cn8223 Mindspeed Technologies, cn8223 Datasheet - Page 48

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

2.0 Functional Description
2.3 Overhead Generation
2.3.2 Internal G.832 E3/E4 Modes
Table 2-9. G.832 E3 and E4 Overhead Values
2.3.3 Internal G.751 E3 Mode
2-14
FA1/FA2
EM
TR
MA
NR
GC
P1
P2
Overhead Bits
Inserts standard values (0xF6, 0x28) or can be inserted externally through port TXOVH[7:0]. If this
bit is disabled, the value is 0x00.
Calculates and inserts BIP8. Errors can be inserted using the TXFEAC_ERRPAT register. Allows
single error insertion or all 0 value (continuous error).
Always inserted through port TXOVH[7:0].
Calculates and inserts line FEBE based on incoming EM errors. Can be set for FEBE = all 1s or all 0s.
Inserts FERF and timing marker from register. Can be disabled to all-0s or inserted from
TXOVH[7:0].
Always inserted through port TXOVH[7:0].
Inserted externally through port TXOVH[7:0] or from internal HDLC formatter, if enabled.
E4 mode only. Always inserted through port TXOVH[7:0].
E4 mode only. Always inserted through port TXOVH[7:0].
All framing overhead is generated automatically and the BIP octet is calculated
and inserted in the EM position. The BIP field can be errored using the
TXFEAC_ERRPAT register [0x03] and BIP Error Insert [bits 12–10 of
CONFIG_2 [0x01]. All undefined overhead octets are inserted externally as
described in
all 0s) using Overhead Control [bits 3–0] of CONFIG_2 [0x01]. Internally
generated octets are FA1, FA2, EM, and MA. Overhead generation of G.832 E3
and E4 values is summarized in
The FAS pattern is automatically generated by the transmitter circuitry. The
transmitter also inserts the A bit as determined from Transmit Alarm Control
[bit 6] of CONFIG_2 [0x01]. Overhead generation of G.751 E3 values is
summarized in
Table 2-10. G.751 E3 Overhead Values
Overhead Bits
FAS
N
A
Section
Table
Conexant
2.3.5, and individual overhead octets can be disabled (set to
2-10.
10-bit pattern internally generated—1111010000. No error
insertion.
Alarm bit set from CONFIG_2, bit 6.
Data or all 1s from internal HDLC formatter when enabled.
CN8223 Operation
Table
ATM Transmitter/Receiver with UTOPIA Interface
2-9.
CN8223 Operation
100046D
CN8223