Avago Technologies LSI53C1010 - Manual (Page 271)

SCSI SCRIPTS Processors 13-1
Chapter 13
New SCRIPTS
Processor Features
This chapter describes features found in the LSI Logic 64-bit chips with
the SCRIPTS processor. Features described include:
•
Section 13.1, “Improved FIFO Flushing,” page 13-1
•
Section 13.2, “Larger FIFO,” page 13-2
•
Section 13.3, “New ISTAT Registers,” page 13-2
•
Section 13.4, “New Scratch Registers,” page 13-2
•
Section 13.5, “New Load/Store Feature,” page 13-2
•
Section 13.6, “Phase Mismatch Handling,” page 13-3
•
Section 13.7, “64-Bit SCRIPTS Addressing,” page 13-6
Note: The chips covered in this section are the LSI53C895A,
LSI53C896, and the LSI53C10XX. Refer to
Table 1.1 for an
overview of their specifications.
13.1 Improved FIFO Flushing
During data in phase mismatches, the SCRIPTS processor flushes at the
programmed burst size until the available burst size is less than the
programmed burst size. When the flush completes, an interrupt is
generated. If the available burst size is less than the programmed value,
it flushes as it normally would, one Dword per PCI cycle. Enhanced
flushing is enabled and disabled in parallel with phase mismatch handling
but it can also be disabled independently.