XRT94L31IB-L Exar Corporation, XRT94L31IB-L Datasheet - Page 119

• 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

REV. 1.0.1
N
The Transmit POH Overhead Input Port is used to insert the users own value for the POH bytes into either the
outbound STS-1 SPE data-stream (which is output via the Transmit STS-3/STM-1 data-stream or via the
outbound STS-1 SPE data-stream (which is output via the Transmit STS-1 data-stream).
N
The timing wave-form and information for the Transmit POH Overhead Input Port is presented below.
F
1.6
S
OTE
OTE
IGURE
YMBOL
t15
t16
t17
: The values for t15, t16 and t17 can be found in
: The TxPOHIns and the TxPOH input pins are sampled (by the Transmit POH Overhead Input Port) upon the rising
edge of TxPOHClk. All of the remaining signals (e.g., TxPOHFrame and TxPOHEnable) are updated upon the
falling edge of TxPOHClk.
22. I
TRANSMIT POH OVERHEAD INPUT PORT
TxTOHFrame
TxTOHEnable
Falling edge of TxTOHClk to rising edge of TxTOHFrame and TxTOHEn-
able output delay
TxTOHIns to rising edge of TxTOHClk set-up time
TxTOH Data to rising edge of TxTOHClk set-up time
LLUSTRATION OF
TxTOHClk
TxTOHIns
T
TxTOH
ABLE
23: T
IMING
T
IMING
I
NFORMATION FOR THE
W
D
AVE
ESCRIPTION
-
FORM OF THE
t15
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
Table 23
t16
119
T
T
RANSMIT
RANSMIT
.
TOH O
TOH O
t17
VERHEAD
VERHEAD
-0.5ns
M
4ns
4ns
I
I
NPUT
IN
NPUT
.
P
P
ORT
ORT
T
YP
XRT94L31
.
0.6ns
M
AX
.