CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
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4.2.5 Parity
The
µ
PD98413 supports a parity signal for the transmit and receive interface.
(1) Transmit parity
At the transmit side of the ATM interface, the
µ
PD98413 checks a parity input by TXPRTY while TXENB_B is
asserted. If a parity error is detected, the
µ
PD98413 indicates the error by the APIET register.
The
µ
PD98413 supports both odd and even parity by setting the MDAPIT register. The default mode is odd.
(2) Receive parity
At the receive side of the ATM interface, the
µ
PD98413 always generates a parity over RXDATA[31:0] and
outputs by RXPRTY.
The
µ
PD98413 supports both odd and even parity by setting the MDAPIR register. The default mode is odd.
4.2.6 ATM Interface Error Detection
The
µ
PD98413 can detect some errors in the ATM interface and indicates the error by the register.
(1) Transmit error
At the transmit side of the ATM interface, the
µ
PD98413 detects the following errors and indicates the error by
the APIET register.
- Parity error (UTOPIA Interface)
The
µ
PD98413 checks a parity input by TXPRTY while TXENB_B is asserted. If a parity error is detected, the
µ
PD98413 indicates the error by the APIET register.
- Parity error (Transmit FIFO)
The
µ
PD98413 is generate the parity when transmit cell is stored in the transmit FIFO, and check the parity when
transmit cell is take out from the transmit FIFO. If a parity error is detected, the
µ
PD98413 indicate the error by
the APIET register.
- Cell Discard error
If the
µ
PD98413 detect Cell Discard, because TXCLAV is ignored and transmit FIFO is overflow occurred, the
µ
PD98413 indicate the error by the APIET register.
- TXENB_B and TSOC error
If the
µ
PD98413 detect that TXENB_B is deasserted or TSOC is asserted while a cell transfer, the
µ
PD98413
indicate the error by the APIET register.
Содержание NEASCOT-P65
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