BT8370KPF

Manufacturer Part NumberBT8370KPF
DescriptionFully integrated T1/E1 framer and line interface
ManufacturerConexant Systems, Inc.
BT8370KPF datasheet
 


Specifications of BT8370KPF

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Transmitter Configuration

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Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
071— Transmitter Configuration (TCR1)
7
6
5
TNRZ
TABORT
TFORCE
Transmit NRZ Data—Transmit dual-rail unipolar outputs TPOSO/TNEGO are replaced by
TNRZ
non-return to 0 unipolar data (TNRZO) and transmit multiframe sync (MSYNCO). Both
outputs are clocked on the rising edge of transmitter clock (TCKI). Line encoding of bipolar
signals on XTIP/XRING is unaffected. MSYNCO active (high) always marks the first bit of
transmit multiframe according to the selected transmit framer mode.
Abort/Disable TX Offline Framer—The offline framer ignores reframe requests from the
TABORT
online framer (TLOF) and aborts any in progress TLOF reframe requests. The loss of frame
status [TLOF; addr 048] is not affected. While TABORT remains active, the offline framer
responds only to the processor force reframe request (TFORCE). This allows the processor to
manually control reframe criteria or lock out changes in the current transmit frame alignment.
TABORT 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, the
TPCMI data stream is examined and used to align the TSB timebase, as defined in
Table 3-19. Transmit Framer Position
TABORT
EMBED
TSB Alignment
0
0
0
1
TFSYNC/TMSYNC
1
X
TFSYNC/TMSYNC
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 2048 k or 1544 k 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.
Force TX Reframe (auto clear)—Forces the offline framer to perform a single reframe,
TFORCE
according to the selected transmit framer mode. TFORCE is automatically cleared when the
framer acknowledges a request [ACTIVE; addr 017]. The processor typically does not need to
force a reframe, because the online framer reframe request (TLOF) is active when reframe
criteria TLOFC–A is met. However, the processor may attempt force a reframe if the frame or
CRC bit error ratio indicates that the framer has aligned to a mimic pattern.
N8370DSE
4
3
TLOFC
TLOFB
0 = TPOSO/TNEGO encoded per TZCS[1:0]
1 = TPOSO/TNEGO replaced by TNRZO/MSYNCO
0 = normal framer operation
1 = framer disabled
Tx Alignment
TPCMI
Flywheel
TXDATA
Flywheel
0 = no effect
1 = force TX reframe
Conexant
3.12 Transmitter Registers
2
1
0
TLOFA
TZCS[1]
TZCS[0]
Table
3-19.
Tx Framing Mode
Notes
Transmit Framing
(1–5)
Embedded Framing
(6–8)
Normal
(5, 6)
3-71