Specifications

xii 9 March 1999 – Subject To Change
Data Units
The following data-unit terminology is used throughout this manual.
Note
Notes emphasize particularly important information.
Numbering
All numbers are decimal or hexadecimal unless otherwise indicated. The prefix 0x
indicates a hexadecimal number. For example, 19 is decimal, but 0x19 and 0x19A
are hexadecimal (also see Addresses). Otherwise, the base is indicated by a sub-
script; for example, 100
2
is a binary number.
Ranges and Extents
Ranges are specified by a pair of numbers separated by two periods (..) and are inclu-
sive. For example, a range of integers 0..4 includes the integers 0, 1, 2, 3, and 4.
Extents are specified by a pair of numbers in angle brackets (< >) separated by a
colon (:) and are inclusive. Bit fields are often specified as extents. For example, bits
<7:3> specifies bits 7, 6, 5, 4, and 3.
Register and Memory Figures
Register figures have bit and field position numbering starting at the right (low
order) and increasing to the left (high order).
Memory figures have addresses starting at the top and increasing toward the bottom.
Schematic References
Logic schematics are included in the AlphaPC 164LX design package. In this man-
ual, references to schematic pages are printed in italics. For example, the following
specifies schematic page 4:
“. . . the configuration jumpers (pc164lx.4) provide . . .”
Term Words Bytes Bits Other
Byte ½1 8—
Word 1 2 16 —
Longword/Dword 2 4 32 Longword
Quadword 4 8 64 2 Longwords
Octaword 8 16 128 2 Quadwords
Hexword 16 32 256 2 Octawords