Motorola PowerQUICC II MPC8280 Series Reference Manual page 1178

AAL2 Transmitter
33.3.5 AAL2 Tx Data Structures
The following sections describe the transmit connection tables (TCT) and the structures in
which CPS packets and SSSAR SDUs are stored in memory.
33.3.5.1 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 33-6 shows the
AAL2-specific TCT.
0 1
Offset + 0x00 — GBL
Offset + 0x02
Offset + 0x04
Offset + 0x06
Offset + 0x08
Offset + 0x0A
Offset + 0x0C
Offset + 0x0E
Offset + 0x10
Offset + 0x12
Offset + 0x14
Offset + 0x16
Offset + 0x18
Offset + 0x1a
Offset + 0x1C —
Offset + 0x1E —
Figure 33-6. AAL2 Protocol-Specific Transmit Connection Table (TCT)
When the channel is active, the CP fetches the TCT (32 bytes)
using burst cycle and writes back only the first (24 bytes).
33-10
Freescale Semiconductor, Inc.
2 3 4 5 6
BO — DTB BIB AVCF PFM
—
Rate Remainder
Timer_Period_Shadow
APC Linked Channel
ATM Cell Header (VPI,VCI,PTI,CLP)
PMT
PFT
NOTE
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7 8 9 10
ATT
—
—
FirstQueue
PCR Fraction
PCR
Timer_CU_period
—
—
11 12 13 14
ET VCON INTQ
NoSTF AAL
MaxStep
OneP STPT Fix
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15
PM