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HOST
CONTROLLER
USB
KEYBOARD
OTHER USB
DEVICE
USB
MOUSE
USB
HUB
PC
1
PC
2
PC
3
PC
4
USB
HUB
USB
HUB
USB
HUB
EMULATION
ENGINE
True Emulation is not necessarily required by other USB devices, which is why you will also find two enumerated circuits included
(shown in green within the block diagram) alongside the True Emulation feature (shown in blue). This allows those other USB devices
to operate at their highest speeds, without any intervention. The enumerated circuits benefit greatly from the USB Hubs that are
jointly used with the True Emulation system. Because they interface directly and permanently with each computer, they help to sta-
bilize the dormant links, making errors during enumeration much less likely.
The dual switching arrangement provides further flexibility because the True Emulation and enumerated sections can be switched
in unison or independently of each other, as required. Thus, your various peripherals can operate with different computers at the
same time.
Figure B-1. True Emulation functional block diagram. The emulated section of the switch is shown in blue and
handles only the keyboard and mouse. The green enumerated section of the switch handles other USB devices
and also uses the USB hubs to link with the computers.
