DS26401 datasheet(176/309 Pages) DALLAS

176 / 309 page

DS26401 Octal T1/E1/J1 Framer

176

ERCNT

Error Counter Configuration Register

086h + (200h x n) : where n = 0 to 7, for Ports 1 to 8

Bit #

Name

1SECS

MCUS

MECU

ECUS

EAMS

—

LCVCRF

Default

Bit 0 / E1 Line Code Violation Count Register Function Select (LCVCRF)

0 = do not count excessive zeros

1 = count excessive zeros

Bits 1, 2 / Unused. Must be set = 0 for proper operation.

Bit 3 / Error Accumulation Mode Select (EAMS)

0 = ERCNT.4 determines accumulation time (timed update)

1 = ERCNT.5 determines accumulation time (manual update)

Bit 3 / Error Accumulation Mode Select (EAMS)

0 = ERCNT.4 determines accumulation time (timed update)

1 = ERCNT.5 determines accumulation time (manual update)

Bit 4 / Error Counter Update Select (ECUS)

T1 mode:

0 = Update error counters once a second

1 = Update error counters every 42ms (336 frames)

E1 mode:

0 = Update error counters once a second

1 = Update error counters every 62.5ms (500 frames)

Bit 5 / Manual Error Counter Update (MECU).

When enabled by ERCNT.3, the changing of this bit from a 0 to a 1

allows the next clock cycle to load the error counter registers with the latest counts and reset the counters. The user

must wait a minimum of 250

ms before reading the error count registers to allow for proper update.

Bit 6 / Manual Counter Update Select (MCUS).

When manual update mode is enabled with EAMS, this bit can

be used to allow the GLCE bit in GCR1 to latch all counters. Useful for synchronously latching counters of multiple

framers.

0 = MECU is used to manually latch counters.

1 = GLCE is used to manually latch counters.

Bit 7 / One-Second Select (1SECS).

When timed update is enabled by EAMS, setting this bit for a specific framer

will allow that framer’s counters to latch on the one-second reference from framer #1. Note that this bit should

always be clear for framer #1.

0 = Use internally generated one-second timer.

1 = Use 1 second timer from framer #1.

DS26401 Datasheet(PDF) 176 Page - Dallas Semiconductor

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