CS62180 datasheet(16/50 Pages) CIRRUS

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Transmitter Control Register (TCR)

When in host mode, there are a number of op-

tions available for transmitter configuration

which can be enabled via the Transmit Control

(TTR1 - TTR3), and Transmit Idle Registers

(TIR1 - TIR3). Serial read and write operations

to access these registers are explained in the Se-

rial Interface section above. When operating in

hardware mode, all control bits in the TCR de-

fault to "0" (except TCR.4, which defaults to "1"

to enable bit-robbed signaling), and dynamic

control is limited to the mode control pins as de-

scribed under hardware mode below.

The TCR provides control to enable bit-robbed

signaling, external framing bit, CRC, or S-bit in-

sertion, and yellow and blue alarm modes. It also

provides for two different idle code formats, and

selection of bipolar or NRZ output. Figure 10

shows an overview of the Transmit Control Reg-

ister.

Transmit Yellow Alarm

TCR.0: TYEL

Setting TYEL (TCR.0) to a "1" causes the

CS62180B to automatically generate

and transmit a yellow alarm in the

appropriate format. In 193S mode the yellow

alarm format used will be determined by the set-

ting of CCR.3. In 193E mode, the yellow alarm

format will be determined by the setting of

CCR.5. See Common Control Register, above,

for description of the available yellow alarm for-

mats for 193S and 193E modes. In SLC-96

mode, the CS62180B does not generate the yel-

low alarm code. rather, the user transmits the

SLC-96

® yellow alarm via the data link. In

T1DM mode, the yellow alarm is transmitted in

bit 5 of channel 24 (and CCR.3 should be set to

a "0"). Clearing TCR.0 disables yellow alarm

transmission.

Transmit Blue Alarm

TCR.1: TBL

Setting TBL (TCR.1) to a "1" generates a blue

alarm; an unframed sequence of all "1’s". If a

framed, all "1’s" signal is required, an FF (hex)

idle code may be output on all channels via ap-

propriate settings of TCR.3 and the TIR registers

(see Transmit Idle Code Select below). Blue

alarm (Alarm Indication Signal, or AIS) over-

rides all other transmission data, and a blue

alarm is automatically output during loopback.

Clearing TCR.1 disables blue alarm transmis-

sion.

193S, SLC-96

® and T1DM S-bit Insertion

TCR.2: 193SI

TCR.2 is applicable to 193S, SLC-96

® and

T1DM modes, but not to the 193E mode.

In the 193S and T1DM modes, setting 193SI

(TCR.2) to a "1" allows the S-bit (all even F-

bits) to be externally supplied via TLINK. When

TCR.2 is clear, the S-bit will be internally gen-

erated.

In the SLC-96

® mode, setting 193SI (TCR.2) to

a "1" allows the S-bit (selected even F-bits) to be

externally supplied via TLINK, and the user

must input all Fs, spoiler and DL bits. When

TCR.2 is clear, the CS62180B generates the

SLC-96

® spoiler bits and Fs bits, and the user

(MSB)

654321

(LSB)

ODF

TFPT

TCP

RBSE

TIS

193SI

TBL

TYEL

Bipolar

Internal

Disabled

7F (Hex)

Internal

Normal

NRZ

External

Enabled

FF (Hex)

External

1 Blue Alarm 1

Yel. Alarm

Figure10. Transmit Control Register (TCR)

CS62180B

DS225PP2

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