Hardware Design Specification
ASD-B-16-0247 Rev1.3
Page 45 of 105
September 8, 2017
RTK00V2XRC7746SFS
3.17
Clock system
The Tethys board uses the crystal oscillators and resonators shown below.
3.17.1
Clock Signals Supplied to the R-Car W2H
Table 21 List of Clock Signals and Crystals for the R-Car W2H
NO.
Xn
Supply voltage
R-Car W2H pin name
Frequency
Description
Part number
Manufacturer
Type
1
X1
3.3V
GP1_22/EX_WAIT0/CAN_
CLK_B/SCIF_CLK_A
14.7456MHz
SCIF clock
SG-8003CE14.7456
00MHzPCL
Epson
Oscillator
2
X2
3.3V
GP3_11/RX0_B/SCL0_C/A
VB_GTXREFCLK/ETH_M
DC
125.00MHz
AVB_GTXREF
CLK
SG-8003CE125.000
000MHzPCL
Epson
Oscillator
3
Y1
USB_XTAL ,
USB_EXTAL
48MHz
USB clock
FA-238A48.000MH
z10
Epson
Crystal
4
Y2
-
XTAL , EXTAL
20.00MHz
CPU main clock
FA-238A20.000000
MHz10
Epson
Crystal
3.17.2
Differential Clock Signals Supplied to the R-Car W2H
Table 22 List of Differential Clock Signals Supplied to the R-Car W2H
NO.
R-Car W2H Pin Assignment
R-Car W2H pin name
Clock Driver Pin Name
Signal Type
1
AC12
CLKP
REFCLK-
Differential signal
2
AB12
CLKN
3.17.3
Clock Signals Supplied to Devices Other than R-Car W2H
Table 23 List of Clocks and Crystals other than for R-Car W2H
NO.
Xn
Device
Device pin name
Frequency
Description
Part number
Manufacturer
Type
1
X3
AK4642EN
MCKI
12.288MHz
Audio Clock
SG-8003CE12.2880
00MHzPCL
Epson
Oscillator
2
Y3
GL852GT(USB Hub)
X1 , X2
12MHz
USB Hub Clock
FA-238A12.000000
MHz10
Epson
Crystal
3
Y4
KSZ8041RNLI
XI , XO
25MHz
Ethernet clock
FA-238A25.0000M
Hz18
Epson
Crystal
4
Y5
RH850F1H/F1L
X1 , X2
12MHz
MCU main clock
FA-238A12.000000
MHz10
Epson
Crystal
5
Y6
RH850F1H/F1L
XT1 , XT2
32.768kHz
MCU sub clock
FC-13A32.768000k
Hz12.5
Epson
Crystal
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