ACS8509 Semtech Corporation, ACS8509 Datasheet - Page 34

• Manufacturer Part Number: ACS8509
• Description: Synchronous Equipment Timing Source for Sonet or SDH Network Elements
• Manufacturer: Semtech Corporation

Table 14 Register Description (cont...)
Revision 2.00/January 2006 © Semtech Corp.
ADVANCED COMMUNICATIONS
46
47
48
50
51
52
Addr.
(Hex)
cnfg_freq_divn
cnfg_monitors
cnfg_activ_upper_
threshold0
cnfg_activ_lower_
threshold0
cnfg_bucket_size0
Register Name
This 14-bit integer is used as the divisor for any input applied to SEC1 to SEC4 to get
the phase locking frequency desired. Only active for inputs with the DivN bit set to
“1”. This will cause the input frequency to be divided by (N+1) prior to phase
comparison, e.g. program N to:
The reference_source_frequency bits should be set to reflect the closest spot
frequency to the input frequency, but must be lower than the input frequency.
Bits (7:0) cnfg_freq_divn bits (7:0).
Bits (7:6) Unused.
Bits (5:0) cnfg_freq_divn bits (13:8).
This 7-bit register allows global configuration of monitors and control of phase build-
out.
Bit 7 Unused.
Bit 6
=1 Enables value of the main_ref_failed interrupt to be driven out of pin TDO,
=0 Disables value of the main_ref_failed interrupt from being driven out of pin TDO
(default).
Bit 5
=1 Enables ultra fast switching: Allows the DPLL to raise an inactivity alarm on the
currently selected source after missing only a few cycles. See “Ultra Fast Switching”
on page 37,
=0 Normal operation (default).
Bit 4
Bit 3
=1 Will freeze the output phase relationship with the current input to output phase
offset,
=0 Allows changes in input to output phase offset (Normal phase buildout mode)
(default).
Bit 2
=1 Enables phase build out (default),
=0 DPLL will always lock to 0°.
Bits (1:0) are for configuring frequency monitors- 00 = off, 01 = 15 ppm (default),
others are reserved for future use.
Bits (7:0) set the value in the leaky bucket that causes the activity alarm to be raised.
Bits (7:0) set the value in the leaky bucket that causes the activity alarm to be
cleared.
Bits (7:0) set the maximum value that the leaky bucket can reach given an inactive
input.
Unused.
((input freq)/ 8 kHz) -1
FINAL
Page 34
Description
ACS8509 SETS
Default Value (Bin)
DATASHEET
www.semtech.com
00000000
00000110
00000100
00001000
XX000000
X0000101