CX28394/28395/28398
3.0 Registers
Quad/x16/Octal—T1/E1/J1 Framers
3.12 Transmitter Registers
071—Transmitter Configuration (TCR1)
7
6
5
4
3
2
1
0
TNRZ
TABORT
TFORCE
TLOFC
TLOFB
TLOFA
TZCS[1]
TZCS[0]
TNRZ
Transmit NRZ Data—Transmit dual-rail unipolar outputs TPOSO/TNEGO are replaced by
non-return to zero unipolar data (TNRZO) and transmit multiframe sync (MSYNCO). Both
outputs are clocked on the rising edge of transmitter clock (TCKI). TNRZ must be written to 1
on the CX28395 device.
0 = TPOSO/TNEGO encoded per TZCS[1:0]
1 = TPOSO/TNEGO replaced by TNRZO/MSYNCO
NOTE:
MSYNCO active (high) always marks the first bit of transmit multiframe according to
the selected transmit framer mode.
TABORT
Abort/Disable TX Offline Framer—Offline framer ignores reframe requests from the online
framer (TLOF) and aborts any in progress TLOF reframe requests. Loss of frame status
[TLOF; addr 048] is not affected. While TABORT remains active, offline framer responds only
to the processor force reframe request (TFORCE), which allows the processor to manually
control reframe criteria or lock out changes in the current transmit frame alignment.
0 = normal framer operation
1 = framer disabled
TABORT also interacts with EMBED [addr 0D0] to select which data stream is examined
by online and offline transmit framer during embedded framing modes. If EMBED is active,
TXDATA output from TSLIP is examined and used to align the TX timebase. Otherwise,
TPCMI data stream is examined and used to align the TSB timebase as given in Table 3-19.
Table 3-19. Transmit Framer Position
TABORT
EMBED
TSB Alignment
Tx Alignment
Tx Framing Mode
Notes
0
0
TPCMI
Flywheel
TXDATA
Flywheel
Transmit Framing
Embedded Framing
Normal
(1–5)
(6–8)
(5, 6)
0
1
1
TFSYNC/TMSYNC
TFSYNC/TMSYNC
X
NOTE(S):
1. TFSYNC and TMSYNC must be programmed as outputs.
2. Offline framer examines TPCMI to supply TSB frame alignment.
3. Online framer examines TPCMI to supply TSB multiframe alignment.
4. SBI mode must match 2048k or 1544k line rate.
5. TX timebase flywheels at initial alignment until TSB_CTR or TX_ALIGN [addr 0D4].
6. TSB timebase flywheels if TFSYNC/TMSYNC programmed as outputs.
7. Offline framer examines TXDATA to supply TX frame alignment.
8. Online framer examines TXDATA to supply TX multiframe alignment.
TFORCE
Force TX Reframe (auto clear)—Forces the offline framer to perform a single reframe
according to the selected transmit framer mode. TFORCE is automatically cleared when the
framer acknowledges a request [ACTIVE; addr 017]. The processor does not typically need to
force reframe since online framer reframe request (TLOF) is active when reframe criteria
TLOFC–A is met. However, the processor may wish to force reframe if frame or CRC bit error
ratio indicates the framer has aligned to a mimic pattern.
0 = no effect
1 = force TX reframe
100054E
Conexant
3-59
CONEXANT [ CONEXANT SYSTEMS, INC ]
