Freescale Semiconductor MPC8260 - Manual (Page 979)

ATM Controller and AAL0, AAL1, and AAL5
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 30-59
Table 30-26 describes UBR+ protocol-specific TCTE fields.
30.10.2.3.8 ABR Protocol-Specific TCTE
Figure 30-36 shows the ABR protocol-specific TCTE.
0 7 8 15
Offset + 0x00 MCR
Offset + 0x02 — MCR Fraction (MCRF)
Offset + 0x04 Maximum Delay Allowed (MDA)
Offset + 0x06–0x1E —
Figure 30-35. UBR+ Protocol-Specific TCTE
Table 30-26. UBR+ Protocol-Specific TCTE Field Descriptions
Offset Bits Name Description
0x00 — MCR Minimum cell rate for this channel. MCR is in units of APC time slots.
0x02 0–7 — Reserved, should be cleared.
8–15 MCRF Minimum cell rate fraction. Holds the minimum cell rate fraction of this channel in units of
1/256 slot.
0x04 — MDA Maximum delay allowed. The maximum time-slot service delay allowed for this priority level
before the APC reduces the scheduling rate from PCR to MCR.
0x06–
0x1E
— — Reserved, should be cleared.