cn8223 Mindspeed Technologies, cn8223 Datasheet - Page 42

• Manufacturer Part Number: cn8223
• Description: Atm Transmitter/receiver With Utopia Interface
• Manufacturer: Mindspeed Technologies

2.0 Functional Description
2.2 Line Framers
2.2.3 Externally Framed Transmit Line Interface
Figure 2-7. DS1 Interface Transmit Timing
2-8
TXDATO
TXCKI
TXSYI
7
8
S
In external framer mode, the transmitter inputs are a clock and a synchronization
signal that indicate the position of framing bits in the DS1, E1, DS3, or E3
framing signal. The transmit data stream output is a single serial output. The
synchronization signal period can be any multiple of the frame period.
framer modes. These interfaces are compatible with Conexant framers Bt8360 for
DS1, Bt8510 for E1, Bt8370 for E1/T1, and Bt8330B for DS3 and E3. Interface
connections for these serial, external framing modes are given in
Table 2-6. Serial External Framer Transmitter Interface Connection
1.544 MHz. TXSYI has a rising edge prior to the sampling of the frame bit. This
signal does not have to be present at every frame; in particular, it can be a
superframe synchronization signal with a period of 3 ms. TXDATO is the output
signal; it transitions in response to the rising edge of TXCKI and can be sampled
on the following falling edge. The framing bit position content in the output
stream is undefined.
Transmit Clock Input (TXCKI)
Transmit Sync Input (TXSYI)
Transmit Data Output (TXDATO)
2
Functional timing for the transmit line interface is similar for all external
Figure 2-7
3
Channel 24
4
Signal Name
illustrates the transmit timing for the DS1 interface. TXCKI is
5
Conexant
6
7
8
ATM Transmitter/Receiver with UTOPIA Interface
F
TXCKI
TXIN
TXOUT[3]
S
2
Connect to CN8223 Pin
3
4
Channel 1
5
Table
6
7
2-6.
100046D
CN8223