cx28365 Mindspeed Technologies, cx28365 Datasheet - Page 129

• Manufacturer Part Number: cx28365
• Description: X12, X6, X4 T3/e3 Framer And Atm Cell Transmission Convergence Sublayer Processor
• Manufacturer: Mindspeed Technologies

CX28365/6/4 Data Sheet
Table 3-9. Control Bit Function
0x18—RXHDR1 (Receive Cell Header Control Register 1)
RxHdr1[7:0]
0x19—RXHDR2 (Receive Cell Header Control Register 2)
RxHdr2[7:0]
500028C
RxHdr1[7]
RxHdr2[7]
DisLOCD
Setting
7
7
0
0
1
1
RxHdr1[6]
RxHdr2[6]
These bits hold the Receive Header values for Octet 1 of the incoming cell.
These bits hold the Receive Header values for Octet 2 of the incoming cell.
DisHECChk
Setting
6
6
0
1
0
1
The CX2836x contains two independent HEC Check state machines. The cell
delineator (CD) state machine is used to find cell delineation and conversely to
declare LOCD (loss of cell delineation). The cell valid (CV) state machine is used to
validate the cells that are passed to the UTOPIA FIFOs.
These state machines are controlled by two register bits that allow the CX2836x to be
programmed for special applications. The control bit function is shown in
The RXHDR1 register contains the first byte of the Receive Cell Header. The header
values direct ATM cells to the UTOPIA port if an incoming ATM cell header matches
the value in the header register. Receive Header Mask Registers further qualify ATM
cell reception. This header consists of 32 bits divided among four registers.
Default after reset: 00
The RXHDR2 register contains the second byte of the Receive Cell Header (see
0x18—RXHDR1).
Default after reset: 00
Preliminary Information/Mindspeed Proprietary and Confidential
RxHdr1[5]
RxHdr2[5]
Normal operation; used for standard ATM traffic.
Cells are output to the UTOPIA FIFO only after cell delineation is found. Only cells with valid
HECs are passed (this includes cells with single bit errors that have been corrected).
Ignore HEC Errors mode; used for IMA applications.
The cell delineator state machine is active and looking for valid ATM cells. It follows the ATM
Forum’s cell delineation process. However, since the cell valid state machine is turned off, the
CX2836x passes all cells, including those with HEC errors, to the UTOPIA FIFOs.
The CX2836x does not transfer cells during LOCD.
Not supported.
5
5
Mindspeed Technologies™
RxHdr1[4]
RxHdr2[4]
4
4
RxHdr1[3]
RxHdr2[3]
3
3
Effect
RxHdr1[2]
RxHdr2[2]
2
2
RxHdr1[1]
RxHdr2[1]
1
1
Table
RxHdr1[0]
RxHdr2[0]
0
0
Registers
3-9.
3
-
19