pef20320 Infineon Technologies Corporation, pef20320 Datasheet - Page 18

• Manufacturer Part Number: pef20320
• Description: Multichannel Network Interface Controller For Hdlc With 32 Channels
• Manufacturer: Infineon Technologies Corporation

User’s Manual
Pin Definitions and Functions (cont’d)
Pin No.
P-MQFP-160-1
80
66
Symbol
HLDAO
BGO
AR
Output (O)
Input (I)
O
O
I
18
Function
Bus Hold Acknowledge Passing ON
(Intel bus mode)
If another MUNICH32 has initiated a
HOLD REQUEST the HOLD
ACKNOWLEDGE is passed on via
HLDAO. The MUNICH32 does not give
another HOLD REQUEST before the
HOLD ACKNOWLEDGE has been
deactivated in order to prevent blocking in
the case of continuous request by one
MUNICH32.
Bus Grant Acknowledge (Motorola bus
mode)
If the MUNICH32 has not requested the
bus mastership it passes on the BUS
GRANT. The MUNICH32 does not give
another BUS REQUEST before the BUS
REQUEST and the BUS GRANT
ACKNOWLEDGE have been deactivated
in order to prevent blocking in the case of
continuous request by one MUNICH32.
Action Request
AR must be pulsed low to cause an action
of the MUNICH32. The AR is activated for
updating the mode and channel
configurations, setting a test loop, or
initializing the interrupt queue. The
min. time between Reset and first AR is
500 s.
Introduction
PEB 20320
01.2000