XRT86VL34 datasheet(56/156 Pages) EXAR

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XRT86VL34

QUAD T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION

REV. V1.2.0

1-0

RxIMODE[1:0]

R/W

(Continued):(

Receive backplane interface signals include:

RxSERCLK is an input clock at either 12.352MHz or16.384MHz depending on

the selected multiplexed mode.

RxSYNC is an input signal which indicates the multiplexed frame boundary.

The length of RxSYNC depends on the multiplexed mode selected.

RxSER is the high-speed data output

NOTE: In high speed mode, receive data is clocked out on the rising edge of

the 12Mhz or 16MHz clock edge.

TABLE 32: RECEIVE INTERFACE CONTROL REGISTER (RICR)

HEX ADDRESS: 0XN122

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

TABLE 34: RECEIVE INTERFACE SPEED WHEN MULTIPLEXED MODE IS

ENABLED (TXMUXEN = 1)

TXIMODE[1:0]

TRANSMIT INTERFACE SPEED

Bit-Multiplexed Mode at 12.352MHz is Enabled:

Receive backplane interface is taking data from the four

LIU input channels 0 through 3 and bit-multiplexing the

four-channel data into one 12.352MHz serial stream and

output on channel 0 of the Receive Serial Output

(RxSER). The RxSYNC signal pulses “High” during the

framing bit of each DS-1 frame.

Bit-Multiplexed Mode at 16.384MHz is Enabled:

Receive backplane interface is taking data from the four

LIU input channels 0 through 3 and bit-multiplexing the

four-channel data into one 16.384MHz serial stream and

output to channel 0 of the Receive Serial Output

(RxSER). The RxSYNC signal pulses “High” during the

framing bit of each T1 frame.

HMVIP High-Speed Multiplexed Mode Enabled:

Receive backplane interface is taking data from the four

LIU input channels 0 through 3 and byte-multiplexing the

four-channel data into one 16.384MHz serial stream and

output to channel 0 of the Receive Serial Output

(RxSER). The RxSYNC signal pulses “High” during the

last two bits of the previous T1 frame and the first two

bits of the current T1 frame.

H.100 High-Speed Multiplexed Mode Enabled:

Receive backplane interface is taking data from the four

LIU input channels 0 through 3 and byte-multiplexing the

four-channel data into one 16.384MHz serial stream and

output to channel 0 of the Receive Serial Output

(RxSER). The RxSYNC signal pulses “High” during the

last bit of the previous T1 frame and the first bit of the

current T1 frame.

XRT86VL34 Datasheet(PDF) 56 Page - Exar Corporation

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