Board features, 1 block diagram, 2 redundant mmc flash & fwum – Kontron AM4520 Manual Mid-Size User Manual
Page 16: 1 block diagram 2.2 redundant mmc flash & fwum, Figure 2-1: block diagram, Am4520
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2. Board Features
2.1
Block Diagram
Figure 2-1: Block Diagram
2.2
Redundant MMC Flash & FWUM
The MMC microcontroller runs a firmware from its internal 256KB flash. It is programmed by an other
microcontroller named FWUM (FirmWare Update Manager). The FWUM keeps the last two copies of the MMC
firmware in dedicated flash memories. The FWUM act as a watchdog to the MMC and can rollback a firmware
update in the MMC in case of problems.
The FWUM itself is a microcontroller with internal flash to store MMC firmware image. This microcontroller is
also an external watchdog for the MMC. Functions of this microntroller is kept to a minimum. The FWUM
firmware is field updatable.
Note:
The MMC and the FWUM have an internal hardware watchdog.
AM4520
PSU
12V => 5V
12V => 3.3V
12V => 12V
MMC
H8S/2168
256KB FLASH
256KB FLASH
FWUM
R5F21134
Powered by 3.3V Management (100mA Max)
FW
UPGRADE
AMC EDGE CONNECTOR
2.5" SAS HARD DISK
5V 3.3V 12V
AMC POR
T2
AMC POR
T3
IPMI