RZ/A2M SUB Board RTK79210XXB00000BE
2. Function specifications
R20UT4398EJ0100 Rev.1.00
2-31
2018.10.11
2.8
Reset Control
On RTK79210XXB00000BE, a reset signal from the reset IC on the RZ/A2M CPU board is input to the Ethernet
PHY1 (U27), Ethernet PHY2 (U28), and digital image input/output connector (CN15).
There are two types of system reset: power-on reset and switch-based reset.
Figure 2.8.1 shows a reset control block diagram.
Figure 2.8.1
Reset Control Block Diagram
CoreSight 20 connector (CN5)
TRST#
SRST #
3.3V
3.3V
3.3V
Reset switch (SW2)
Reset IC (U15)
RESET #
CT
SENSE
RZ/A2M (U1)
TRST#
RES#
EthernetPHY1 (U27)
PHYRSTB
EthernetPHY2 (U28)
PHYRSTB
RESET #
RPC_RESET #
RESET #
HM_RESET #
/OM_RESET #
3.3V
VDC6 connector
（
CN15
）
RES#
Note:
Red text
indicates a function used.
：
Indicates a function not implemented.
：
Indicates a SUB board.
3.3V
Serial flash memory (U2)
HyperMCP (U3)
+
U12
U13
U14
Reset IC output delay time
tpd=CT(nF)/175+0.5×10
-3
s=27.4ms
reset IC output test voltage
0.405×(Ra+Rb)/Rb=0.405×(130k
Ω+20kΩ)/20kΩ=3.04V
3.3V
130k
Ω
20k
Ω
4700pF
1000pF
