SC4000 datasheet(12/52 Pages) PHILIPS

12 / 52 page

2000 Sep 07

Philips Semiconductors

Preliminary speciﬁcation

Universal Timeslot Interchange

SC4000

DEVICE OVERVIEW

The SC4000 Universal Timeslot Inter-

change is designed to provide the hard-

ware interface to the SCbus. Its primary

function is exchanging digital data be-

tween the Local bus serial port and the

SCbus serial port. A microprocessor

interface allows the host controller to

specify the timeslots and serial lines for

this exchange. Both the SCbus and the

Local bus can be programmed to oper-

ate at either 2.048 Mb/s, 4.096 Mb/s or

8.192 Mb/s.

As shown in Figure 1 , the destination

routing memory defines the Local Bus to

SCbus switch connection. There are 128

destination routing memory locations

— one for each Local Bus input channel.

The data stored in the destination rout-

ing memory selects the timeslot and

SCbus serial port connection for the

Local Bus input channel. The source

routing memory defines the SCbus to

Local Bus switch connection. There are

128 source routing memory locations —

one for each Local Bus output channel.

The data stored in the source routing

memory selects the time slot and SCbus

serial port connection for the Local Bus

output channel.

Local Bus Channels to Serial Ports SI and SO Time Slot Assignments

Framing mode

SI_0 and SO_0

SI_1 and SO_1

SI_2 and SO_2

SI_3 and SO_3

2.048 Mb/s

ch[0:31] -> ts[0:31]

ch[32:63] -> ts[0:31]

ch[64:95] -> ts[0:31]

ch[96:127] -> ts[0:31]

4.096Mb/s

ch[0:63] -> ts[0:63]

ch[64:127] -> ts[0:63]

8.192 Mb/s

ch[0:127] -> ts[0:127]

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