Motorola PowerQUICC II MPC8280 Series Reference Manual page 1054

ATM Memory Structure
mechanism as described for ATM-to-TDM automatic forwarding; see Section 31.9.1,
"Automatic Data Forwarding."
31.10 ATM Memory Structure
The ATM memory structure, described in the following sections, includes the parameter
RAM, the connection tables, OAM performance monitoring tables, the APC data structure,
BD tables, the AAL1 CES sequence number protection table and the UNI statistics table.
31.10.1 Parameter RAM
When configured for ATM mode, the FCC parameter RAM is mapped as shown in
Table 31-11. Note that there are additional parameters for AAL1 CES (refer to Table 32-4)
and AAL2 (refer to Table 33-13).
1
Offset Name
0x00–0x3F —
0x40 RCELL_TMP_
BASE
0x42 TCELL_TMP_BASE
0x44 UDC_TMP_BASE
0x46 INT_RCT_BASE
0x48 INT_TCT_BASE
0x4A INT_TCTE_BASE
0x4C —
0x50 EXT_RCT_BASE
0x54 EXT_TCT_BASE
0x58 EXT_TCTE_BASE
0x5C UEAD_OFFSET
31-40
Freescale Semiconductor, Inc.
Table 31-11. ATM Parameter RAM Map
Width
— Reserved, should be cleared.
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 offset from dual-port RAM 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 offset from dual-port RAM base.
Hword UDC mode only. Points to a total of 64 bytes reserved dual-port RAM area
used by the CP. Should be 64-byte aligned. User-defined offset from
dual-port RAM base.
Hword Internal receive connection table base. User-defined offset from dual-port
RAM base.
Hword Internal transmit connection table base. User-defined offset from
dual-port RAM base.
Hword Internal transmit connection table extension base. User-defined offset
from dual-port RAM base.
Word Reserved, should be cleared.
Word External receive connection table base. User-defined.
Word External transmit connection table base. User-defined.
Word External transmit connection table extension base. User-defined.
Hword User-defined cells mode only. Offset to the user-defined extended
address (UEAD) in the UDC extra header. Must be an even address. See
Section 31.10.1.1, "Determining UEAD_OFFSET (UEAD Mode Only)."
If RCT[BO] = 01, UEAD_OFFSET should be in little-endian format. For
example, if the UEAD entry is the first half word of the extra header in
external memory, UEAD_OFFSET should be programmed to 2 (second
half word entry in dual-port RAM).
MPC8280 PowerQUICC II Family Reference Manual
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