Freescale Semiconductor MPC850 User Manual page 941

0
CT_Offset + 20 — —
CT_Offset + 22
CT_Offset + 24
CT_Offset + 28
CT_Offset + 2C
CT_Offset + 2E
CT_Offset + 30
CT_Offset + 32
CT_Offset + 34
CT_Offset + 38
CT_Offset + 3A
CT_Offset + 3C OUT
CT_Offset + 3E
Table 37-4 describes the TCT fields.
CT Offset Bits Name
0x20 0–7 —
8 PC
9–10 —
11 INF
12 CR10
13 CDIS
14–15 AAL
Receive and Transmit Connection Tables (RCTs and TCTs)
1 2 3 4 5
— — — —
Figure 37-9. Transmit Connection Table (TCT)
Table 37-4. TCT Field Descriptions
Reserved
Padded cell. Indicates that the transmitter must add an additional padded cell to the
end of an AAL5 frame. The user must clear this bit during initialization.
Reserved
In frame status. The transmitter sets TCT[INF] when a new frame starts and clears it
when the frame ends. This bit is used internally.
0 Idle state. No buffer is open for this channel.
1 Sending. The transmitter is in the middle of a frame; a transmit buffer is open.
Perform CRC10 (AAL0 only). This bit enables CRC10 calculation on the transmit
cell payload for OAM support according to the ITU specification I.610.
0 Do not perform CRC10.
1 Perform CRC10 and insert the result into the CRC field (the last 10 bits of the
OAM cell payload).
Channel disable status. Set by the
RESTART TRANSMIT
0 Transmission is enabled.
1 Transmission is disabled.
Note that the user should not modify this bit directly; that is, the
RESTART TRANSMIT
CDIS should be cleared during initialization.
AAL type. Selects the ATM adaptation layer support for transmit cells.
00 AAL0 (raw-cell channel). The transmitter sends cells using the AAL0 buffer
format.
01 AAL5. The transmitter performs AAL5 cell segmentation and sends the 48 bytes
of payload from the transmit buffer. The AAL5 frame trailer is generated when
the last cell of the PDU is sent.
1x Reserved
Chapter 37. Buffer Descriptors and Connection Tables
6 7 8 9 10
— — PC — —
TBALEN
TCRC
TB_PTR
TTMLEN
TBD_PTR
TBASE
—
CHEAD
APCL
APCPR
APCP
APCPF
Description
STOP TRANSMIT
command.
commands should be used to control the CDIS bit. However,
11 12 13 14
INF CR10 CDIS AAL
(abort) command; cleared by the
STOP TRANSMIT
15
and