User’s Guide 15
&+,36
ABHiQV (Fab Rev. C)
Subject to Change Without Notice
Revision 1.1 7/15/98
The user can set the display memory type through XR41[0,1], memory size through XR42[2] and the DRAM
data bus width through XR43[4,5] for the B65555. The table below show the possible configurations:
Note: XR41 = 01h for EDO memory, XR42 = 00h for 256-wide column and XR43 = 10h for 64-bit interface.
6.2
STN-DD Buffer
Dual-drive LCD panels require video data alternating between two separate locations in memory. In addi-
tion, a dual-drive panel requires data from both locations simultaneously. These operations require a frame
storage area, called a ’STN-DD buffer’. The embedded STN-DD buffer may be enabled by setting
FR1A[0]=1.
6.3
Clock
The ABHiQV daughtercard provides two on-board oscillators U7 and U8. These external oscillators can be
used to provides DCLK and MCLK through pins TCLK and TDI respectively. By default, the graphics con-
troller’s internal synthesizers are used to generate the clock for DCLK and MCLK. The option of choosing
external oscillators vs. internal clocks may be controlled by XRCF[1,2]=0,0. The default state of these bits
reflects the state of pin AA4 (W1) during reset. It is recommended to leave W1 open and use XRCF register
to select the external oscillators. The purpose of W1 is related to testing and verification. See XRCF reg-
ister in the applicable databook for more detail. The value of the DCLK oscillator is up to the user to deter-
mine since it is based on panel resolution and other factors. Although oscillators of frequencies other than
14.318MHz may be used for MCLK, this is not recommended.
6.4
Utilities and Drivers
The SETCLK utility included in the utilities diskette independently programs MCLK and DCLK of the HiQVid-
eo
controller. The diskette normally shipped with the daughtercard also provides other utilities such as
MODETEST. The MODETEST utility runs all the standard VGA modes and super VGA modes. The driver
diskettes normally shipped with the daughtercard contain display drivers for various PC-based operating
systems including WIN95 and WinNT. These drivers are downloadable from CHIPS’ BBS, from which the
utilities can also be obtained -- please contact your CHIPS representative for more information. These driv-
ers are accompanied by text files to help you install them.
7.0
Troubleshooting
1.
Check that the ABHiQV daughtercard and DKHiQV-PCI main board are properly connected together.
2.
Ensure that 3.3V is set on DKHiQV-PCI main board.
3.
Verify that all other parts of the computer system are functioning properly by testing a known working
VGA board with the system.
4.
Make sure the combination of the DKHiQV-PCI main board and ABHiQV daughtercard works before
attaching the 65550 Multimedia daughtercard.
5.
If the 65550 Multimedia Daughtercard still does not work with DKHiQV-PCI, contact your CHIPS repre-
sentative.
Table 9: EDO Memory Configuration Types for B65555
EDO
SIZE
BANDWIDTH
ORGANIZATION
Qty. needed
Modules
2 MB
64-bit (single bank)
256Kx32
2
U3, U5
4 MB
64-bit (dual bank)
256Kx32
4
U3, U4, U5, U6
