Verdin Carrier Board Design Guide
Preliminary
– Subject to Change
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2.19.3
Unused JTAG Signal Termination
Unused JTAG signals can be left unconnected.
2.20
Module Recovery
The module recovery is required if the bootloader on the device is no longer capable of booting
the module. In the normal software update process, this feature is not required. You will find
additional information about the module recovery at our Developer Center
In order to enter recovery mode, the dedicated recovery pin (CTRL_RECOVERY_MICO#, SODIMM
pin 246) needs to be pulled down with ≤1k
Ω
during the initial power on (cold boot) of the module.
In recovery mode, the software could be downloaded to the module via the USB_1 interface.
It is highly recommended to add at least a test point on the carrier board to the
CTRL_RECOVERY_MICO# pin and having the USB_1 interface accessible.
2.20.1
Recovery Signals
Verdin
Pin
Verdin
Signal Name
I/O
Type
Power
Rail
Description
246
CTRL_RECOVERY_MICO#
I
OD
1.8V
Recovery mode strapping input. Pull-up resistor on
module, additional pull-up on carrier board not allowed.
165
USB_1_D_P
I/O
USB
USB interface used for recovery mode
163
USB_1_D_N
I/O
USB
161
USB_1_ID
I
CMOS
1.8V
If only recovery is used (only client mode), this pin can
be permanently pulled up to 1.8V
159
USB_1_VBUS
I
CMOS
5V
tolerant
Bus voltage detection in client mode
Table 35: Recovery Signals
2.20.2
Reference Schematics
Figure 46: Recovery Reference Schematic
GND
1nF
2KV
C25
GND_CHASSIS
USB_1_VBUS
USB_1_D_N
USB_1_D_P
USB_1_D_CON_N
USB_1_D_CON_P
+V1.8_SW +V1.8_SW
GND
GND
R22
100K
R24
100K
R26
100K
1M
R27
12R@100MHz
1
2
3
4
L2
ESD9101P2T5G
D3
GND
ESD9101P2T5G
D4
GND
ESD9101P2T5G
D5
GND
USB_1_EN
155
USB_1_OC#
157
USB_1_VBUS
159
USB_1_D_N
163
USB_1_D_P
165
USB_1_ID
161
USB_2_SSTX_N
169
USB_2_SSTX_P
171
USB_2_SSRX_N
175
USB_2_SSRX_P
177
USB_2_D_N
181
USB_2_D_P
183
USB_2_EN
185
USB_2_OC#
187
X1H
2309409-2
629105150521
VCC
1
D-
2
D+
3
ID
4
GND
5
S1
S3
S2
S4
X2
CTRL_RECOVERY_MICO#
246
CTRL_PWR_BTN_MICO#
248
CTRL_FORCE_OFF_MOCI#
250
CTRL_WAKE1_MICO#
252
CTRL_PWR_EN_MOCI
254
CTRL_SLEEP_MOCI#
256
CTRL_RESET_MOCI#
258
CTRL_RESET_MICO#
260
X1W
2309409-2
RECOVERY BUTTON
1
2
3
4
SW1
TD-03XB
GND