Datasheet

Feature/Protocol Descriptions
37
March 5 2007 − June 2011 SCPS154C
Table 3−14. 1394a OHCI Memory Command Options
PCI
COMMAND
C/BE3
–C/BE0
OHCI MASTER FUNCTION
Memory read 0110 DMA read from memory
Memory write 0111 DMA write to memory
Memory read multiple 1100 DMA read from memory
Memory read line 1110 DMA read from memory
Memory write and invalidate 1111 DMA write to memory
3.12.5 1394a OHCI Subsystem Identification
The subsystem identification register at offset 2Ch is used for system and option card identification purposes.
This register can be initialized from the serial EEPROM or programmed via the subsystem access register
at offset F8h in the 1394a OHCI PCI configuration space (see Section 7.24).
Write access to the subsystem access register updates the subsystem identification registers identically to
OHCI-Lynx™. The contents of the subsystem access register are aliased to the subsystem vendor ID and
subsystem ID registers at PCI offsets 2Ch and 2Eh, respectively. The subsystem ID value written to this
register may also be read back from this register.
3.12.6 1394a OHCI PME Support
Since the 1394a OHCI controller is not connected to VAUX, PME generation is disabled for D3
cold
power
management states.
Not Recommended for New Designs