData RU This field contains the data read from the GUID ROM.
15−8 RSVD R Reserved. Bits 15−8 return 0s when read.
7−0 miniROM R The miniROM field defaults to 00h indicating that no mini-ROM is implemented. If an EEPROM is
implemented, then all 8 bits of this miniROM field are downloaded from EEPROM word offset 28h. For
this device, the miniROM field must be greater than ??h to indicate a valid miniROM offset into the
EEPROM.