Motorola PowerQUICC II MPC8280 Series Reference Manual page 1066

ATM Memory Structure
Table 31-19 describes AAL1 protocol-specific RCT fields.
Table 31-19. AAL1 Protocol-Specific RCT Field Descriptions
Offset Bits Name
0x0E 0–7 —
8 PFM
9 SRT
10 INVE
11 STF
12–15 —
0x10 0–3 SRTS_TMP Used by the CP to store the received SRTS code. After a cell with SN = 7 is received,
4–11 —
12–15 SRTS_DEV Selects an SRTS device, whose address is SRTS_BASE[0–27] + SRTS_DEV[28–31].
0x12 0–1 —
2–7 VOS
8 SPV
9–15 SP
0x14 — RBDCNT
0x16 0–12 —
13–15 SN
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Reserved, should be cleared.
Partially filled mode.
0 Partially filled cells mode is not used.
1 Partially filled cells mode is used. The receiver copies only valid octets from the AAL1
cell to the Rx buffer. The number of the valid octets from the beginning of the AAL1
user data field is specified in the VOS (valid octet size) field.
Synchronous residual time stamp. Unstructured format only. The MPC8280 supports
clock recovery using an external SRTS PLL. The MPC8280 tracks the SRTS from the
incoming four cells with SN = 1, 3, 5, and 7 and writes it to the external SRTS device.
Every eight cells the CP writes a valid SRTS to external logic. (See Section 31.16,
"SRTS Generation and Clock Recovery Using External Logic.")
0 SRTS mode is not used.
1 SRTS mode is used.
Inverted empty.
0 RxBD[E] is interpreted normally (1 = empty, 0 = not empty).
1 RxBD[E] is handled in negative logic (0 = empty, 1 = not empty).
Structured format
0 Unstructured format is used.
1 Structured format is used.
Reserved, should be cleared.
the CP writes the SRTS code to the external SRTS device.
Reserved, should be cleared.
The 16 byte-aligned SRTS_BASE is taken from the parameter RAM.
Reserved, should be cleared.
Valid octet size. Specifies the number of valid octets from the beginning of the AAL1
user data field. For unstructured, service values 1–47 are valid; for structured service,
values 1-46 are valid. Partially filled cell mode only.
Structured pointer valid. Should be user-initialized user to zero. Structured format only.
Structured pointer. Used by the CP to calculate the structured pointer. This field should
be initialized by the user to zero. Used in structured format only.
RxBD count. Indicates how may bytes remain in the current Rx buffer. Initialized with
MRBLR whenever the CP opens a new buffer.
Reserved, should be cleared.
Sequence number. Used by the CP to check incoming cell's sequence number.
MPC8280 PowerQUICC II Family Reference Manual
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