BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 63
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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Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
2.5.1 Timebase
N8370DSE
The RSB timebase synchronizes RFSYNC, RMSYNC, and RINDO with the
Receive System Bus Clock (RSBCKI). The RSBCKI can be slaved to 4 clock
sources: Receive System Bus Clock Input (RSBCKI), Transmit System Bus
Clock Input (TSBCKI), Clock Rate Adapter Input (CLADI), or Clock Rate
Adapter Output (CLADO). The RSB clock selection is made through the Clock
Input Mux register [CMUX; addr 01A]. The system bus clock can also be
configured to run at twice the data rate by setting the X2CLK bit in the System
Bus Interface Configuration register [SBI_CR; addr 0D0].
[PIO; addr 018]. RFSYNC and RMSYNC must be configured as inputs when the
RSB timebase is slaved to the system bus [SBI_OE; addr 0D0]. RFSYNC and
RMSYNC must be configured as outputs when the RSB timebase is master of the
system bus. RFSYNC and RMSYNC can also be configured as rising or falling
edge outputs [RSB_CR; addr 0D1]. In addition to having RFSYNC and
RMSYNC active on the frame boundary, a programmable offset is available to
select the time slot and bit offset in the frame. See the Receive System Bus Sync
Time Slot Offset [RSYNC_TS; addr 0D3] and the Receive System Bus Sync Bit
Offset [RSYNC_BIT; addr 0D2].
RFSYNC and RMSYNC can be individually configured as inputs or outputs
Conexant
2.0 Circuit Description
2.5 Receive System Bus
2-35
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