Freescale Semiconductor MPC8260 - Manual (Page 1094)

ATM AAL2
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
32-32 Freescale Semiconductor
Table 32-11 describes the SSSAR RxQD fields.
.
0 10 11 12 13 14 15
Offset + 0x00 — RasT RBM RFM SubType
Offset + 0x02 RxBD Table Offset
Offset + 0x04 RxBD Table Base
Offset + 0x06
Offset + 0x08 —
Offset + 0x0A
Offset + 0x0c Time Stamp
Offset + 0x0e
Offset + 0x10 —
Offset + 0x12 —
Offset + 0x14 MRBLR
Offset + 0x16 Max_SSSAR_SDU_Length
Offset + 0x18 —
Offset + 0x1A
Offset + 0x1C
Offset + 0x1E
Figure 32-20. SSSAR Rx Queue Descriptor
Table 32-11. SSSAR RxQD Field Descriptions
Offset Bits Name
1
Description
0x00 0–10 — Reserved, should be cleared during initialization.
11 RasT Ras Timer enable.
0 Ras Timer disabled (Time Stamp field is still valid)
1 Ras Timer enabled. The Ras Timer duration is set by the Ras Timer Duration
parameter in the parameter RAM. If the current SSSAR SDU is not completed
before the RasTimer expires, the BD is closed showing the Ras_Timer expired (TE)
(SSSAR RxBD[RxError] = 01) and the next packet starts a new SDU.
12 RBM Receive buffer mask.
0 Disable receive buffer interrupt
1 Enable receive buffer interrupt
13 RFM Receive frame mask.
0 Disable receive frame interrupt
1 Enable receive frame interrupt
14-15 SubType Sublayer type. Should be 10 (SSSAR) for this descriptor.
00 CPS sublayer
01 CPS switched
10 SSSAR
11 Reserved