Xilinx Virtex-4 ML455, User Manual

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Virtex-4 ML455 PCI/PCI-X Board www.xilinx.com 19
UG084 (v1.0) May 17, 2005
General-Purpose I/O and LCD Header
R
General-Purpose I/O and LCD Header
P11 is a 2 x 9 male pin header providing two functions:
•
General-purpose I/O header for logic analysis and so forth. Fifteen of the 16 test pins
(TEST[16:1]) are wired directly to the U10 LX25 Bank 9 I/O pins. Signal TEST1 is
wired to P11.3 using a 0
Ω
resistor R243. This resistor is typically removed when P11 is
used to support LCD operation (described below). There are no pull-up or pull-down
resistors on these test signals. When this header is used in this (general-purpose)
mode, P11 pins 1 and 2 normally are unused. R243 (0
Ω)
is installed, and R244 and
R245 are removed.
•
Optional LCD support mode. The signals wired to P11 can optionally be assigned
LCD interface functions. The 2 x 9 header is pinned out to match most standard LCD
modules. P11 pins 1 and 2 can each be wired to either GND or V
CC
. V
CC
is selected
from an array of available voltages via the placement of a 0
Ω
resistor (one only) at
locations R252 (5V) or R253 (3.3V) or R254 (SKT_VCCO). SKT_VCCO can be either
3.0V or 2.5V, selected at the 3-pin header P18. For the LCD mode, R243 is removed,
and R244 and R245 are installed to provide the LCD contrast voltage required by most
LCD modules. The values of R244 and R245 are calculated for a specific LCD display,
since LCD displays have different LCD_DRIVE contrast voltage settings.
Figure 3-4 shows the P11 header with one possible, optional LCD signal assignment.
Table 3-8 lists the pinout of the P11 header for both General-Purpose and LCD modes.
Figure 3-4: P11 Header
Table 3-8: General-Purpose Header P11
Signal Name
P11 Pin # FPGA Pin #
GP Mode LCD Mode
GND VCC or GND 1 no connect
VCC VCC or GND 2 no connect
test1 LCD_DRIVE 3 N21
test2 LCD_DATA7 4 N20
test3 LCD_DATA6 5 P24
test4 LCD_DATA5 6 P23
test5 LCD_DATA4 7 P20
P11
1
3
5
7
9
11
13
15
17
TEST3
TEST5
TEST7
TEST9
TEST11
TEST13
TEST15
TEST1
R244
R243
0
DNA
DNA
DNA
TEST2
TEST4
TEST6
TEST8
TEST10
TEST12
TEST14
TEST16
2
4
6
8
10
12
14
16
18
R249
R248
5V 3.3V SKT_VCCO
R251
R250
R245
DNA
R252
DNA
R253
DNA
R254
0
UG084_c3_05_042605
C306
0.1
µ
F
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