XRT94L31IB-L Exar Corporation, XRT94L31IB-L Datasheet - Page 120

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

Specifications of XRT94L31IB-L

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

XRT94L31
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
N
The Transmit Order-wire Byte Overhead Input Port provides a dedicated port for the user to insert his/her own
value for the E1, F1 and E2 bytes within the outbound STS-3/STM-1 data-stream. The user should note that
the TxE1F1E2 input pin is sampled (by the Transmit Order-wire Byte Overhead Input Port) upon the rising
edge of TxTOHClk. All of the remaining signals (e.g., TxE1F1E2Enable, TxE1F1E2Frame) are updated upon
the falling edge of TxTOHClk. The timing wave-form and information for the Transmit Order-wire Byte
Overhead Input Port is presented below.
F
1.7
S
OTE
IGURE
YMBOL
t18
t19
t20
: The values for t18, t19 and t20 can be found in
23. I
TRANSMIT ORDERWIRE (E1, F1, E2) BYTE OVERHEAD INPUT PORT
TxPOHFrame
TxPOHEnable
Falling edge of TxPOHClk to rising edge of TxPOHFrame and TxPOHValid
output delay
TxPOHIns to rising edge of TxPOHClk set-up time
TxPOH Data to rising edge of TxPOHClk set-up time
LLUSTRATION OF
TxPOHClk
TxPOHIns
T
TxPOH
ABLE
24: T
IMING
T
IMING
I
NFORMATION FOR THE
W
AVE
D
ESCRIPTION
-
FORM OF THE
t18
Table 24
t19
120
T
T
RANSMIT
RANSMIT
.
POH O
POH O
t20
VERHEAD
VERHEAD
-0.3ns
M
4ns
4ns
I
NPUT
I
IN
NPUT
.
P
P
ORT
ORT
T
YP
.
REV. 1.0.1
0.2ns
M
AX
.