| Field Name | 
Length (bits) | 
Bit | 
Contents | 
Description | 
| Item | 
Total | 
Algn | 
Off | 
| executeFep | 
96 + 32*n | 
16 | 
0 | 
command Packet | 
Call a subroutine on one FEP (see table 55, swreq Rev. I) | 
  header | 
48 | 48 | 
16 | 
0 | 
command Header | 
Command Packet Header | 
    commandLength | 
16 | 16 | 
16 | 
0 | 
uint16 = 6+2*n | 
Number of 16-bit words in the command packet | 
    commandIdentifier | 
16 | 16 | 
16 | 
16 | 
uint16 | 
Used by ground to identify the command | 
    commandOpcode | 
16 | 16 | 
16 | 
32 | 
uint16 = 6 | 
Command Operation code which determines format and action of the command [see enum CmdOpcode]: CMDOP_EXEC_FEP | 
  fepId | 
3 | 3 | 
1 | 
48 | 
uint3 | 
Id of Front End Processor containing function to call [see enum FepId] | 
  functionAddress | 
32 | 32 | 
32 | 
64 | 
uint32 | 
Front End Processor address of function to call | 
  functionArguments[pl/2-3] | 
32 | 32*n | 
32 | 
96 | 
uint32 | 
Arguments to pass to the function |