CS62180 datasheet(17/50 Pages) CIRRUS

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inputs all other DL bits on TLINK using

TLCLK.

Note: When using internal S-bit generation

(TCR.2 = 0) in conjunction with external FT bit

insertion (TCR.6 = 1), the CS62180B

will logically ’OR’ the value at TSER

with the internally generated value. This means

that the data on TSER during S-bit periods

should always be "0" to avoid corrupting the

generated FS pattern.

Transmit Idle Code Select

TCR.3: TIS

Individual DS0 channels can be replaced with

idle codes by setting the corresponding bits in

the Transmit Idle Registers (TIR1 - TIR3) de-

scribed below. TIS (TCR.3) selects which of two

codes to use. A "0" in TCR.3 will cause a 7F

(hex) to be inserted into the channels specified in

the TIR. Setting TCR.3 to a "1" will select an FF

(hex) code. By asserting all 24 channels idle in

the TIR, this setting can be used to generate a

"framed" blue alarm. Whichever mode is se-

lected, bit-robbed signaling will still effect idle

channels unless they are programmed clear (see

Transmit Transparent Registers, below).

Robbed Bit Signaling Enable

TCR.4: RBSE

A "0" in RBSE (TCR.4) will disable bit-robbed

signaling. Setting TCR.4 to a "1" will enable sig-

naling in all channels. In this mode, data on

TABCD is inserted into the LSB of all DS0

channels during signaling frames. For mixed

voice and data transmission, individual DS0

channels can be programmed clear by setting the

corresponding bits in the Transmit Transparent

Registers (TTR1 - TTR3) described below.

CRC Pass-through

TCR.5: TCP

In 193E framing mode, the CRC bits (F-bit of

frames 2, 6, 10, 14, 18, and 22) may be either

generated internally, or supplied by the user.

Clearing TCP (TCR.5) causes the CS62180B

to generate and insert the CRC bits

automatically. If TCR.5 is set to a "1", data

for the CRC channel may be externally supplied.

When using this mode, CRC bits are sampled

from TSER, and must be externally multiplexed

into the DS0 channel data at the F-bit times of

CRC frames.

FT/FPS Pass Through

TCR.6: TFPT

When TFPT (TCR.6) is clear, the framing bits

for 193S, T1DM and SLC-96

® (FT), or 193E

(FPS) are generated internally and automatically

inserted into the outgoing data stream. Setting

TCR.6 to a "1" allows the framing bits to be ex-

ternally provided. When using this mode,

framing bits are sampled from TSER, and must

be externally multiplexed into the DS0 channel

data at the F-bit times of the appropriate frames.

See note under TCR.2, above.

Output Data Format

TCR.7: ODF

ODF (TCR.7) allows the format of the output

data at TPOS/TNEG to be set to either dual-

unipolar or NRZ format. Clearing TCR.7 selects

for dual-unipolar format on TPOS/TNEG. Set-

ting TCR.7 to a "1" causes data to be output on

TPOS in NRZ format, and TNEG is held low.

When operating in hardware mode, output de-

faults to the dual-unipolar format. TPOS and

TNEG may not be tied together, so an external

OR gate is recommended if NRZ is required

while in hardware mode.

CS62180B

DS225PP2

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