Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 990

Buffer Descriptors and Connection Tables
0
CT_Offset + 0 FHNT
CT_Offset + 2
CT_Offset + 4
CT_Offset + 6 ITQ PPD
CT_Offset + 8
CT_Offset + A
CT_Offset + C
CT_Offset + E
CT_Offset + 10
CT_Offset + 12
CT_Offset + 14
CT_Offset + 16 FT
CT_Offset + 18
to
CT_Offset + 1F
Table 37-4 describes the PTP-specific fields in an RCT.
CT Offset Bits
0x00 0
1–9
10
11
12
37-16
1 2 3 4 5
—
ATR BATR AVCO
ADDRESS TRANSLATION HEADER
NIM
Figure 37-9. PTP Receive Connection Table (PTP RCT)
Table 37-4. PTP RCT Field Descriptions
Name
FHNT Frame hunt mode. Indicates that this channel has had a busy exception or a
restart and is currently in frame hunt mode. In frame hunt mode the CP
discards all received cells until a new frame is started (indicated by the CPI bit
of the last cell header). FHNT is cleared by the user during initialization, and is
modified accordingly by the CP thereafter.
0 Not in frame hunt mode
1 In frame hunt mode
— Reserved, should be cleared.
NCRC NCRC—No CRC (AAL0 only). NCRC is used to disable CRC10 calculations. If
CRC10 is not required for this channel, set this bit to gain better CPM utilization.
0 Perform CRC10 calculations.
1 Disable CRC10 calculations.
— Reserved, should be cleared.
PTP Port-to-port cell switching. Setting this bit turns a regular RCT into a PTP RCT,
so it should be set in this context.
0 Normal AAL0 mode.
1 Activate the port-to-port switching mechanism.
MPC885 PowerQUICC Family Reference Manual, Rev. 2
6 7 8 9 10
NCRC
WCOUNT
PTP_TX_CH
SCC# IAQ — —
APC_LEVEL
PTP_BD_PTR
PTP_BASE
—
IMASK
RPMT
—
Description
11 12 13 14 15
— PTP CDIS —
PHY
Freescale Semiconductor