NEC UPD98413 User Manual page 75

(h) Packet Extracting from SONET payload on HALT mode
The µ PD98413 supports the HALT mode, which enables to receive the fragmentary packet.
In default, this mode is disabled. It can be enable by the HALTM bit of the MOPOSR register. The data "7Dh-xxh"
is terminal flag for the partial packet. If this flag is asserted, the packet extract is paused. Then if expect data
except "7E", that data is recognized as the next partial packet.
Flag sequence
7Eh Address
Flag sequence
Address
Name
Flag sequence
Terminal of Partial paket
CHAPTER 3 FUNCTIONAL OUTLINE
Figure 3-26. Packet Extracting on HALT mode
Terminal of Partial paket
Control Partial packet
7Eh Partial packet 7Dh-xxh
Terminal of Partial paket
Extructing Packet
Control Partial packet
Value
7Eh
7Dh-xxh
(xx is the value, which set by the STPN[7:0] bits of the HPTNR register.)
PRELIMINARY
Flag sequence
7Dh-xxh 7Eh
7Eh partial packet
Flag sequence
Partial packet Partial packet
FCS 7Eh
Flag sequence
FCS
NEC confidential and Proprietary
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