SC2000 datasheet(13/44 Pages) PHILIPS

13 / 44 page

2000 Sep 07

Philips Semiconductors

Preliminary speciﬁcation

Universal Timeslot Interchange

SC2000

Time Slot Select (DR_6 .. DR_0): This

7-bit field specifies a time slot number

between 0 and 127. DR_6 is the MSB of

this field.

Port Select (DR_11 .. DR_8): When

SCbus mode is selected (C_4 = 0) this

4-bit field specifies an SCbus data

stream number between 0 and 15.

DR_11 is the MSB of this field.

When a PEB Mode with switching is

selected (C_6, C_4 = 11) this 4- bit field

specifies a PEB data stream. See table for

details.

Destination Routing Memory LSB

Bit

Function

DR_0: Time slot Select 0

DR_1: Time slot Select 1

DR_2: Time slot Select 2

DR_3: Time slot Select 3

DR_4: Time slot Select 4

DR_5: Time slot Select 5

DR_6: Time slot Select 6

DR_7: Reserved

Note:

Bit 0 is the LSB of the Low Byte

Data Register.

Destination Routing Memory MSB

Bit

Function

DR_8: Port Select 0

DR_9: Port Select 1

DR_10: Port Select 2

DR_11: Port Select 3

DR_12: Reserved

DR_13: Reserved

DR_14: Parallel Access Enable

DR_15: Switch Output Enable

Note:

Bit 0 is the LSB of the High Byte

Data Register.

Parallel Access Enable (DR_14): When

this bit is cleared to 0, the SC2000 uses

the local SI bus as the source of data

for the expansion bus. When this bit is

set to 1 the SC2000 uses the contents of

the corresponding Destination Parallel

Access Register as the source of expan-

sion bus data.

Switch Output Enable (DR_15): When

this bit is cleared to 0, the SC2000 ex-

pansion bus drivers are forced to the

high impedance state during the speci-

fied time slot period. When this bit is set

to 1 the SC2000 expansion bus drivers

drive the bus during the specified time

slot period.

Source Routing Memory (A0H - BFH):

The Source Routing Memory maps time

slots from the expansion bus onto time

slots on the local SO bus. Each location

in the Source Routing Memory

corresponds to a time slot on the

local SO bus.

Destination Port Select (PEB Mode)

DR_11..DR_8

PEB Destination

L_SERT/L_TSX*

SERR

R_SERT/R_TSX*

SERT

Reserved

Source Routing Memory

IAR

Source Mapping

A0H

Channel 0

A1H

Channel 1

A2H

Channel 2

BFH

Channel 31

Note:

IAR = Internal Address register contents.

Channel N is equivalent to time slot N

on the local S0 bus.

The contents of all Source Routing

Memory Location are cleared on

RESET.

When writing data into the Source

Routing Memory the Low Byte Data

holding a time slot number, and the

High Data Byte Register contains a 4-bit

binary field holding a Port (stream)

number. Together these two fields

uniquely identify a time slot on the

expansion bus which will be used as a

source of data for a time slot on the local

SO bus.

Time slot Select (SR_6 .. SR_0): This

7-bit field specifies a time slot number

between 0 and 127. SR_6 is the MSB of

this field.

Port Select (SR_11 .. SR_8): When

SCbus Mode is selected (C_4 = 0),

this 4-bit field specifies an SCbus data

stream number between 0 and 15.

SR_11 is the MSB of this field.

When a PEB Mode with switching is

selected (C_6, C_4 = 11) this 4-bit field

specifies a PEB data stream as follows:

Source Routing Memory LSB

Bit

Function

SR_0: Time Slot Select 0

SR_1: Time Slot Select 1

SR_2: Time Slot Select 2

SR_3: Time Slot Select 3

SR_4: Time Slot Select 4

SR_5: Time Slot Select 5

SR_6: Time Slot Select 6

SR_7: Reserved

Note:

Bit 0 is the LSB of the Low Byte

Data Register.

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