RZ/A2M CPU Board RTK7921053C00000BE
2. Function specifications
R20UT4397EJ0100 Rev.1.00
2-24
2018.10.11
2.8
Reset Control
The reset IC in RTK7921053C00000BE controls the reset signal connected to the RZ/A2M, memory devices, and
connectors.
There are two types of system reset: power-on reset and switch reset.
Figure 2.8.1 shows the reset control block diagram.
Figure 2.8.1
Reset Control Block Diagram
To SUB board
CoreSight 20 connector (CN5)
TRST#
SRST #
3.3V
3.3V
3.3V
Reset switch (SW2)
Reset IC (U15)
RESET #
CT
SENSE
3.3V
130k
Ω
20k
Ω
4700pF
RZ/A2M (U1)
TRST#
RES#
RESET #
RPC_RESET #
RESET #
HM_RESET #
/OM_RESET #
3.3V
Note:
Red characters
indicate
functions in use.
: Unmounted.
3.3V
Serial flash memory (U2)
HyperMCP (U3)
+
U12
U13
U14
Reset
IC
output delay time
td=CT(nF)/175+0.5×10
-3
s=27.4ms
reset
IC
output detection voltage
0.405×(Ra+Rb)/Rb=0.405×(130k
Ω
+20k
Ω
)/20k
Ω
=3.04V
1000pF