Bt8370/8375/8376
3.0 Registers
Fully Integrated T1/E1 Framer and Line Interface
3.6 Primary Control and Status Registers
TCKI[1:0]
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.
TCKO follows TCKI during NRZ mode (framer mode only). NRZ mode is detected when
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.
TCKI[1:0]
TCKI Source
TCKI
Notes
00
01
Pin
Pin
Normal transmit (With TSLIP)
RCKO
Internal RCKO (before output
buffer)
10
11
RSBCKI
CLADO
Transmit slaved to RSB
Internal CLAD (before output
buffer).
01B—Test Mux Configuration (TMUX)
7
6
5
4
3
2
1
0
—
—
TMUX[5]
TMUX[4]
TMUX[3]
TMUX[2]
TMUX[1]
TMUX[0]
TMUX[5:0]
Test Mux Configuration—Reserved for CONEXANT production test.
01C—Test Configuration (TEST)
7
6
5
4
3
2
1
0
—
—
—
—
—
—
TEST[1]
TEST[0]
TEST
Global Test Enable—Reserved for CONEXANT production test.
N8370DSE
Conexant
3-37
CONEXANT [ CONEXANT SYSTEMS, INC ]
