Freescale Semiconductor MPC8260 - Manual (Page 1071)

ATM AAL2
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 32-9
32.3.5.1 AAL2 Protocol-Specific TCT
The transmit connection table (TCT) is a VC-level table and is where the AAL type for the ATM channel
number is selected. The parameters related to the ATM channel number or to all the TX Queues of the
ATM channel are maintained here.
Figure 32-6 shows the AAL2-specific TCT.
NOTE
When the channel is active, the CP fetches the TCT (32 bytes) using burst
cycle and writes back only the first (24 bytes).
Table 32-1 describes the AAL2 TCT fields.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Offset + 0x00 — GBL BO — DTB BIB AVCF PFM ATT ET VCON INTQ
Offset + 0x02 — NoSTF AAL
Offset + 0x04 —
Offset + 0x06
Offset + 0x08 —
Offset + 0x0A FirstQueue
Offset + 0x0C Rate Remainder PCR Fraction
Offset + 0x0E PCR
Offset + 0x10 Timer_CU_period
Offset + 0x12 Timer_Period_Shadow
Offset + 0x14 —
Offset + 0x16 APC Linked Channel
Offset + 0x18 ATM Cell Header (VPI,VCI,PTI,CLP)
Offset + 0x1a
Offset + 0x1C — PMT MaxStep
Offset + 0x1E — PFT — OneP STPT Fix PM
Figure 32-6. AAL2 Protocol-Specific Transmit Connection Table (TCT)