XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 31

• Manufacturer Part Number: XRT94L33IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L33IB-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
PIN DESCRIPTION OF THE XRT94L31 (REV. B)
PIN #
AB16
E12
E17
SIGNAL NAME
TxOH_0
TxOH_1
TxOH_2
I/O
I
TTL
TYPE
Continued
If the user is inserting both POH and TOH data via these input pins:
In this mode, the external circuitry (which is being interfaced to the
Transmit Path Overhead Input Port is suppose to monitor the following
output pins.
•
•
•
The TxOHFrame_n output pin will toggle "High" twice during a given
STS-1 frame period. First, this output pin will toggle "High" coincident
with the TxOH port being ready to accept and process the A1 byte (e.g.,
the very first TOH byte). Second, this output pin will toggle "High" coinci-
dent with the TxOH port being ready to accept and process the J1 byte
(e.g., the very first POH byte).
If the externally circuitry samples the TxOHFrame_n output pin "High",
and the TxOHEnable_n output pin "Low", then the TxOH port is now
ready to accept and process the very first TOH byte.
If the externally circuitry samples the TxOHFrame_n output pin "High"
and the TxOHEnable_n output pin "High", then the TxOH port is now
ready to accept and process the very first POH byte.
To externally insert a given POH or TOH byte;
This data bit will be sampled upon the very next falling edge of
TxOHClk_n. The external circuitry should continue to keep the
TxOHIns_n input pin "High" and advancing the next bits (within the POH
bytes) upon each rising edge of TxOHClk_n.
TxOHFrame_n
TxOHEnable_n
TxOHClk_n
a. assert the TxOHIns_n input pin by toggling it "High", and
b. place the value of the first bit (within this particular POH or TOH
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
byte) on this input upon the very next falling edge of TxOHClk_n
31
DESCRIPTION
XRT94L31