CS62180 datasheet(18/50 Pages) CIRRUS

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Transmit Transparent Registers (TTR)

The Transmit Transparent Registers allow indi-

vidual DS0 channels to be programmed clear,

disabling robbed bit signaling and B7 zero sup-

pression for that channel (if selected, B8ZS is

unaffected by transparent channels). There are 3

TTR registers: TTR1, TTR2, and TTR3. Each bit

in the TTR registers corresponds to a DS0 chan-

nel: TTR1.0 = channel 1, TTR1.7 = channel 8,

TTR2.7 = channel 16, etc. A channel is pro-

gra mmed cl ear b y sett ing the bit whic h

corresponds to that channel in the appropriate

TTR register. See Figure 11.

Transmit Idle Registers (TIR)

By setting the appropriate bits in the Transmit

Idle Registers, individual DS0 channels can be

replaced with the idle code selected via TCR.3

(see above). If the idle channel is not also pro-

grammed clear (via TTR1 - TTR3), the code

may be corrupted during signaling frames if

robbed bit signaling is enabled (TCR.4 = 1).

There are 3 TIR registers: TIR1, TIR2, and

TIR3. Each bit in the TIR registers corresponds

to a DS0 channel: TIR1.0 = channel 1, TIR1.7 =

channel 8, TIR2.7 = channel 16, etc. A channel

is programmed idle by setting the bit which cor-

responds to that channel in the appropriate TIR

Transmission Insertion Hierarchy

Figures 13a - 13c give an overview of the deci-

sion hierarchy which determines the final

composition of the output stream. It shows the

various control options as inputs into decision

branches of the flow chart, and the order in

which the various optional signals are muxed

into the final data stream.

(MSB)

543210

(LSB)

TIR1

CH8

CH7

CH6

CH5

CH4

CH3

CH2

CH1

TIR2

CH16

CH15

CH14

CH13

CH12

CH11

CH10

CH9

TIR3

CH24

CH23

CH22

CH21

CH20

CH19

CH18

CH17

"0" = Normal

"1" = Corresponding DS0 Channel is Replaced with Idle Code. (See TCR.3)

Figure 12. Transmit Idle Registers (TIR1 - TIR3)

(MSB)

543210

(LSB)

TTR1

CH8

CH7

CH6

CH5

CH4

CH3

CH2

CH1

TTR2

CH16

CH15

CH14

CH13

CH12

CH11

CH10

CH9

TTR3

CH24

CH23

CH22

CH21

CH20

CH19

CH18

CH17

"0" = Normal

"1" = Corresponding DS0 Channel is Transparent. (Not signaling or B7 Insertion.)

Figure11. Transmit Transparent Registers (TTR1 - TTR3)

CS62180B

DS225PP2

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