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TPCE636 User Manual Issue 1.0.2
Page 72 of 104
I2C Bridge
7.13
The I2C bridge mode allows a unidirectional I2C bus BCC reach-through from the USER FPGA I2C Bus onto
the BCCs isolated management BCC I2C bus. In consequence of that, the two-independent busses behave
like one.
Unidirectional means in this context that only the SDA signal state is bidirectional (transferred to through the
BCC) but not the SCL. SCL only traverses from USER FPGA to management BCC I2C bus.
Having this feature active, allows accessing the TMP441 temperature sensor and the SI5338 clock generator
device. Both are accessible via their normal (original) I2C addresses.
Note that the Automatic Temperature Read Mode (TMP441_AUTO_TRD_EN) must be disabled before the
bridge mode can be enabled.
BCC
Kintex-7
I2C Bridge
Si5338
Clock
Generator
B
a
n
k
1
5
FPGA I2C
BCC I2C
TMP411
Temperature
Sensor
2
0
0
M
H
z
R
E
F
_
C
L
K
1
5
6
.2
5
M
H
z
Bank 115
C
L
K
_
M
G
T
Bank 33
8
8
.8
8
9
M
H
z
M
C
B
_
C
L
K
Bank 14
1
0
5
M
H
z
Figure 7-12 : User FPGA I2C to BCC I2C Bridge
For function description and register contents of the clock generator Si5338 and the temperature sensor
TMP411 please use the data sheets of the respective device.
Do not change the SI5338 Output driver properties like “Format and Voltage”
Channel 0 must be 3.3V LVDS
Channel 1 must be 3.3V SSTL on A and B
Channel 2 must be 3.3V CMOS on A and B
Channel 4 must be 3.3V SSTL on A and B
Do not change Si5338 Core VDD or I2C Bus Voltage
Core VDD = 3.3V
I2C Bus Voltage = 2.5V or 3.3V