Datasheet

4−4
4.1 OHCI Version Register
The OHCI version register indicates the OHCI version support and whether or not the serial EEPROM is present. See
Table 4−2 for a complete description of the register contents.
Type: Read only
Offset: 00h
Default: 0X01 0010h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Default 0 0 0 0 0 0 0 X 0 0 0 0 0 0 0 1
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Default 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
Table 4−2. OHCI Version Register Description
BIT FIELD NAME TYPE DESCRIPTION
31−25 RSVD R Reserved. Bits 31−25 return 0s when read.
24 GUID_ROM R The TSB82AA2B device sets bit 24 to 1 if the serial EEPROM is detected. If the serial EEPROM is
present, the Bus_Info_Block is automatically loaded on system (hardware) reset.
23−16 version R Major version of the OHCI. The TSB82AA2B device is compliant with the 1394 Open Host Controller
Interface Specification (Revision 1.1); thus, this field reads 01h.
15−8 RSVD R Reserved. Bits 15−8 return 0s when read.
7−0 revision R Minor version of the OHCI. The TSB82AA2B device is compliant with the 1394 Open Host Controller
Interface Specification (Revision 1.1); thus, this field reads 10h.
4.2 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 4.1, OHCI Version Register) is set to 1. See Table 4−3 for a complete
description of the register contents.
Type: Read/Set/Update, Read/Update, Read only
Offset: 04h
Default: 00XX 0000h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
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
Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Table 4−3. 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 TSB82AA2B device completes
the reset, it clears this bit. The TSB82AA2B device does not automatically fill bits 23−16 (rdData field)
with the 0 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 TSB82AA2B device 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 represents the data read from the GUID ROM.
15−8 RSVD R Reserved. Bits 15−8 return 0s when read.
7−0 miniROM R Mini ROM. The TSB82AA2B device uses bits 7−0 to indicate the first byte location of the mini-ROM
image in the GUID ROM. A value of 00h in this field indicates that no mini ROM is implemented.