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KC705 Evaluation Board
45
UG810 (v1.3) May 10, 2013
Feature Descriptions
lists the connections between the FPGA and the LCD header.
For more information about the Displaytech S162D LCD see
I2C Bus Switch
[
, callout
The KC705 board implements a single I
2
C port on the FPGA (IIC_SDA_MAIN,
IIC_SDA_SCL), which is routed through a TI PCA9548 1-to-8 channel I
2
C switch (U49).
The I
2
C switch can operate at speeds up to 400 kHz. The U49 bus switch at I
2
C address
0x74
/
0b01110100
must be addressed and configured to select the desired target
back-side device.
The KC705 board I
2
C bus topology is shown in
User applications that communicate with devices on one of the downstream I
2
C buses
must first set up a path to the desired bus through the U49 bus switch at I
2
C address
0x74
/
0b01110100
.
Table 1-23:
FPGA to LCD Header Connections
FPGA Pin
(U1)
Schematic Net
Name
LCD Header Pin
(J31)
AA13
LCD_DB4_LS
4
AA10
LCD_DB5_LS
3
AA11
LCD_DB6_LS
2
Y10
LCD_DB7_LS
1
AB13
LCD_RW_LS
10
Y11
LCD_RS_LS
11
AB10
LCD_E_LS
9
X-Ref Target - Figure 1-23
Figure 1-23:
I
2
C Bus Topology
PCA954
8
12C 1-to-
8
B
us
S
witch
CH7 -
S
I5
3
26_
S
DA/
S
CL
U49
IIC_
S
DA/
S
CL_MAIN
CH6 - IIC_
S
DA/
S
CL_DDR
3
CH5 - IIC_
S
DA/
S
CL_HDMI
CH4 -
S
FP_IIC_
S
DA/
S
CL
CH
3
- EEPROM_IIC_
S
DA/
S
CL
CH2 - FMC_LPC_IIC_
S
DA/
S
CL
CH1 - FMC_HPC_IIC_
S
DA/
S
CL
CH0 - U
S
ER_CLOCK_
S
DA/
S
CL
FPGA
B
a
nk 15
(2.5V)
U1
UG
8
10_C1_22_101012