XRT94L31IB Exar Corporation, XRT94L31IB Datasheet - Page 125

• Manufacturer Part Number: XRT94L31IB
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L31IB

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Product: Mapper
• Lead Free Status / RoHS Status: Contains lead / RoHS Compliant

REV. 1.0.1
N
The Receive Order-wire Byte Overhead output port provides a dedicated port for the user to extract out the
Order-wire (e.g., the E1, F1 and E2) bytes from that within the incoming STS-3/STM-1 data-stream. The user
should note that all of the output signals (of this port) are updated upon the falling edge of RxTOHClk. The
timing wave-form and information for the Receive Order-wire Byte Overhead output port is presented below.
F
1.12
S
OTE
IGURE
YMBOL
t29
t30
: The values for t29 and t30 can be found in
28. I
RECEIVE ORDERWIRE (E1, F1, E2) BYTES OVERHEAD OUTPUT PORT
RxPOHFrame
RxPOHValid
Falling edge of RxPOHClk to rising edge of RxPOHFrame and RxPOHValid
Falling edge of RxPOHClk to RxPOH output delay
LLUSTRATION OF THE
RxPOHClk
T
ABLE
RxPOH
29: T
IMING
I
T
NFORMATION FOR THE
IMING
D
ESCRIPTION
W
AVE
t29
Table 29
-
FORM OF THE
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
t30
125
.
R
ECEIVE
R
ECEIVE
POH O
POH O
VERHEAD
VERHEAD
-0.3ns
-0.3ns
O
M
UTPUT
IN
.
O
UTPUT
P
ORT
T
YP
XRT94L31
P
.
ORT
M
0ns
0ns
AX
.