Table 21. |
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Data on RX_DATA[7:0] |
| RX_FRAME_POSITION[3:0] |
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last byte of frame |
| 0000 |
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first A1 byte |
| 0001 |
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second A1 byte |
| 0010 |
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third A1 byte |
| 0011 |
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first A2 byte |
| 0100 |
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second A2 byte |
| 0101 |
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third A2 byte |
| 0110 |
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J0 byte |
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| 0111 |
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first Z0 byte |
| 1000 |
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last Z0 byte |
| 1001 |
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first byte after last Z0 byte | 1010 |
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second byte after last Z0 byte | 1011 |
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ADDR=0x102: Receive LOH Status |
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| Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 | |
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Bit name | Reserved | Reserved | RX_LAIS | RX_LRDI | Reserved | K1_UNSTAB | S1_UNSTAB | J0_OOF | |
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R/W | — | — | R | R | — | R | R | R | |
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Value | 0 | 0 | 1 | 0 | 0 | 0 |
| 0 | 1 |
after |
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reset |
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Bits | Reserved |
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Bit 5: | RX_LAIS: It will be asserted after the three LSBs of the received K2 byte are received as 111 for the | ||||||||
| number of consecutive frames specified in the K2_CONSEC_NUM [3:0] register. It will be de- | ||||||||
| asserted after the three LSBs of the received K2 byte are not received as 111 for the number of | ||||||||
| consecutive frames specified in the K2_CONSEC_NUM [3:0]. |
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Bit 4: RX_LRDI: It will be asserted after the three LSBs of the received K2 byte are received as 110 for the number of consecutive frames specified in the K2_CONSEC_NUM [3:0] register. It will be de- asserted after the three LSBs of the received K2 byte are not received as 110 for the number of consecutive frames specified in the K2_CONSEC_NUM [3:0].
Bit 3: Reserved
Bit 2: K1_UNSTAB: This bit is used to check for instability for K1 byte. Set if no three consecutive frames are received with identical K1 bytes for 12 successive frames.
Bit 1: S1_UNSTAB: The S1 LSB is checked for instability. If, for 12 successive frames, three consecutive frames are not received with identical S1 LSB in SDH mode, or eight consecutive frames are not received with identical S1 in SONET mode, the S1_UNSTAB bit is asserted. It is deasserted when the required number of identical S1 LSBs are received.
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