DS3170 Maxim Integrated Products, DS3170 Datasheet - Page 59

• Manufacturer Part Number: DS3170
• Description: Network Controller & Processor ICs DS3-E3 Single-Chip T ransceiver T3-E3 Fra
• Manufacturer: Maxim Integrated Products

Table 10-4. Source Selection of TCLKO (Internal Tx Clock)
Figure 10-3
Figure 10-3. Internal Rx Clock
Table 10-5
Table 10-5. Source Selection of RCLKO Clock Signal (Internal Rx Clock)
10.2.3 Line IO Pin Timing Source Selection
The line IO pins can use any input clock pin (RLCLK or TCLKI) or output clock pin (TLCLK, RCLKO, or TCLKO) for
its clock pin and meet the AC timing specifications as long as the clock signal is valid for the mode the part is in.
The clock select bit for the transmit line IO signal group PORT.CR3.TLTS selects the correct input or output clock
timing.
SIGNAL
SIGNAL
RCLKO
TCLKO
Rx LIU CLOCK
identifies the source of the output signal RCLKO based on certain variables and register bits.
shows the source of the RCLKO signals.
PORT.CR3
PORT.CR3
RLCLK
LOOPT
LOOPT
1
1
0
0
0
0
1
1
0
0
0
0
0
TCLKO
PLB disabled
PLB disabled
(PORT.CR4)
DLB (1XX) or ALB (001)
PLB (011)
PLB (011)
LBM[2:0]
DLB disabled & ALB
LIUEN
XXX
XXX
0
1
DLB disabled
(PORT.CR4)
DLB (1XX)
DLB (1XX)
LBM[2:0]
disabled
XXX
XXX
DIAGNOSTIC
LOOPBACK
LIUEN
0
1
X
X
1
0
1
0
59 of 230
(PORT.CR3)
LIUEN
CLADC
X
1
0
1
0
0
1
X
X
X
X
0
1
RCLKO
(PORT.CR3)
CLADC
DS3170 DS3/E3 Single-Chip Transceiver
X
X
X
X
0
1
1
SOURCE
RLCLK
RLCLK
Rx LIU
Rx LIU
TCLKI
CLAD
SOURCE
RLCLK
RLCLK
Rx LIU
Rx LIU
TCLKI
TCLKI
CLAD