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LH79524/LH79525 User's Guide
Glossary
UART
Universal Asynchronous Receiver and Transmitter
USB
Universal Serial Bus
USB Hub
A device that provides additional connections to the USB.
VBP
Vertical Back Porch. The quantity of inactive lines at the start of a frame, after the vertical
synchronization period.
Vectored Interrupt Controller
A Vectored Interrupt Controller (VIC) allows hardware to automatically assign
addresses (vectors) for system interrupts, increasing interrupt servicing speed. The
LH79524/LH79525 provides up to 16 vectored interrupts, and also allows prioritizing
interrupts as well as assigning interrupts as IRQs or FIQs.
VFP
Vertical Front Porch. The quantity of inactive lines at the end of a frame, before the vertical
synchronization period.
VLAN
Virtual LAN. A logical, not physical, group of devices, defined by software. VLANs allow
network administrators to resegment their networks without physically rearranging the
devices or network connections. Workstations on different LANs can be connected using
VLAN tagging, where 'tags' are assigned to the frames transmitted by devices.
Volatile Memory
A general term for any memory technology that loses its contents when power is removed.
Examples are RAM, SRAM, and SDRAM. See Non-Volatile Memory.
VSW
Vertical Synchronization (Pulse) Width. The quantity of horizontal synchronization lines fed to
an LCD panel during its reset time from the bottom of the frame to the top of the next frame.
WDT
Watchdog Timer
WO
Write Only. Write Only fields should not be read as the data is invalid.
Word
In the 32-bit LH79524/LH79525, a 32-bit data element structured as an ordered sequence.
Words in this User's Guide are shown with the most significant byte on the left (or top) and
the least significant byte on the right (or bottom). Also see Byte, Half Word, and Nibble.
Version 1.0
20-7
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