PM5364 pmc-sierra, PM5364 Datasheet - Page 223

• Manufacturer Part Number: PM5364
• Description: Tupp 2488 Assp Telecom Standard
• Manufacturer: pmc-sierra

13.11.2
13.11.3
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
Figure 56 Transmitter Interface Configurations
The receiver termination can be configured to be either floating or to be connected to the 1.2V
supply. This can be controlled by the RX_TERM register bit as shown in Figure 57.
Figure 57 Receiver Termination Modes
When using transmit pre-emphasis, the first bit that follows a transition from 1 to 0 or from 0 to
1 has a greater amplitude than bits that do not follow transitions. This is illustrated in Figure 58.
Receiver Termination
Pre-emphasis
(TXCML)
(TXCML)
VDDI
(DC coupled, no CM current)
0V
R
R
TERM
TERM
Floating Termination
a) 50Ω to 1.2V
RX_TERM = 0
/ 2
/ 2
(RX)
1.2V
69pF
(TXCML)
(TXCML)
VDDI
0V
b) 100Ω floating
(for AC coupling or CML drivers,
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
R
R
TERM
TERM
Termination to 1.2V
allows CM current)
RX_TERM = 1
/ 2
/ 2
V
tt
VDDI
69pF
(TXCML)
(TXCML)
R
VDDI
0V
SERIES
c) 100Ω AC coupled
Released
V
TERM
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