PXF4336 Datasheet, PDF (211/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

ABM-P
PXF 4336 V1.1
Register Description
RXS
Receive Packet Start
A ‘1’ indicates that the first octets of a new packet are available in
registers UA5RXDAT0 and UA5RXDAT1 or DA5RXDAT0 and
DA5RXDAT1 respectively.
WAIT
Wait
A ‘1’ indicates that no valid octets are available in registers
UA5RXDAT0 and UA5RXDAT1 or DA5RXDAT0 and DA5RXDAT1
respectively. Read access to any read register while WAIT is asserted
results into an error interrupt.
SP
Segmentation Pending
A ‘1’ indicates that a cell is ready to be transmitted towards the ABM-P
core. A cell is ready either when 48 octets have been written to
UA5TXDAT0 and UA5TXDAT1 or DA5TXDAT0 and DA5TXDAT1
respectively or when the last cell is being built.
Bit ‘SP’ is set when the 48-byte transmit buffer is full and it is reset as
soon as at least 4-octet space is available for new octets. The
microprocessor has to poll this bit before writing the next 48-octet
bunch or beginning a new packet. If the microprocessor attempts to
write to UA5TXDAT0 and UA5TXDAT1 or DA5TXDAT0 and
DA5TXDAT1 respectively while ‘SP’ is set, an interrupt is generated
and the write access is delayed by the READY signal.
SAB
Segmentation Abort
A ‘1’ indicates that the transmission of a packet has been aborted
because the enable bit EN was reset by the microprocessor before the
transmission was completed. The AAL5 unit automatically closed the
packet with an abort sequence in the last cell (length field set to 0).
Note: Status bit ‘SE’ is not set in this case.
SE
Segmentation Ended
A ‘1’ indicates that the transmission of a packet has been completed
successfully.
Note: Status bits SP, SAB, SE are used for transmit, the others for receive.
Data Sheet
211
2001-12-17