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ACS8515REV2.1T View Datasheet(PDF) - Semtech Corporation

Part Name
Description
MFG CO.
'ACS8515REV2.1T' PDF : 50 Pages View PDF
ACS8515 Rev2.1 LC/P
ADVANCED COMMUNICATIONS
Table 11. Register Map Description (continued).
FINAL
Addr. Parameter Name
(Hex)
cnfg_monitors
Description
This register allows global configuration of monitors and control of phase build out.
Default
Value (bin)
Bit 7 Unused
Bit 6 Unused
Bit 5
=1 Enables ultra fast switching: Allows the DPLL to raise an activity alarm on the currently
selected source after missing only a few cycles. See section on Ultra Fast Switching.
=0 Normal operation (default)
Bit 4
X0000101
48
=1 Forces locking to SEC1 (pin 29) if pin SRCSW high, or SEC2 (pin 30) if pin SRCSW low
=0 Pin SRCSW ignored, and automatic control enabled
(SRCSW low)
X0010101
(SRCSW high)
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 to take place (Normal phase build out mode)
(default)
Bit 2
=1 Enables phase builtd out (default)
=0 DPLL will allows lock to 0°
Bits (1:0) are for configuring frequency monitors- 00 = off, 01 = 15ppm, others are reserved for
future use.
50 cnfg_activ_upper_threshold 0 Bits (7:0) set the value in the leaky bucket that causes the activity alarm to be raised.
51 cnfg_activ_lower_threshold 0 Bits (7:0) set the value in the leaky bucket that causes the activity alarm to be cleared.
52 cnfg_bucket_size 0
Bits (7:0) set the maximum value that the leaky bucket can reach given an inactive input.
cnfg_decay_rate 0
Bits (7:2) Unused
00000110
00000100
00001000
Bits (1:0) control the leak rate of the leaky bucket. The fill-rate of the bucket is +1 for every
128 ms interval that has experienced some level of inactivity. The decay rate is programmable
53
in ratios of the fill rate. The ratio can be set to 1:1, 2:1, 4:1, 8:1 by using values of 00, 01, 10,
11 respectively. However, these buckets are not ‘true’ leaky buckets in nature. The bucket
stops ‘leaking’ when it is being filled. This means that the fill and decay rates can be the same
(00 = 1:1) with the net effect that an active input can be recognised at the same rate as an
inactive one.
54 cnfg_activ_upper_threshold 1 As for register 50 but for bucket 1.
55 cnfg_activ_lower_threshold 1 As for register 51 but for bucket 1.
56 cnfg_bucket_size 1
As for register 52 but for bucket 1.
57 cnfg_decay_rate 1
As for register 53 but for bucket 1.
58 cnfg_activ_upper_threshold 2 As for register 50 but for bucket 2.
59 cnfg_activ_lower_threshold 2 As for register 51 but for bucket 2.
5A cnfg_bucket_size 2
As for register 52 but for bucket 2.
5B cnfg_decay_rate 2
As for register 53 but for bucket 2.
5C cnfg_activ_upper_threshold 3 As for register 50 but for bucket 3.
5D cnfg_activ_lower_threshold 3 As for register 51 but for bucket 3.
5E cnfg_bucket_size 3
As for register 52 but for bucket 3.
5F cnfg_decay_rate 3
As for register 53 but for bucket 3.
XXXXXX01
00000110
00000100
00001000
XXXXXX01
00000110
00000100
00001000
XXXXXX01
00000110
00000100
00001000
XXXXXX01
Revision 2.01/December 2005 Semtech Corp.
28
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