XRT91L32 查看數據表（PDF） - Exar Corporation

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XRT91L32

STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER

Exar Corporation 

XRT91L32

STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER

RECEIVER SECTION

xr

REV. 1.0.2

NAME

RXDO0

RXDO1

RXDO2

RXDO3

RXDO4

RXDO5

RXDO6

RXDO7

RXIP

RXIN

LEVEL

LVTTL

TYPE

O

Diff LVPECL

I

XRXCLKIP

Diff LVPECL

I

XRXCLKIN

RXPCLKO

LVTTL

O

CDRAUX-

LVTTL

I

REFCLK

OOF

LVTTL

I

FRAMEPULSE

LVTTL

O

PIN

DESCRIPTION

35 Receive Parallel Data Output

36 77.76 Mbps (STS-12/STM-4) / 19.44 Mbps (STS-3/STM-1)

38 8-bit parallel receive data output is updated simultaneously on

39

the rising edge of the RXPCLKO output. The 8-bit parallel inter-

41

face is de-multiplexed from the receive serial data input MSB

first (RXDO[7:0]). The XRT91L30 will output the data on the

42

rising edge of this clock.

44

45

24 Receive Serial Data Input

25 The differential receive serial data stream of 622.08 Mbps

STS-12/STM-1 or 155.52 Mbps STS-3/STM-1 is applied to

these input pins.

19 External Recovered Receive Clock Input

20 The differential receive serial data stream of 622.08 Mbps

STS-12/STM-1 or 155.52 Mbps STS-3/STM-1 is sampled on

the rising edge of this externally recovered differential clock

coming from the optical module. It is used when the internal

CDR unit is disabled and bypassed by the CDRDIS pin.

NOTE: In the event that XRXCLKIP/N differential input pins are

unused, XRXCLKIP should be tied to VCC with a 1k

Ohm pull-up and XRXCLKIN should be tied to Ground

with a 1k Ohm pull-down.

47 Receive Parallel Clock Output (77.76 MHz or 19.44 MHz)

77.76 MHz (STS-12/STM-4) or 19.44 MHz (STS-3/STM-1)

clock output reference for the 8-bit parallel receive data output

RXDO[7:0]. The parallel received data output bus will be

updated on the falling edge of this clock.

51 Clock and Data Recovery Auxillary Reference Clock

77.76 MHz ± 500 ppm auxillary reference clock for the CDR.

NOTE: In the event that CDRAUXREFCLK LVTTL input pin is

unused, CDRAUXREFCLK should be tied to ground.

22 Out of Frame Input Indicator

This level sensitive input pin is used to initiate frame detection

and byte alignment recovery when OOF is declared by the

downstream device. When this pin is held High, FRAME-

PULSE will pulse for a single RXPCLKO period upon the detec-

tion of every third frame alignment A2 byte in the incoming

SONET/SDH Frame.

"Low" = Normal Operation

"High" = OOF Indication initiating frame detection and byte

boundary recovery and activating FRAMEPULSE

48 Sonet Frame Alignment Pulse

This pin will generate a single pulse for an RXPCLKO clock

period upon the detection of the third frame alignment A2 byte

whenever the OOF input pin is held High. The parallel received

data output bus will then be byte aligned to this newly recov-

ered SONET/SDH frame.

8

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