xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 69

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
AE16
TXHDLCDAT_7_2
STS1TXA_D7_2
TXAISEN_2
I
R
ECEIVE
TTL
S
YSTEM
Transmit STS-1 Telecom Bus – Channel 2 – Input Data
Bus pin number 7:
The exact function of this pin depends upon whether the STS-
1 Telecom Bus Interface, associated with Channel 2 is
enabled or not.
If STS-1 Telecom Bus (Channel 2) has been enabled –
STS-1 Transmit Telecom Bus – Input Data Bus pin number 7:
STS1TXA_D7_2:
This input pin along with “STS1TXA_D_2[6:0]” function as the
“STS-1 Transmit (Add) Telecom Bus – Input Data Bus for
Channel 2. The STS-1 Telecom Bus interface will sample and
latch this pin upon the falling edge of “STS1TXA_CK_2”.
Note:
If STS-1 Telecom Bus (Channel 2) has NOT been enabled:
If STS-1 Telecom Bus (Channel 2) has not been enabled, then
this particular pin can be configured to function in either of the
following roles.
TXHDLCDAT_7_2 (Transmit HDLC block data – Channel 2
– Input data pin 7 – High Speed HDLC Controller Mode
Only)
This input pin will function as a part of the “Transmit HDLC
Controller” byte-wide data input bus, whenever the user
configures the DS3/E3 Framer block (associated with Channel
2) to operate in the “High-Speed HDLC Controller” Mode. This
pin will function as Data Input Pin # 2.
TXAISEN_2 (Transmit AIS Enable – Channel 2)
This input pin permits the user to command the DS3/E3 Frame
Generator block (associated with Channel 2) to transmit the
DS3/E3 AIS indicator. Pulling this input pin “high” configures
the DS3/E3 Frame Generator block to generate and transmit
the DS3/E3 AIS indicator.
configures the DS3/E3 Frame Generator block to transmit
normal DS3/E3 data-streams.
NOTE: The user should pull this pin to “GND” for normal
S
69
IDE
I
NTERFACE
This input pin functions as the MSB (Most Significant
Bit) of the Transmit (Add) Telecom Bus, for Channel
2.
operation
P
INS
Pulling this input pin “low”
XRT94L33
Rev.1.2.0.