![](http://datasheet.mmic.net.cn/380000/-PD98405_datasheet_16745025/-PD98405_133.png)
CHAPTER 5 SAR FUNCTION
133
If the pattern (100 or 101) for the OAM F5 cell is set:
The
μ
PD98405 unconditionally transmits that packet as an OAM cell. The transmission of an
OAM cell differs from that of an AAL-5 or raw cell (including the RM cell). See
Section 5.4.6
.
If the pattern of an OAM F5 cell is set, clear the AAL bit to "0" to select raw cells.
When using packet descriptors for OAM F5 cell transmission, use a single packet descriptor for
each OAM F5 cell. The buffers indicated by a packet descriptor for OAM F5 cell transmission
must be used in single-buffer mode, not multi-buffer mode.
If a pattern other than that for the OAM F5 cell is set:
Whether the packet is processed as the transmit packet of AAL-5, or as a raw cell, is determined
by the setting of the AAL bit.
If AAL-5 type is set (AAL bit = 1):
The
μ
PD98405 inserts the code set in this field as is for cells other than the last cell. The
μ
PD98405 transmits the last cell of a packet after changing the least significant bit to "1."
AAL type other than AAL-5 (AAL bit = 0):
The
μ
PD98405 inserts the contents set in this field into all the headers of the transmit packet
prior to transmission. The
μ
PD98405 transmits the last cell without changing the least
significant bit of the PTI field to "1."
<4>
GFC
This field contains the GFC patterns of all the cells of this transmit packet. The
μ
PD98405 inserts the
contents arbitrarily set by the user into all the GFC fields prior to transmission.
<5>
IM
This bit specifies whether the
μ
PD98405 informs the host of the completion of packet transmission.
1
The
μ
PD98405 does not inform the host of the completion of packet
transmission.
IM
0
The
μ
PD98405 informs the host of the completion of packet transmission
by means of an interrupt, and stores an indication into the mailbox.
If this bit is set to "1," the
μ
PD98405 does not issue a packet transmission completion interrupt to the
host or store an indication into the mailbox. The following example shows how a packet for which the
transmission completion interrupt is masked is handled.