Motorola PowerQUICC II MPC8280 Series Reference Manual page 1151

Table 32-6 describes AAL1 CES protocol-specific RCT fields.
Table 32-6. AAL1 CES Protocol-Specific RCT Field Descriptions
Offset Bits Name
0x0E 0–3 SRTS_DEV Selects an SRTS device, whose address is SRTS_BASE[0–27] + SRTS_DEV[28–31].
4–7 —
8 PFM
9 SRT
10 INVE
11 STF
12-15 —
0x10 0–3 OCASB/SR
TS_TMP
4–9 —
10–15 VOS
0x12 0 SPV
1–3 —
4–15 SP
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Receive and Transmit Connection Tables (RCT, TCT)
The 16 byte-aligned SRTS_BASE is taken from the parameter RAM.
Reserved, should be cleared during initialization.
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).
Note that in CAS mode (CESM=1) this bit must be set by the user; see Section 32.4.1,
"Automatic Data Forwarding."
Structured format.
0 Unstructured format is used.
1 Structured format is used.
Note that although the structured format may be used, if the block size is one, the user
should clear STF. Only non P-format AAL1 cells are received. The receiver does not
check the AAL1 structured pointer because there is no need to when the block size is one.
Reserved, should be cleared during initialization.
OCASB applies when in CAS mode. Outgoing CAS Block. Points to one of the eight
available internal CAS blocks. The starting address of the table is
OUT_CAS_BLOCK_BASE+OCASB¥ 32. See Section 32.4.7.1, "CAS Routing Table" for
more details.
Note that the RCT and TCT use the same CAS routing table (CRT).
SRTS_TMP applies when not in CAS mode. Used by the CP to store the received SRTS
code. After a cell with SN = 7 is received, the CP writes the SRTS code to the external
SRTS device.
Note that when the receiver is in hunt mode SRTS information is not updated.
Reserved, should be cleared during initialization.
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.
Reserved, should be cleared during initialization.
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.
Chapter 32. ATM AAL1 Circuit Emulation Service
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Description
32-31