LSI Specification

MB86617A

5.5. Other Pins

This section explains the pin function like internal PLL.

Signal Name

I/O

Function

 

 

 

XRESET

I

Input signal for resetting signal

When operating with cable supply power, set this pin to ‘L’.

 

 

 

 

This pin is used for setting operating mode of MPU.

MODE1

 

This device is operated as follows depending on the setting of MODE1 and MODE0

 

 

pins;

 

I

‘00’ input: TX1940 mode

 

MODE0

 

‘01’ input: MB90F574 mode

 

‘10’ input: 80 system non-multiplex mode

 

 

‘11’ input: 68 system non-multiplex mode

 

 

 

XO

I/O

 

 

 

Exterior type crystal connecting pin for oscillator circuit (24.576MHz)

XI

I

 

 

 

 

RF

O

Connect t o GND through 5.1kΩ register.

FIL

O

Exterior type filter circuit connecting pin for internal PLL

 

 

 

RO

O

Connect to GND through 5.1kΩ register.

 

 

 

CPS

I

Power supply input pin from IEEE1394 cable

Detect cable supply power 0 to 33V (requiring of lowering/dividing voltage)

 

 

 

 

 

PMODE

I

Criterion pin for inputting power

‘L’ input : operate with power supplying through IEEE1394 cable

 

 

‘H’ input: operate with system power

 

 

 

 

 

Setting pin got POWER_CLASS of Self-ID packet to be transmitted when operating

 

 

with supply power through cable.

PWR3 - 1

I

Note) The POWER_CLASS of the Self_ID packet to be sent when operating

 

 

under the system power does not use this pin, but follows the setting of

 

 

Pwr bit (Bit2 to 0) of Physical Register#4.

 

 

 

 

 

Output pin for detecting Link-on packet receive

LINKON

O

Output ‘H’ when receiving Link -on packet under operating with supply power

through IEEE1394 cable. When PMODE becomes ‘H’, ‘L’ is output. With the

 

 

PMODE in ‘H’, the output of this pin is not changed.

 

 

If not using this pin, set this pin as open one.

 

 

 

TEST1 - 7

I/O

This pin is for test. Use this pin as open one.

 

 

 

Rev.1.0

17

Fujitsu VLSI

Page 22
Image 22
Fujitsu MB86617A manual Other Pins, Xreset