XRT86L30
REV. 1.0.1
SINGLE T1/E1/J1 FRAMER/LIU COMBO
TABLE 43: GAPPED
CLOCK
CONTROL
REGISTER
R
EGISTER 30 - T1/E1
UNCTION
G
APPED LOCK ONTROL
C
C
R
EGISTER (GCCR)
HEX ADDRESS: 0X011E
B
IT
F
T
YPE
D
EFAULT
DESCRIPTION-OPERATION
7
FrOutclk
R/W
0
Framer Output Clock Reference
By default, the output clock reference on T1OSCCLK and
E1OSCCLK output pins is 1.544MHz/2.048MHz respectively. By
setting this bit to a “1”, the output clock reference is 49.408MHz/
65.536MHz for T1/E1 respectively.
0 = Standard T1/E1 Rate
1 = High-Speed Rate
[6:2] Reserved
1 TxGCCR
-
-
These bits are reserved
R/W
0
Transmit Gapped Clock Interface
This bit is used to select a gapped clock interface operating at
2.048Mbit/s in DS-1 mode. In this application, 63 gaps (missing
data) are inserted so that the overall bit rate is reduced to 1.544Mbit/
s. (In this mode, TxMSYNC is used as the 2.048MHz Gapped Clock
Input. TxSER is used as the 2.048MHz Gapped Data Input.
TxSERCLK must be 1.544MHz.)
0 = Disabled
1 = Transmit gapped clock for the Transmit Path
0
RxGCCR
R/W
0
Receive Gapped Clock Interface
This bit is used to select a gapped clock interface operating at
2.048Mbit/s in DS-1 mode. In this application, 63 gaps (missing
data) are inserted so that the overall bit rate is reduced to 1.544Mbit/
s. (In this mode, RxSERCLK should be configured as an input so
that a 2.048MHz Gapped Clock can be applied to the Framer block.
RxSER is used as the 2.048MHz Gapped Data Output. The posi-
tion of the gaps will be determined by the gaps placed in RxSER-
CLK by the user.)
0 = Disabled
1 = Receive gapped clock for the Receive Path
T
ABLE 44: GAPPED
C
LOCK
C
ONTROL
R
EGISTER
EX DDRESS: 0X011F
R
EGISTER 31 - T1/E1
MULTIPLEXED ()
H
A
B
IT
F
UNCTION YPE
T
D
EFAULT
DESCRIPTION-OPERATION
7:2 Reserved
R/W
R/W
-
Reserved
1:0 MHSCCR[1:0]
00
Multiplexed High-Speed Channel Control
These bits are used to select which channel (the channel position
can be chosen from 1 of 4 different time slots) within the High-Speed
serial data is to be processed by the framer. The other three chan-
nels will be don’t care bits, since this is a single channel device.
This allows the XRT86L30 to be compatible with High-Speed modes
such as HMVIP/H.100, etc.
00 = Channel 0
01 = Channel 1
10 = Channel 2
11 = Channel 3
62
EXAR [ EXAR CORPORATION ]
