XRT86L30
REV. 1.0.1
SINGLE T1/E1/J1 FRAMER/LIU COMBO
4.13 High-Speed Multiplexed Interface
In addition to the non-multiplexed mode, the framer can interface through the backplane in a high-speed
multiplexed application, either through a bit-muxed or byte-muxed (in HMVIP or H.100) manner. In this mode,
the chip is divided into two multiplexed blocks, four channels per block. For T1, the high speed multiplexed
modes are 12.352Mbps (bit-muxed, TxSYNC is “High” during the F-bit), 16.384Mbps (bit-muxed, TxSYNC is
“High” during the F-bit), 16.384Mbps (HMVIP: byte-muxed, TxSYNC is “High” during the last 2-bits of the
previous frame and the first 2-bits of the current frame), or 16.384Mbps (H.100: byte-muxed, TxSYNC is “High”
during the last bit of the previous frame and the first bit in the current frame). For E1 mode, the only mode that
is not supported is the 12.352Mbps. The only other difference is that the F-bit (for T1 mode) becomes the first
bit of the E1 frame. Figure 25 is a simplified block diagram of transmit bit-muxed application. Figure 26 is a
simplified block diagram of receive bit-muxed application. Although the data is only applied to channel 4 or
channel 0, the TxSERCLK is necessary for all channels so that the transmit line rate is always equal to the T1/
E1 carrier rate.
F
IGURE 25. TRANSMIT HIGH-SPEED BIT MULTIPLEXED BLOCK DIAGRAM
TxSYNC0
Bit Interleaved Multiplexed Mode
0b2 0b1
1b2 1b1
2b2 2b1
3b2 3b1
TTIP/TRing0
TTIP/TRing1
TTIP/TRing2
TTIP/TRing3
0b0
1b0
TxMSYNC0
(16.384MHz)
DMUX
3b2 3b2 2b2 2b2 1b2 1b2 0b2 0b2
TxSER0
3b1 3b1 2b1 2b1 1b1 1b1 0b1 0b1 3b0 3b0 2b0 2b0 1b0 1b0 0b0 0b0
2b0
3b0
TxSERCLK0
(2.048MHz)
TxSERCLK1
(2.048MHz)
TxSERCLK2
(2.048MHz)
TxSERCLK3
(2.048MHz)
F
IGURE 26. RECEIVE
HIGH-SPEED
B
IT
M
ULTIPLEXED
B
LOCK
D
IAGRAM
RxSYNC0
Bit Interleaved Multiplexed Mode
0b0 0b1 0b2
1b0 1b1 1b2
2b0 2b1 2b2
3b0 3b1 3b2
RTIP/RRing0
RTIP/RRing1
RTIP/RRing2
RTIP/RRing3
RxSERCLK0
(16.384MHz)
MUX
0b2
0b1 0 1b1 0
2b1 0 3b1 0
0
1b2
0
2b2 0 3b2 0
RxSER0
0b0
0 3b0
1b0 0 2b0 0 0
RZ Data
RxLineClk0
(2.048MHz)
RxLineClk1
(2.048MHz)
RxLineClk2
(2.048MHz)
RxLineClk3
(2.048MHz)
156
EXAR [ EXAR CORPORATION ]
