DS26401 datasheet(25/309 Pages) DALLAS

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DS26401 Octal T1/E1/J1 Framer

7.2 Global Register Description and Operation

GCR1

Global Control Register 1

0F0h

Bit #

Name

BBEDIM

BLOSIM

RLOFLTS

GIBO

REFCLKS

BWE

GCLE

GIPI

Default

Bit 0 / Global Interrupt Pin Inhibit (GIPI)

0 = Normal operation (interrupt pin (INT) toggles low on an unmasked interrupt condition)

1 = Interrupt inhibit (interrupt pin (INT) is forced high (inactive) when this bit is set)

Bit 1 / Global Counter Latch Enable (GCLE).

A low-to-high transition on this bit, when enabled, latches the framer

performance-monitor counters and the internal BERT counters. Each framer can be independently enabled to

accept this input, as well as the BERT. This bit must be cleared and set again to perform another counter latch.

Bit 2 / Bulk Write Enable (BWE).

When this bit is set, a port write to one of the octal ports is mapped into all 8

ports. This bit is useful for device initialization. It must be cleared before performing a read operation.

0 = Normal operation

1 = Bulk write is enabled

Bit 3 / Reference Clock-Frequency Select (REFCLKS).

This bit sets the divider ratio of the internal clock

generator depending on the frequency of the reference clock input.

0 = REF_CLK is 1.544MHz

1 = REF_CLK is 2.048MHz

Bit 4 / Ganged IBO Enable (GIBO).

This bit is used to select either the internal mux for IBO operation or externally

wire-OR operation. Normally this bit should be set = 0 and the internal mux is used.

0 = Use internal IBO mux

1 = Externally wire-OR TSERs and RSERs for IBO operation

Bit 5 / Receive Loss-of-Frame/Loss-of-Transmit Clock-Indication Select (RLOFLTS)

0 = RLOF/LOTCx pins indicate receive loss-of-frame

1 = RLOF/LOTCx pins indicate loss-of-transmit clock

Bit 6 / BERT Loss-of-Sync Interrupt Mask (BLOSIM)

0 = DS26401 does not generate an interrupt on INT for a BERT LOS

1 = DS26401 generates an interrupt on INT for a BERT LOS

Bit 7 / BERT Bit-Error-Detect Interrupt Mask (BBEDIM)

0 = DS26401 does not generate an interrupt on INT for a BERT bit-error detect

1 = DS26401 generates an interrupt on INT for a BERT bit-error detect

DS26401 Datasheet(PDF) 25 Page - Dallas Semiconductor

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