82091AA Datasheet, PDF (58/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

82091AA
4 2 5 HARDWARE EXTENDED
CONFIGURATION MODE
The Hardware Extended configuration mode pro-
vides all of the features of the Hardware Basic con-
figuration mode Additional features in Hardware Ex-
tended configuration permit the user to select quan-
tity of floppy drives can be selected for either 2 or 4
floppy drive support The 82091AA operating volt-
age is selectable between 3 3V and 5V In addition
the parallel port can be configured to operate in ISA-
Compatible PS 2-Compatible or EPP modes Hard-
ware extended configuration provides these addi-
tional hardware configuration options by sampling
the pins on the serial ports at two different times
When RSTDRV is asserted the HC367 drives the
values on SOUTA RTSA DTRA SOUTB
RTSB and DTRB (Figure 22) When RTSDRV is
negated the HC367 is disabled and these serial port
signals are driven by HWEb pullup down resistors
The PPDIR GCS signal defaults to a game port
chip select (GCS ) To reconfigure the 82091AA
using software the 82091AA configuration mode
must be changed to SWAI mode (refer to AIPCFG1
register)
NOTE
3 3V operation is only available in the
82091AA
Figure 22 Hardware Extended Configuration
290486 – 22
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