Datasheet

31
3 TSB43AB23 1394 OHCI Controller Programming Model
This section describes the internal PCI configuration registers used to program the TSB43AB23 1394 open host
controller interface. All registers are detailed in the same format: a brief description for each register is followed by
the register offset and a bit table describing the reset state for each register.
A bit description table, typically included when the register contains bits of more than one type or purpose, indicates
bit field names, a detailed field description, and field access tags which appear in the type column. Table 31
describes the field access tags.
Table 31. Bit Field Access Tag Descriptions
ACCESS TAG NAME MEANING
R Read Field can be read by software.
W Write Field can be written by software to any value.
S Set Field can be set by a write of 1. Writes of 0 have no effect.
C Clear Field can be cleared by a write of 1. Writes of 0 have no effect.
U Update Field can be autonomously updated by the TSB43AB23 device.
Figure 31 shows a simplified block diagram of the TSB43AB23 device.