DS26401 datasheet(146/309 Pages) DALLAS

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DS26401 Octal T1/E1/J1 Framer

146

9.21 Interfacing the T1 Tx Formatter to the BERT

Data from the BERT can be inserted into the DS26401 transmit formatter data stream by using the registers

described below. Either framed or unframed format can be transmitted, controlled by the TBFUS bit in the TBICR.

Any signal DS0, combination of DS0s, or the entire bandwidth can be replaced with the BERT data as controlled by

the TBCS registers.

Note that one BERT resource is shared between all 8 framers. Therefore, the TBEN bit should be set for only one

framer at a time. If multiple framers have the TBEN bit set, the lower number framer will be assigned the resource.

TBICR

Transmit BERT Interface Control Register

18Ah + (200h x n) : where n = 0 to 7, for Ports 1 to 8

Bit #

Name

—

TBDC

TBFUS

TBEN

Default

Bit 0 / Transmit BERT Enable (TBEN)

0 = Transmit BERT is not assigned to this framer.

1 = Transmit BERT is assigned to this framer.

Bit 1 / Transmit BERT Framed/Unframed Select (TBFUS)

0 = The framer will not provide data from the F-bit position (framed)

1 = The framer will clock data from the F-bit position (unframed)

Bit 2 / Transmit BERT Direction Control (TBDC)

0 = Transmit Path: The BERT transmits toward the network via the TPOS and TNEG pins.

1 = Backplane: The BERT transmits toward the system backplane via the RSER pin.

Bits 3 to 7 / Unused. Must be set = 0 for proper operation.

TBCS1, TBCS2, TBCS3

Transmit BERT Channel Select Registers

0D4h, 0D5h, 0D6h [+ (200h x n) : where n = 0 to 7, for Ports 1 to 8]

Setting any of the CH1 through CH24 bits in the TBCS1 through TBCS3 registers will map data from those

channels to the on-board BERT. TBEN must be set to one for these registers to function. Multiple, or all channels

may be selected simultaneously. These registers affect the transmit-side framer only.

(MSB)

(LSB)

CH8

CH7

CH6

CH5

CH4

CH3

CH2

CH1

TBCS1

CH16

CH15

CH14

CH13

CH12

CH11

CH10

CH9

TBCS2

CH24

CH23

CH22

CH21

CH20

CH19

CH18

CH17

TBCS3

DS26401 Datasheet(PDF) 146 Page - Dallas Semiconductor

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