39.17.4 Host Frame Number

Name: FNUM
Offset: 0x10
Reset: 0x0000
Property: PAC Write-Protection

Bit 15141312111098 
   FNUM[10:5] 
Access R/WR/WR/WR/WR/WR/W 
Reset 000000 
Bit 76543210 
 FNUM[4:0]    
Access R/WR/WR/WR/WR/W 
Reset 00000 

Bits 13:3 – FNUM[10:0] Frame Number

These bits contains the current SOF number.

These bits can be written by software to initialize a new frame number value. In this case, at the next SOF, the FNUM field takes its new value.

As the FNUM register lies across two consecutive byte addresses, writing byte-wise (8-bits) to the FNUM register may produce incorrect frame number generation. It is recommended to write FNUM register word-wise (32-bits) or half-word-wise (16-bits).