PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
Register 06H: E1XCTransmit Framing Options
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
PATHCRC
Unused
0
X
X
1
0
0
0
0
Unused
R/W
R/W
R/W
R/W
R/W
TXSA4EN
TXSA5EN
TXSA6EN
TXSA7EN
TXSA8EN
PATHCRC:
The PATHCRC bit allows upstream block errors to be preserved in the
transmit CRC bits. If PATHCRC is a logic 1, the CRC-4 bits are modified to
reflect any bit values in BTPCM which have changed prior to transmission.
When PATHCRC is set to logic 0, the TRAN block is allowed to generate a
new CRC-4 value which overwrites the incoming CRC-4 word. For the
PATHCRC bit to be effective, the BTXMFP bit of the Transmit Backplane
Options register must be a logic 1; otherwise, the identification of the
incoming CRC-4 bits would be impossible. The PATHCRC bit only takes effect
if the GENCRC bit of the TRAN Configuration register (44H) is a logic 1 and
either the INDIS or FDIS bit in the same register are set to logic1.
TXSA4EN, TXSA5EN, TXSA6EN, TXSA7EN and TXSA8EN:
The TXSAxEN bits control the insertion of a data link into the Time Slot 0
National Use bits (Sa4 through Sa8).
These bits only have effect if the TRAN block Configuration DLEN bit is logic
0 or if the TRAN block Configuration SIGEN bit is logic 1. The TXSAxEN bits
take priority over the INDIS and FDIS bits of the TRAN block Configuration
register. The data link bits are still inserted if either INDIS or FDIS is logic 1.
If the TXDMASIG bit is a logic 1, the data link bits are sourced by the internal
HDLC transmitter; otherwise, the bits are sourced from the TDLSIG pin. If the
TXSA4EN bit is logic 1, the TDLSIG value is written into bit 4 of Time Slot 0 of
non-frame alignment signal frames. If the TXSA8EN bit is logic 1, the
TDLSIG value is written into bit 8 of Time Slot 0 of non-frame alignment signal
frames. The other enable bits operate in an analogous fashion. A clock pulse
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
82
PMC [ PMC-SIERRA, INC ]
