XRT83SL314IB View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83SL314IB' PDF : 83 Pages View PDF
XRT83SL314
REV. 1.0.1
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14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
3.2 84-Channel T1/E1 Multiplexer/Mapper Applications
The XRT83SL314 has the capability of providing the necessary chip selects for multiple 14-channel LIU
devices. The LIU is responsible for selecting itself, up to 5 additional LIU devices, or all 6 devices
simultaneously for permitting access to internal registers. The state of the chip select output pins is
determined by a chip select decoder controlled by the 3 MSBs of the address bus ADDR[10:8]. Only one LIU
(Master) requires the ADDR[10:8]. The other 5 LIU devices use the 8 LSBs for the direct address bus
ADDR[7:0]. Figure 23 is a simplified block diagram of connecting six 14-channel LIU devices for 84-channel
applications. Selection of the chip select outputs using ADDR[10:8] is shown in Table 7.
FIGURE 23. SIMPLIFIED BLOCK DIAGRAM OF AN 84-CHANNEL APPLICATION
Master
CS[4:0]
XRT83SL314
1
CS
Slave
XRT83SL314
2
CS
Slave
XRT83SL314
3
CS
Slave
XRT83SL314
4
CS
Slave
XRT83SL314
5
CS
Slave
XRT83SL314
6
Data [7:0]
Address A[7:0]
Chip Address A[10:8]
TABLE 7: CHIP SELECT ASSIGNMENTS
ADDR[10:8]
ACTIVE CHIP SELECT
0h (000)
Current Device (Master)
1h (001)
Chip 1
2h (010)
Chip 2
3h (011)
Chip 3
4h (100)
Chip 4
5h (101)
Chip 5
6h (110)
Reserved
7h (111)
All Devices Active
29
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