TOSHIBA USIO21 controller PLC module

TOSHIBA USIO21 controller PLC module

Technical data of product parameters

The PPC Master incorporates an optional operating mode called Bus Hog.
When Bus Hog is enabled, the PPC Master continually requests the PPC USIO21
bus for the entire duration of each PCI transfer. When Bus Hog is not
enabled, the PPC Master structures its bus request actions according to the
requirements of the FIFO. The Bug Hog mode was primarily designed to
assist with system level debugging and is not intended for normal modes USIO21
of operation. It is a brute force method of guaranteeing that all PCI to
PPC60x transactions will be performed without any intervention by host
CPU transactions. Caution should be exercised when using this mode since
the over-generosity of bus ownership to the PPC Master can be detrimental
to the host CPU’s performance. The Bus Hog mode can be controlled by
the XMBH bit within the GCSR. The default state for XMBH is disabled.
The PHB has an internal PPC60x bus arbiter. The use of this arbiter is
optional. If the internal arbiter is disabled, then the PHB must be allowed USIO21
to participate in an externally implemented PPC60x arbitration
mechanism. The selection of either internal or external PPC arbitration
mode is made by sampling an RD line at the release of reset. Refer to the
section titled PHB Hardware Configuration in this chapter for more
information.
The PHB has been designed to accommodate up to four PPC60x bus
masters, including itself (HAWK), two processors (CPU0/CPU1), and an USIO21
external PPC60x master (EXTL). EXTL can be a L2 cache, a second
bridge chip, etc. When the PPC Arbiter is disabled, PHB generates an
external request and listen for an external grant for itself. It also listens to
the other external grants to determine the PPC60x master identification
field (XID) within the GCSR. When the PPC Arbiter is enabled, the PHB
receives requests and issue grants for itself and for the other three bus
masters. The XID field is determined by the PPC Arbiter.

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