
PRELIMINARY
XRT86SH328
55
REV. P1.0.6
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
N
OTE
:
This register bit is only active if the XRT86SH328 has been configured to VT/TU map T1/E1 data into
SONET/SDH.
BIT 7 - Set Telecom Bus to STS-1/STS-3 Mode
This READ/WRITE bit-field is used to configure the STS-1/STS-3 Telecom Bus Interface to operate at either the STS-
1/STS-3 or STS-3 rates.
`
0 - Configures the Telecom Bus Interface to operate at the STS-3/STS-3 rate.
In this case, the Telecom Bus Interface will operate at a rate of 19.44MHz.
`
1 - Configures the Telecom Bus Interface to operate at the STS-1/STS-3 rate. In this case, the Telecom Bus Interface
will operate with a clock rate of 6.48MHz.
N
OTE
:
This bit-field is only active if the XRT86SH328 has been configured to transmit/receive data (on the high-speed
side) via the Telecom Bus Interface.
BIT 6 - Fractional Bandwidth Enable
If the XRT86SH328 is configured to transmit/receive data via the Telecom Bus Interface as STS-3/STS-1/STS-3 rates,
then this READ/WRITE bit-field is used to configure the XRT86SH328 to operate in the Fractional Bandwidth Mode.
If the user configures the XRT86SH328 to operate in the Fractional Bandwidth Mode, then it will only fill in the STS-
1/STS-3 time-slot data (within this outbound STS-3/STS-1/STS-3 data-stream) that pertains to this particular
XRT86SH328. The XRT86SH328 will tri-state the Transmit STS-1/STS-3 Telecom bus interface coincident to
whenever the other STS-1/STS-3 time-slot data would ordinarily be output via the STS-3/STS-1/STS-3 Telecom Bus
Interface.
If the user configures the XRT86SH328 to NOT operate in the Fractional Bandwidth Mode, then it will fill in the STS-
1/STS-3 time-slot data (within this outbound STS-3/STS-1/STS-3 data-stream) that pertains to this particular
XRT86SH328. The XRT86SH328 will automatically set the bytes (within all of the remaining STS-1/STS-3 time-slots)
to 0x00 as it outputs this STS-3/STS-1/STS-3 data-stream via the Transmit STS-3/STS-1/STS-3 Telecom Bus Interface.
`
0 - Configures the XRT86SH328 to NOT operate in the Fractional Bandwidth Mode.
`
1 - Configures the XRT86SH328 to operate in the Fractional Bandwidth Mode.
N
OTES
:
1.
To design in three (3) XRT86SH328s (into the users system) such that they are sharing the same STS-
3/STS-1/STS-3 Telecom Bus, then the user must set this bit-field to 1.
2.
This bit-field is only active if the Telecom Bus Interface has been configured to operate in the STS-
3/STS-1/STS-3 Mode.
BIT 5 - Slot 0 Master Designate
This READ/WRITE bit-field is used to designate a given XRT86SH328 as being the Slot Master. If the user designates
a given XRT86SH328 has being the Slot Master, then this device will be responsible for sourcing the B1 byte, the REI-
L and RDI-L indicators (within the outbound STS-3/STS-1/STS-3 data-stream). Additionally, if a given XRT86SH328
has been designated as the Slot Master, then it will be responsible for generating an 8kHz signal via its
TxSBFP_IN_OUT input/output pin.
If a given XRT86SH328 is NOT configured to function as the Slot Master, then its TxSBFP_IN_OUT input/output pin
will function as an input pin.
`
0 - Configures this particular XRT86SH328 to NOT be the Slot Master.
T
ABLE
43: STS-3/STS-1/STS-3 T
ELECOM
B
US
C
ONTROL
R
EGISTER
- B
YTE
1 (A
DDRESS
= 0
X
0036)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Set Telecom
Bus to
STS-1/STS-
3 Mode
Fractional
Bandwidth
Enable
Slot_0
Master
Slot[1:0]
Telecom Bus
Parity
Include
V1 Signal
Framing
Pulse
Enable
Telecom
Bus - V1
Signa
Support
Enable
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0