CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
139
4.4 Overhead Insert/Extract Interfaces and Section/Line DCC Insert/Extract Interface
The
µ
PD98413 has insert interfaces that input TOH and POH to be transmitted from external peripheral devices,
and extract interfaces that output the contents of received TOH and POH.
And the
µ
PD98413 provides access to both Section and Line Data Communication Channels (DCC). Both
channels are accessed using the serial interface pins TSD, TLD, RSD and RLD, and their associated clocks
TSDCLK, TLDCLK, RSDCLK and RLDCLK respectively.
Both Overhead interface and DCC interface is multiplexed. Which interface to use is selected by the MDPT
register. If both interfaces are enabled, the overhead interface is take precedence.
Table 4-1 Correspondence table of multiplexed OH interface and DCC interface
Pin Name
OH Interface
DCC
Interface
Pin Name
OH Interface
DCC
Interface
TOHCLK
TOHCLK Not
Use
ROHCLK ROHCLK Not
Use
TTOHFP
TTOHFP TSDCLK
RTOHFP RTOHFP RSDCLK
TPOHFP
TPOHFP TLDCLK
RPOHFP RPOHFP RLDCLK
TOHAV
TOHAV Not
Use
ROHAV ROHAV Not
Use
TOHD [0]
TOHD [0]
TSD
ROHD [0]
ROHD [0]
RSD
TOHD [1]
TOHD [1]
TLD
ROHD [1]
ROHD [1]
RLD
Figure 4-20. OH Insert / Extract Interfaces and Section / Line DCC Interfaces
TOHCK
TTOHFP / TSDCLK
TPOHFP / TLDCLK
TOHD[0] / RSD
TOHD[1] / RLD
TOHAV
ROHCK
RSDCLK / RTOHFP
RLDCLK / RPOHFP
RSD / ROHD[0]
RLD / ROHD[1]
ROHAV
TOH / POH
extract
Interface
and
Section /
Line DCC
extract
Interface
TOH /POH
insert
Interface
and
Section /
Line DCC
insert
Interface
µµµµ
PD98413
Содержание UPD98413
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