AK2504A Просмотр технического описания (PDF) - Asahi Kasei Microdevices

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производитель

AK2504A

DS3/STS-1/E3 Transceiver

Asahi Kasei Microdevices 

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

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