BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 230
BT8375
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]
Datasheet
1.BT8375.pdf
(323 pages)
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3.17 System Bus Registers
3
3.17 System Bus Registers
Unused bits indicated by a dash (
X2CLK
SBI_OE
EMF
3-112
0D0—System Bus Interface Configuration (SBI_CR)
X2CLK
7
Enable Times 2 Clocks—X2CLK modifies the number of RSB/TSB clock cycles used to clock
a single data bit onto RSB and TSB. When X2CLK is active, two RSBCKI/TSBCKI clock
cycles occur for each RPCMO, RSIGO, SIGFRZ, TPCMI, and TSIGI bit. The FSYNC and
MSYNC signals remain at the full 1x RSBCKI/TSBCKI clock rate.
Enable System Bus Outputs—Places RPCMO, RSIGO, RINDO, and SIGFRZ output buffers
under the control of the RSB timebase. SBI_OE also places the TINDO output buffer under
the control of TSB timebase. Inactive (low) forces SBI output buffers to a high-impedance
state. Power-on and RESET [addr 001] force SBI_OE to an inactive state to avoid bus
contention on devices that share system bus connections.
Embedded Framing—During T1 mode, EMF controls placement of T1 framing bits on
RPCMO and the sampling of T1 framing bits from TPCMI. EMF supports system buses that
carry T1 frames but operate above T1 line rate. EMF allows the system bus to transport and
maintain 193-bit frame integrity while T1 data is passed through RSLIP and/or TSLIP buffers.
SBI_OE
6
—
EMF
) are reserved and should be written to 0. Writing to reserved bits has no effect.
5
0 = RSB/TSB signals at RSBCKI/TSBCKI
1 = Two SBCKI clock cycles per SBI bit (except FSYNC and MSYNC).
0 = SBI outputs forced to high-impedance state
1 = SBI outputs controlled by respective RSB or TSB timebase
0 = G.802 embedded format
1 = Reserved
EMBED
4
Conexant
SBI[3]
3
Fully Integrated T1/E1 Framer and Line Interface
SBI[2]
2
SBI[1]
Bt8370/8375/8376
1
N8370DSE
SBI[0]
0
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