Miscellaneous Control RegistersBCM5718 Programmer’s Guide
Broadcom®
January 29, 2016 • 5718-PG108-R Page 485
TX Time Watchdog MSB[1] Reg (offset: 0x6924)
EAV Ref Corrector Reg [Offset 0x6928)
EAV Ref Count Snapshot LSB[1] Reg (Offset 0x6930)
This LSB & MSB pair captures the EAV Reference Count when externally triggered by the desired TimeSync/
APE_GPIO pin; a toggle serves a trigger. The only legal sequence of accessing this pair is Read-LSB followed
by Read-MSB.
Name Bits Access
Default
Value
Description
Enable Lock Timer 31 RW 0 Write a 1 to enable Time Watchdog[0].
Watchdog MSB Value 30:0 RW 0x00 This, concatenated with the Watchdog[0] LSB
value, constitutes a 63-bit value. Precision of the
value is 1ns, which equates to the precision of the
EAV Reference Count.
If bit[31] ==1, the required Timesync/APE GPIO
toggles as soon as EAV Reference Count[62:0]
increments to match this 63-bit value.
Note: Setting this time value back in time produces
no toggle.
Name Bits Access
Default
Value
Description
Correction Enable 31 RW 0 Write a 1 to Enable the Correction feature.
Correction Sense 30 RW 0 If 0, the correction is an addition.
If 1, the correction is a subtraction.
Reserved 29:24 RO 0x00 Reserved
Correction Value 23:0 RW 0x000001 This value is accumulated in an accumulator every
EAV REF CLK tick until it overflows–upon which
the EAV REF COUNT is corrected by a 8ns unit &
the acc is reloaded.
A 0x0 value is not permissible.
Name Bits Access
Default
Value
Description
EAV Reference Count
Snap-shot
[lower half]
31:0 RO U LSB of the EAV Reference Count as snapshot by
TimeSync/APE_GPIO.
[2:0] shall always be 000
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