MK50H27PLCC datasheet(39/56 Pages) STMICROELECTRONICS

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4.3.3 Status Buffer

FIELD

DESCRIPTION

BIBT

The value of the last BIB transmitted.

BSNT

The value of the last BSN transmitted. 0

≤ BSNT ≤ 127.

BIBR

The value of the last BIB received.

BSNR

The value of the last BSN received.

≤ BSNR ≤ 127.

FIBT

The value of the last FIB transmitted.

FSNT/FSNC

Under normal operation this is the value of the last FSN transmitted.

If a UPRIM 13 is to be issued in CSR1 then the FSNC value to be

read by the MK50H27 must be placed here by the host.

≤ FSNT/FSNC ≤ 127.

FIBR

The value of the last FIB received.

FSNR

The value of the last FSN received. 0

≤ FSNR ≤ 127.

RFSN

The value of the oldest unacknowledged FSNT in the retransmission

buffer. 0

≤ RFSN ≤ 127.

FSNX

The value of the next expected FSN to be received. 0

≤ FSNX ≤ 127.

TIDX

Index to the descriptor of the current transmission buffer.

RIDX

Index to the descriptor of the current receive buffer.

RTIDX

Index to the first descriptor of the retransmission buffer.

PHASE

Indicates the current phase of operation for the device.

0:Power Off.

2:Out of Service.

4: Initial alignment not aligned.

5:Initial alignment aligned.

6:Initial alignment proving.

7:Alignment not ready.

8:Alignment ready.

9:In Service.

10:Processor outage.

11:Transparent mode.

12:Memory Error.

TX STATE

Indicates the current state of the transmitter.

0: The transmitter is waiting to transmit a Signal Unit.

1:A Signal Unit is currently being transmitted.

2:A Signal Unit transmission has completed.

RX STATE

Indicates the current state of the receiver.

0:The receiver is expecting the beginning of a Signal Unit.

1:A MSU is being transferred to the receive buffer(s).

2:End of frame detected.

3:Receive data being ignored.

4:Buffer chaining requested.

FIRMWARE RELEASE

Indicates the release number of the firmware within the MK50H27.

NUMBER

NUMBER OF OCTETS

This value represents the lower two bytes of the total number of octets

RETRANSMITTED

retransmitted. The number of octets retransmitted statistics counter

represents the upper two bytes of the total number of octets re-

transmitted.

This two byte status buffer value together with the two

byte error counter value provide a 32 bit value for the total num-

ber of octets retransmitted.

RESERVED

Must be programmed as ZEROES.

MK50H27

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