DS2155 datasheet(187/262 Pages) DALLAS

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DS2156

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U_RCHEC

UTOPIA Receive Correctable HEC Counter Register

63h

Bit #

Name

RCHC7

RCHC6

RCHC5

RCHC4

RCHC3

RCHC2

RCHC1

RCHC0

Default

Bits 0 to 7/Receive Correctable HEC Counter (RCHC0 to RCHC7)

Note that write access to the receive PMON-counter latch-enable register latches all receive PMON-counter values

into temporary latch registers and clears the internal count values. This register holds the number of correctable

HEC-errored cells received since last latching. Note that this count corresponds to cells received when cell

delineation is in SYNC. A correctable HEC-errored cell is a cell with a single-bit error, provided single-bit HEC-

error correction is enabled through U_RCR1.1 and the receiver mode of operation is in correction mode.

Correctable HEC count value is unaffected if HEC-error correction is disabled.

U_RUHEC1

UTOPIA Receive Uncorrectable HEC Counter Register 1

64h

Bit #

Name

—

RUHC11 RUHC10 RUHC9

RUHC8

Default

Bits 0 to 3/Receive Uncorrectable HEC Counter (RUHC8 to RUHC11)

Bits 4 to 7/Unused

U_RUHEC2

UTOPIA Receive Uncorrectable HEC Counter Register 2

65h

Bit #

Name

RUHC7

RUHC6

RUHC5

RUHC4

RUHC3

RUHC2

RUHC1

RUHC0

Default

Bits 0 to 7/Receive Uncorrectable HEC Counter (RUHC0 to RUHC7)

The U_RUHEC1 and U_RUHEC2 registers count the number of uncorrectable HEC-errored cells received since

last latching. Note that this count corresponds to cells received when cell delineation is in SYNC. For every SYNC-

to-HUNT transition of the cell delineation state machine, the “Correctable + Uncorrectable” error-count value

increases by 6 instead of 7. For every SYNC-to-HUNT transition, if HEC correction is enabled, the correctable

HEC count increases by 1 and the uncorrectable HEC count increases by 5. If HEC correction is disabled,

correctable HEC count is not affected and uncorrectable HEC count increases by 6. Note that cell delineation goes

to HUNT state upon the reception of the 7th consecutive HEC pattern. Receive PMON counters are not updated

when cell delineation is out of SYNC state. Note that write access to the receive PMON-counter latch-enable

DS2155 Datasheet(PDF) 187 Page - Dallas Semiconductor

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