AK2504A Datasheet, PDF (12/30 Pages) List of Unclassifed Manufacturers – DS3/STS-1/ES Transceiver

ASAHI KASEI
[AK2504A]
Logic Data Interface
AK2504A can handle Positive/Negative data and NRZ data.
Positive/Negative data Interface
If NRZ pin = Low, the transmitter accepts Positive/Negative transmit data on TPDATA/TNDATA and the receiver
outputs Positive/Negative received data on RPDATA/RNDATA. In this mode, B3ZS/HDB3 Encoder/Decoder is
disable. Transmit and Received data is output transparently.
NRZ data Interface
If NRZ pin = High, the transmitter accepts NRZ transmit data on TPDATA (TNDATA should be tied to VSS).
The receiver outputs NRZ received data on RPDATA. In this mode, B3ZS/HDB3 Encoder/Decoder is enable.
LCV alarm will be indicated on RNDATA whenever a bipolar violation is detected in the incoming data stream.
Low
High
TPOS
TNEG
RPOS
RNEG
NRZ
TPDATA
TNDATA
RPDATA
RNDATA
Disable
B3ZS
HDB3
Encoder
Decoder
TNRZ
RNRZ
BPV
NRZ
TPDATA
TNDATA
RPDATA
RNDATA
Enable
B3ZS
HDB3
Encoder
Decoder
Positive/Negative AMI
NRZ
Fig. 4 Logic Data Interface
Line Code Violation
If a bipolar violation not corresponding to the appropriate coding rule or a code error is detected in the incoming
data stream, LCV is set high for one bit period. The violation pulse corresponding to the appropriate coding rule is
removed from the incoming data.
Bipolar Violation
B3ZS, HDB3 : B, V
(+1,+1) or (-1,–1)
→
HDB3:
B, 0, V (+1, 0,+1) or (-1, 0,–1) →
RPDATA ---
LCV
---
RPDATA ---
LCV
---
1, 1
0, 1
1, 0, 1
0, 0, 1
Coding Violation (With an even number of Bs since the last V)
B3ZS :
0, V
( 0,+1) or ( 0,–1)
→
RPDATA ---
LCV
---
HDB3:
0, 0, V ( 0, 0,+1) or ( 0, 0,–1)
→
RPDATA ---
LCV
---
0, 1
0, 1
0, 0, 1
0, 0, 1
MS0143-E-01
- 12 -
2004/01