cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 181

• Manufacturer Part Number: cx28394
• Description: Quad/x16/octal-t1/e1/j1 Framers
• Manufacturer: Conexant Systems, Inc.

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
TNRZ
TABORT
Table 3-19. Transmit Framer Position
TFORCE
100054E
071—Transmitter Configuration (TCR1)
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.
TABORT
TNRZ
7
0
0
1
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.
NOTE:
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.
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
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.
EMBED
TABORT
0 = TPOSO/TNEGO encoded per TZCS[1:0]
1 = TPOSO/TNEGO replaced by TNRZO/MSYNCO
0 = normal framer operation
1 = framer disabled
TABORT also interacts with EMBED [addr 0D0] to select which data stream is examined
0 = no effect
1 = force TX reframe
0
1
X
6
MSYNCO active (high) always marks the first bit of transmit multiframe according to
the selected transmit framer mode.
TFORCE
TFSYNC/TMSYNC
TFSYNC/TMSYNC
TSB Alignment
5
TPCMI
TLOFC
4
Conexant
Tx Alignment
Flywheel
Flywheel
TXDATA
TLOFB
3
TLOFA
2
Embedded Framing
Tx Framing Mode
Transmit Framing
Normal
TZCS[1]
3.12 Transmitter Registers
1
Table
3.0 Registers
TZCS[0]
Notes
(1–5)
(6–8)
(5, 6)
3-19.
0
3-59