BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 155

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
TCKI[1:0]
TMUX[5:0]
TEST
N8370DSE
01B—Test Mux Configuration (TMUX)
01C—Test Configuration (TEST)
—
—
7
7
TCKI Source Select—The internal transmit clock mux selects 1 of four clock signals. The
selected clock signal is applied to the transmit clock monitor and is a timing reference for the
digital transmitter block. This clock signal must operate at the T1/E1 line rate. If TJAT is
disabled [JDIR; addr 002], the selected clock signal also appears on TCKO pin. TCKI input
pin is ignored when a clock source other than TCKI is selected.
TNRZ bit in TCR1 register [addr 071] is set and TPOSO/TNEGO/TCKO outputs are selected
and enabled. Otherwise, during normal mode (integrated LIU and framer) TCKO follows
JCLK if JAT is enabled in the Transmit direction. TCKO follows TCKI if the JAT is either in
the receiver or is disabled.
Test Mux Configuration—Reserved for CONEXANT production test.
Global Test Enable—Reserved for CONEXANT production test.
—
—
TCKO follows TCKI during NRZ mode (framer mode only). NRZ mode is detected when
6
6
TMUX[5]
TCKI[1:0]
—
5
5
00
01
10
11
TMUX[4]
TCKI Source
—
4
4
RSBCKI
CLADO
Conexant
RCKO
TCKI
TMUX[3]
—
3
3
Pin
Pin
TMUX[2]
3.6 Primary Control and Status Registers
—
2
2
Normal transmit (With TSLIP)
Internal RCKO (before output
buffer)
Transmit slaved to RSB
Internal CLAD (before output
buffer).
TMUX[1]
TEST[1]
1
1
Notes
3.0 Registers
TMUX[0]
TEST[0]
0
0
3-37