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Fig.2 shows the external interrupt image.

Fig.2 External interrupt image

• nHALT signal is consistent with the existing PBX and performs polling by I/O port.

However, when the SH7020 goes to Sleep Mode at HALT, the SH7020 is enabled for interruption on release nHALT and return
from Sleep Mode.

• The nIRQ[0] interrupt of eSAMSON is set to output and the interrupt output is to the SH7020 (Mainly, DPRAM communication

interrupts).

• The nIRQ[1] interrupt of eSAMSON is masked. (Not used)

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The reference point of the line interface on the BRI14/PRI18 cards is Point S/T (Dose not support U point). and supports Exter-
nal call mode and internal call  mode as operating mode.
During External call mode, the power is supplied from PBX, not from DSU. During internal call mode, PSB21150 (Infineon) is
installed as ISDN basic interface  IC for RI14/PRI18. Refer to figure 1.1  "Line Interface Block" for connection diagram of basic
interface. 
For mode detailed specifications, refer to PSB21150 data sheet.

Figure 2.7 Line Interface Summary.

Fiure 2.5 PSB21150 Block figure summary

Figure 2.8  PSB21150 Characteristics

Item

Contents

Remarks

Interface reference point

S/T point

 

Transmission mode

4 line (TX+/TX-/RX+/TX-)

 

Transmission capacity

144kbps, 2B+D(B=64kbps, D=16kbps)

BRI8:line capacity

Transmission  Line code

AMI Code

 

Power Supply

External call mode: None Internal call mode:+40V power
supply

 Internal call power supply BRI8: 4.5W max/1line,
20W max/entire card

Internal call power supply
method

Phantom power supply Separate line power supply

 

Interface connector

RJ45

Item

Contents

Remarks

Transceiver mode

LT-T (External)/LT-S(Internal)

 

Line Extraction Clock

1.536MHz

 

Dch FIFO

64Byte

×2

TX/RX

Bch FIFO

128Byte

×2 (×2)

TX/RX

PCM highway interface

2.048m (Bch interface only) 

uP-interface

8bit parallel (Intel/Motorola)

Intel mode is used for BRI8

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This card utilizes an 2.048 Mbps local highway and local TSW for the purpose of switching the communications channel (B ch.)
detected from the ISDN main interface by the PSB21150, with the CT bus interface. (eSAMSON internal module)
Figure 2.8 illustrates the B ch. Highway assign and eSAMSON/PSB21150 input/output timing. Refer to the eSAMSON specifica-
tions and PSB21150 databook.

Figure 2.8 Bch highway assign & eSAMSON/PSB21150 input/output timing

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Reset commands to this cards LPR (and devices under control by LPR) normally be accepted unless issued by hardware reset
or software command reset from the MPR routed through the eSAMSON.
This card's internal power reset circuit is for resetting the eSAMSON during power on and live wire connection/disconnection.
However, the LPR can be reset without the MPR for the purpose of debugging and evaluating this card using the following jump-
ers:
Product & System Install : jumper A-B shortDebug & Evaluation : jumper A-C short
BRI4/BRI8 card reset type is illustrated in table 2.11. Reset system diagram is illustrated in figure 2.15.

Table 2.11 Reset type

Reset Type

The way of Reset

Specification

Resting ASIC(eSAMSON)

OR condition of the following Reset

L active

Power on reset

Rest via Reset IC
Reset IC spec
Power Supply voltage : 3.3V
Reset voltage  : 2.9V
Reset delay time : 50msec

Over 10msec

Hard reset via EC bus

Reset by EC_RST

Over 10msec 

Soft reset via EC bus

Disengaged after a set period of time

16cycles after EC_CLK about 2usec

Resetting LPR (SH7020)

Soft reset via EC bus

eSAMSON local reset register control

L active Over 10msec (up to stable
PLL)

Resetting Flash

Soft reset via EC bus

Same as reset via LPR

L active Over 500nsec 

Resetting
BRI_IC(PSB21150)

Soft reset  With CPU: via LPR

eSAMSON port P5[7:0] control

L active 4msec or above