4 detailed description of smc command codes, 1 set/clear watchdog-timer – ADLINK CoreExpress-ECO2 User Manual
Page 12
4 DETAILED DESCRIPTION OF SMC COMMAND CODES
4.1 Set/Clear Watchdog-timer
After Start-Up the Watchdog is disabled or loaded with a startup value (Type II Watchdog) from the
Flash memory. This command must be used to (re-)load or to clear the Timeout of the Watchdog-
timer. The timeout value is given in seconds and has a 16-bit (two byte wide) size. So the Timeout
of the Watchdog can be set to 1-65535 seconds. 0 disables the Watchdog.
START SMC_addr ACK command ACK length ACK MSB_byte ACK LSB_byte ACK STOP
Table 4.1.1 SMC receiver format of the Watchdog-timer Command Code
ITEM
DESCRIPTION
START
SM-bus start condition
SMC_addr
0x50 (8-bit)
ACK
SM-bus acknowledge condition generated by receiver
command
0x20 = “Set/Clear Watchdog-timer” Command code
length
0x02 = 2 Bytes data length
MSB_byte
High-byte of Timeout-value in seconds
LSB_byte
Low-byte of Timeout-value in seconds
STOP
SM-bus stop condition
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