Maxim Dallas Semiconductor DS3171, General Description Manual, Page: 58 / 234

DS3171/DS3172/DS3173/DS3174
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Table 10-7. Transmit Framer Pin Signal Timing Source Select
LOOPT
LBM[2:0]
LIUEN C
L
ADC
TFTS
Valid Timing to These Clock Pins
1 XXX X X 0 TCLKOn, TLCLKn, RCLKOn
1 XXX 0 X 1 RLCLKn
1 XXX 1 X 1 No valid timing to any input clock pin
0 PLB (011) or DLB (100) or
ALB(001)
0 X 0 TCLKOn, TLCLKn, RCLKOn
0 PLB (011) or DLB (100) 1 X 0 TCLKOn, TLCLKn, RCLKOn
0 DLB&LLB (110) X X 0 TCLKOn, RCLKOn
0 LLB (010) X X 0 TCLKOn
0 not LLB, DLB or PLB (00X) X X 0 TCLKOn, TLCLKn
0 not PLB (011) X 0 1 No valid timing to any input clock pin
0 not PLB (011) X 1 1 TCLKIn
0 PLB (011) 0 X 1 RLCLKn
0 PLB (011) 1 X 1 No valid timing to any input clock pin
10.2.3.3 Receive Line Interface Pin Timing Source Selection
(RPOSn/RDATn, RNEGn/RLCVn)
The receive line interface signal pin group must clocked in with the RLCLK clock input pin. When the LIU is
enabled, the receive line interface pins are not used so there is no valid clock reference.
Table 10-8. Receive Line Interface Pin Signal Timing Source Select
LOOPT
LBM[2:0]
LIUEN C
L
ADC
Valid Timing to These Clock Pins
X XXX 0 X RLCLKn
X XXX 1 X No valid timing to any clock pin
10.2.3.4 Receiver Framer Pin Timing Source Selection
(RSERn, RSOFOn/RDENn)
The receive framer signal pin group has the same functional timing clock source as the RCLKOn pin described in
Table 10-5 .
Other clock pins can be used for the external timing. The RCLKOn receive clock output pin is always a valid output
clock for external logic to use for these signals when
PORT.CR3 .RFTS=0.
The receive framer timing select bit (RFTS) is used to select input or output clock pin timing. When RFTS=0, output
clock timing is selected. When RFTS=1, input clock timing is selected. If RFTS is set for input clock timing and an
output clock pin is used, or If RFTS is set for output clock timing and an input clock pin is used, then the setup, hold
and delay timings, as specified in Section
18.1 will not be valid. There are some combinations of RFTS=1 and
other modes in which there is no input clock pin available for external timing since the clock source is derived
internally from the RX LIU or the CLAD.