1. PCI/PCIe TFP Hardware
Command 0x27: Synchronize RTC to External Time Data
This command forces the TFP to synchronize the RTC time to the current time. Note that when the
TFP is locked to a timing reference, the RTC is adjusted automatically.
Command 0x28: RTC Battery Connection Control
This command controls the connection/disconnection of the RTC battery. The disconnect control
may be used to keep the battery from being discharged while in storage. The next time the board is
powered up, the battery is automatically reconnected to resume RTC battery backup power when the
board power is removed. Connect=0x1, Disconnect=0x0.
Byte
Type
Item
Value or Range
0
UINT8
ID
0x26
1-2
INT16
battcon
0x0, 0x1
Command 0x30: Send Packet to GPS Receiver (bc637 only)
This command allows the user to send a GPS packet to the GPS receiver. The format and use of this
command is described in GPS Receiver Interface.
Command 0x31: Request Packet from GPS Receiver (bc637 only)
This command allows the user to request a GPS packet (i.e., position, velocity, status, etc.) from the
GPS receiver. The format and use of this command is described in GPS Receiver Interface.
Command 0x32: Manually Request Packet from GPS Receiver (bc637 only)
This command is similar in function to Command 0x31. Refer to GPS Receiver Interface.
Command 0x33: Set GPS Time Format (bc637 only)
This command allows the user to select between GPS time and UTC when using Timing Mode 6
(GPS). The relationship between UTC and GPS time is shown below. The default setting is UTC
(UTC = GPS Time + Leap Seconds).
Byte
Type
Item
Value or Range
1
UINT8
ID
0x33
2-5
UINT8
GPS time format
flag
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