ACS406CS Semtech Corporation, ACS406CS Datasheet - Page 8

• Manufacturer Part Number: ACS406CS
• Description: Two-chip Fiber Optic Modem Ics / ACS4060 100-pin Tqfp, ACS9010 44-pin TQFP
• Manufacturer: Semtech Corporation

In order to select one T2 channel then set DR5 =
DR4 = DR3 = DR2 = 1; DR1 = 0, together with a
crystal of 31.560MHz as shown in the Table 8.
In order to select two independent E1 channels in
TX2 mode then set DR5 = DR4 = DR3 = DR1 = 1;
DR2 = 0, together with a crystal of 32.768MHz as
shown in the Table 9.
In order to select two independent E1 channels in TX2
mode then set DR5 = DR4 = DR3 = 1; DR1 = DR2 =
0, together with a crystal of 30.88MHz as shown in the
Table 10.
In order to select one E1 channel operating in High
Tolerance (HT) mode then set DR5 = DR4 = DR2 =
DR1 = 1; DR3 = 0,
32.768MHz as shown in the Table 11.
T2 Selection
2 * E1 Channel Selection
2 * T1 Channel Selection
1 * E1 Channel Selection HT mode
DR5
DR5
DR5
DR5
1
1
1
1
crystal = 33.792 MHz
crystal = 31.560 MHz
crystal = 32.768 MHz
crystal = 30.88 MHz
DR4
DR4
DR4
DR4
1
1
1
1
DR3
DR3
DR3
DR3
1
1
1
1
DR2
DR2
DR2
DR2
1
1
0
0
together with a crystal of
DR1
DR1
DR1
DR1
1
0
1
0
XTAL
Divide
XTAL
Divide
XTAL
Divide
XTAL
Divide
4
5
16
20
Table 7
Table 8
Table 9
Table 10
TCLK
(MHz)
TCLK
(MHz)
TCLK
(MHz)
TCLK
(MHz)
8.448
6.312
2.048
1.544
8
In order to double the available transmission distance
from 25km to 50km, the value of the crystal must be
reduced by half. For a single E1 channel set DR5 =
DR4 = DR3 = DR2 = 0; DR1 = 1, together with a
crystal of 16.384MHz as shown in Table 12.
In order to set the device for one T1 channels
operating in High Tolerance Mode (HT) then DR5 =
DR4 = DR2 = 1; DR3 = DR = 0, together with a
crystal of 30.88MHz as shown in the Table 13.
In order to double the available transmission distance
from 25km to 50km, the value of the crystal must be
reduced by half. For a single T1 channel then set
DR5 = 1; DR4 = DR3 = DR2 = DR1 = 0, together
with a crystal of 15.44MHz as shown in Table 14.
1 * E1 Channel Selection at 50km
1 * T1 Channel Selection in HT mode
1 * T1 Channel Selection at 50km
DR5
DR5
DR5
DR5
1
1
1
1
crystal = 32.768 MHz
crystal = 16.384 MHz
crystal = 30.88 MHz
crystal = 15.44 MHz
DR4
DR4
DR4
DR4
1
0
1
0
DR3
DR3
DR3
DR3
0
0
0
0
DR2
DR2
DR2
DR2
1
0
1
0
DR1
DR1
DR1
DR1
1
1
0
0
ACS406CS Issue 1.6 January 1999.
XTAL
Divide
XTAL
Divide
XTAL
Divide
XTAL
Divide
16
20
20
8
Table 11
Table 12
Table 13
Table 14
TCLK
(MHz)
TCLK
(MHz)
TCLK
(MHz)
TCLK
(MHz)
2.048
2.048
1.544
1.544