Freescale Semiconductor MPC8260 - Manual (Page 1097)

ATM AAL2
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 32-35
32.5 AAL2 Parameter RAM
When configured for ATM mode, the FCC parameter RAM is mapped as shown in Table 32-13 . The table
includes both the fields for general ATM operation and also the fields specific to AAL2 operation.
Note that some of the values must be initialized by the user, but values updated by the CP should not be
modified by the user.
2
When RAS timer expires the RxBD is closed with RAS timer expired indication, the Last (L) bit is not set, and RXF
interrupt is not issued. A new RxBD is opened for the next incoming AAL2 packet and the frame is processed as
normal and is treated as a new frame. When the next SSSAR end-of-frame indication is received, the RxBD at that
time is closed with an L indication, and if RxQD[RFM] = 1, the receiver issues an RXF interrupt.
Table 32-13. AAL2 Parameter RAM
Offset Name Width Description
0x00–
0x3F — — Reserved. Should be cleared during initialization.
0x40 RCELL_TMP_BASE Hword Rx cell temporary base address. Points to a total of 64 bytes reserved
dual-port RAM area used by the CP. Should be 64 byte aligned.
User-defined. (Recommended address space: 0x3000–0x4000 or
0xB000–0xC000.)
0x42 TCELL_TMP_BASE Hword Tx cell temporary base address. Points to total of 64 bytes reserved
dual-port RAM area used by the CP. Should be 64-byte aligned.
User-defined.
(Recommended address space: 0x3000–0x4000 or 0xB000–0xC000.)
0x44 UDC_TMP_BASE Hword UDC mode only. Points to a total of 32 bytes reserved dual-port RAM
area used by the CP. Should be 64-byte aligned. User-defined.
(Recommended address space: 0x3000–0x4000 or 0xB000–0xC000.)
0x46 INT_RCT_BASE Hword Internal receive connection table base. User-defined.
0x48 INT_TCT_BASE Hword Internal transmit connection table base. User-defined.
0x4A INT_TCTE_BASE Hword Internal transmit connection table extension base. User-defined.
0x4C RAS_Timer_Duration Word Contains the RAS_Timer duration in microseconds for the SSSAR
sublayer. User-defined.
0x50 EXT_RCT_BASE Word External receive connection table base. User-defined.
0x54 EXT_TCT_BASE Word External transmit connection table base. User-defined.
0x58 EXT_TCTE_BASE Word External transmit connection table extension base. User-defined.
0x5C UEAD_OFFSET Hword User-defined cells mode only. The offset of the UEAD entry in the UDC
extra header. Should be an even address. If RCT[BO]=01
UEAD_OFFSET should be in little-endian format. For example if UEAD
entry is the first half word of the extra header in external memory,
UEAD_OFFSET should be set to 2 (second half word entry in internal
RAM).
0x5E RxQD_Base_Int Hword Points to the base address of the internal RxQD table. The pointer should
be 32-byte aligned. User-defined.
0x60 PMT_BASE Hword Performance monitoring table base. User-defined.