cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 79

• Manufacturer Part Number: cx28394
• Description: Quad/x16/octal-t1/e1/j1 Framers
• Manufacturer: Conexant Systems, Inc.

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
2.3.1 Non-Multiplexed Mode
100054E
2.3 System Bus
Each framer provides high-speed, transmit and receive serial TDM interfaces.
These interfaces can be configured as non-multiplexed, individual system buses,
or they can be multiplexed internally or externally to provide 2xE1 (4096 Mbps)
and 4xE1 (8192 Mbps) buses. The system bus is compatible with the Mitel
ST-Bus, the Siemens PEB Bus, and the AT&T CHI Bus and directly connects to
other Conexant serial TDM bus devices without the need for any external
circuitry. The following five bus rates are supported:
In Non-Multiplexed mode, each framer has a separate system bus interface
consisting of the following pin functions:
Receive System Bus (RSB)
RSBCKI
RPCMO
RFSYNC/RMSYNC
RINDO/RDLCKO
RSIGO/RDLO
SIGFRZ
[addr 018].
Framer Control register [FCR; addr 080] must be zero to disable Internally
Multiplexed mode. The system bus rate is independent of the line rate and must
be selected using SBI[3:0] in the System Bus Interface Configuration register
[SBI_CR; addr 0D0]. Register bit SBI_OE [SBI_CR; addr 0D0] must also be set
to 1 to enable system bus outputs.
• 1.536 MHz—T1 rate, 24 time slots, without framing bit
• 1.544 MHz—T1 rate with framing bit
• 2.048 MHz—E1 rate, 32 time slots
• 4.096 MHz—twice the E1 rate, 64 time slots
• 8.192 MHz—four times the E1 rate, 128 time slots
The signal available on dual function pins is controlled using register PIO
To use Non-Multiplexed mode, SBIMODE[0] and/or SBIMODE[1] in the
Conexant
TSIGI/TDLI
Transmit System Bus (TSB)
TSBCKI
TPCMI
TFSYNC/TMSYNC
TINDO/TDLCKO
—
2.0 Circuit Description
2.3 System Bus
2-21