ACS8509 Semtech Corporation, ACS8509 Datasheet - Page 35

• 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
53
54
55
56
57
58
59
5A
5B
5C
5D
5E
5F
7F
Addr.
(Hex)
cnfg_decay_rate0
cnfg_activ_upper_
threshold1
cnfg_activ_lower_
threshold1
cnfg_bucket_size1
cnfg_decay_rate1
cnfg_activ_upper_
threshold2
cnfg_activ_lower_
threshold2
cnfg_bucket_size2
cnfg_decay_rate2
cnfg_activ_upper_
threshold3
cnfg_activ_lower_
threshold3
cnfg_bucket_size3
cnfg_decay_rate3
cnfg_uPsel
Register Name
Bits (7:2)Unused
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 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 recognized at the same rate as an inactive one.
As for Reg. 50 but for bucket 1
As for Reg. 51 but for bucket 1
As for Reg. 52 but for bucket 1
As for Reg. 53 but for bucket 1
As for Reg. 50 but for bucket 2
As for Reg. 51 but for bucket 2
As for Reg. 52 but for bucket 2
As for Reg. 53 but for bucket 2
As for Reg. 50 but for bucket 3
As for Reg. 51 but for bucket 3
As for Reg. 52 but for bucket 3
As for Reg. 53 but for bucket 3
Bits (7:3) Unused.
Bits (2:0) can be used to change the mode of the microprocessor interface. The
interface will initially be set as the pins UPSEL (pins 58 - 60) - the pin set up can be
read via register 37 (cnfg_uPsel_pins). At power up or reset the device will default to
this setting.
This register can be used to change the microprocessor mode after start up,
supporting booting from EPROM and subsequently communicating via another mode.
At start up the EPROM will down load the pre-programmed settings for all the
registers, and as the last operation, action the change of interface with this last
register. It is recommended that this function is only used for EPROM start up
applications, as subsequent versions of this device may only allow operation in this
way. The bits are defined in Table 11 or as given in Reg. 37 of the register map
description.
FINAL
Page 35
Description
ACS8509 SETS
Default Value (Bin)
DATASHEET
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Pin dependent
00000110
00000100
00001000
00000110
00000100
00001000
00000110
00000100
00001000
XXXXXX01
XXXXXX01
XXXXXX01
XXXXXX01
Bits(7:3)=
Bits(2:0)=
XXXXX