XRT83SL314IB datasheet(32/83 Pages) EXAR

32 / 83 page

XRT83SL314

REV. 1.0.1

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

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

Chip Address A[10:8]

Address A[7:0]

Data [7:0]

CS[4:0]

Master

Slave

XRT83SL314

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