ACS8525T Semtech, ACS8525T Datasheet - Page 29

• Manufacturer Part Number: ACS8525T
• Description: Line Card Protection Switch for SONET/SDH Systems
• Manufacturer: Semtech

“Digital” Frequencies
Table 11, “O1 and O2 Output Frequency Selection,” lists
Digital1 and Digital2 as available for selection. Digital1 is
a single frequency selected from the range shown in
Table 12. Digital2 is another single frequency selected
from the same range.
Using Output O2 to Control Pulse Width of 2/8 kHz on FrSync,
MFrSync and 01 Outputs
It can be seen from Table 11 (01 and 02 Output
Frequency Selection) that frequencies listed as 2 kHz and
8 kHz can be selected. Whilst the FrSync and MFrSync
outputs are always supplied from DPLL1, the 2 kHz and
Table 12 Digital Frequency Selections
Figure 7 Control of 8k Options.
Revision 3.01/August 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
Reg.39 Bits [5:4]
Digital1 Control
02 Output
FrSync at 8 kHz, or
Output 01 at 8kHz
02 Output
FrSync at 8 kHz, or
Output 01 at 8kHz
00
01
10
11
00
01
10
11
a) Clock non-inverted, Reg.7A[3:2] = 00
b) Pulse non-inverted, Reg.7A[3:2] = 01
SDH Reg. 38 Bit5
Digital1 SONET/
0
0
0
0
1
1
1
1
Digital1 Freq. (MHz)
16.384
12.352
2.048
4.096
8.192
1.544
3.088
6.176
FINAL
Page 29
02 Output
FrSync at 8 kHz, or
Output 01 at 8kHz
02 Output
FrSync at 8 kHz, or
Output 01 at 8kHz
8 kHz options available from the O1 and O2 outputs are
all supplied via DPLL1 or DPLL2 (Reg. 7A Bit 7).
The outputs can be either clocks (50:50 mark-space) or
pulses, and can be inverted. When pulse configuration is
used, the pulse width will be one cycle of the rate selected
on Output O2 (Output O2 must be configured to generate
at least 1,544 kHz to ensure that pulses are generated
correctly). Figure 7 shows the various options with the
8 kHz controls in Reg. 7A. There is an identical
arrangement with Reg. 7A Bits [1:0] for the 2 kHz 01 and
MFrSync outputs. Outputs FrSync and MFrSync can be
disabled via Reg. 63 Bits [7:6].
Reg. 39 Bits[7:6]
Digital2 Control
00
01
10
11
00
01
10
11
c) Clock inverted, Reg.7A[3:2] = 10
d) Pulse inverted, Reg.7A[3:2] = 11
Digital2 SONET/SDH
Reg.38 Bit6
0
0
0
0
1
1
1
1
ACS8525 LC/P
F8525_016outputoptions8k_01
Digital2 Freq. (MHz)
DATASHEET
www.semtech.com
16.384
12.352
2.048
4.096
8.192
1.544
3.088
6.176