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6

The CPU (IC1) is a single chip microcomputer of RISC architecture.
This item describes a memory interface (program & work) and peripheral functions.

Shows a list of the memory (program & work).

List of the memory (program & work) 

The CPU (IC1) has a chip select module as an internal peripheral and 8 chip select terminals are prepared outside. The area of
4Mbyte is assigned to a chip select terminal. (When DRAM is used, there is an exception partly, however it is not mentioned
here.)

Table of Chip Select Terminals

Table of Chip Select Port allocation

Part Name

Size

Purpose

Remarks

4M_Flash

4Mbit (256K x 16)

Program Area

Flash memory is employed for the software downloading by on-board.

4M_SRAM

4Mbit (256K x 16) 

Work Area

 

Terminals

Function used 

Wait Function 

(Numeral is no. of 

clocks.) 

Remarks 

CS Terminals

Individual Output 

(1)

Individual Output 

(2)

nCS0 (area 0)

-

-

nCS0

1+Programable 

or

1+Programable+WAIT
Terminals

Used for Flash memory CS.

nCS1 (area 1)

nCASH (DRAM)

-

nCS1

Read  1/Write  2  or
2+WAIT Terminals

Used for IC2 (ASIC) CS

nCS2 (area 2)

-

-

nCS2

1+Programable 

or

1+Programable+WAIT
Terminals

Used for SRAM CS. Work Area

nCS3 (area 3)

nCASL (DRAM)

-

nCS3

Read  1/Write  2  or
2+WAIT Terminals

CS Reserve

nCS4 (area 4)

PA0 (I/O)

TIOCA0 (Timer)

nCS4

Read  1/Write  2  or
2+WAIT Terminals

CS Reserve

nCS5 (area 5)

PA1 (I/O)

nRAS (DRAM)

nCS5

Read  1/Write  2  or
2+WAIT Terminals

CS Reserve

nCS6 (area 6)

PA2 (I/O)

TIOCB0 (Timer)

nCS6

1+Programable 

or

1+Programable+WAIT
Terminals

Used for peripheral LSI CS.

nCS7 (area 7)

PA3 (I/O)

nWAIT

nWAIT

Read  1/Write  2  or
2+WAIT Terminals

Used for Input Wait Terminals.

Chip Select

Address

DeviceBit Wide

Assignment 

Device

Bus Cycle

Remarks

nCS0

0000000h
l
0FFFFFFh

16bit

4M_Flash

IC5

2 Clock (1+Long Wait1)

Port allocation of word by static bus siz-
ingBus cycle has same setting as Area 2
(nCS2).

nCS1

1000000h
l
1FFFFFFh

8bit

ASIC

IC2

2+WAIT Terminals

Port allocation of byte by static bus sizing. 

nCS2

A000000h
l
AFFFFFFh

16bit

4M_SRAM

IC3

2 Clock (1+Long Wait1)

Port allocation of word by static bus siz-
ingBus cycle has same setting as Area 0
(nCS0).

nCS6

6000000h
l
6FFFFFFh

8bit

PRI_IC

IC301

3 Clock (1+Long Wait2)

Port allocation of byte by static bus sizing.

7

Shows the external interrupt image.

External interrupt image

• nHALT signal polls using I/O port to achieve the consistency with the existing PBX.

However, in case the CPU(IC1) moves to the sleep mode while the system is halted, the unit returns from the sleep mode receiv-
ing the interrupt signal in CPU(IC1) when nHALT is released in accordance with its specification. 

• The nIRQ[0] interrupt of ASIC(IC2) should be set to the output, which is used as an interrupt output to the CPU (IC1); mainly

DPRAM communication interrupt. 
The LOS signal of PRI-IC(IC301) is the level output which goes to "H" when the line reference is lost.
Consequently, inputting the inverted LOS signal to the CPU (IC1) enables to generate a negative edge interrupt while the line ref-
erence is lost.
Also setting nIRQ4 terminal of CPU(IC1) to I/O port makes polling possible.
The unit is provided with interrupt processing in order to achieve the consistency with the existing PBX.
Polling with I/O port is disable because nRxMF signal of PRI-IC(IC301) is generated in a periodical frame timing.

• The unit should be kept open with a jumper unpopulated to avoid conflicting between output of nIRQ[0] of ASIC(IC2) and the sig-

nal.

8

The reference point of the line interface on the PRI30 card is Point S/T (Point U is not supported.) and the external and internal
line modes are supported as operating mode.
Also, the PRI23/PRI30 cards employ the PRI-IC (IC301) as the IC for Interface. See the "Line Interface Block" or the outline of
the interface connection. Shows the characteristics of the PRI-IC.
See the PRI-IC data sheet for detailed specifications.

Characteristics of the PRI-IC

This card has a relay for loopback test on the primary side of the line to cut and divide into the line failure or the PBX's own fail-
ure, when there is a defect in operation.
Shows The outline diagram of the line interface loopback.

Outline diagram of the line interface

Item

Contents

Remarks

Line Extraction Clock

2.048MHz/PRI30

 

DPLL

Low Jitter DPLL for clk generation (IC302)

 

Elastic Buffer

Two-frame elastic buffer (Rx & Tx)

 

Signaling Controller

• HDLC Controller 
• CAS Controller
• Multiframe synchronization and synthesis ITU-T G.732 etc.

 

FIFO

64Byte x 2     128Byte x 3

 

PCM Highway Interface

2.048Mbps highway Interface

 

µP-Interface

8bit parallel Bus (Intel/Motorola)

Used Intel Mode for PRI30 Card.

9

This card has the local highway at 2.048Mbps rate and local TSW in order to switch the talk channel (Bch), which is extracted
from ISDN primary rate by PRI-IC (IC301), to H.100 interface. (ASIC (IC2) internal module)
Also, the highway assignment is different for that the number of Bch differs in 2.048M system and 1.544M system. Shows the
highway timing.
For more information, see the ASIC (IC2) specification and PRI-IC (IC301) databook.

Highway timing