PEB 2086
1.2.1
Pin Definitions and Functions of PEB 2086
Pin No.
P-MQFP-64 P-LCC-44
Pin No.
Symbol Input (I)
Output (O)
Function
Open
Drain (OD)
37
38
39
40
41
42
43
44
41
42
43
44
1
2
3
4
AD0/D0 I/O
Multiplexed Bus Mode: Address/data bus
transfers addresses from the µP system to
the ISAC-S and data between the µP
system and the ISAC-S.
Non-Multiplexed Bus Mode: Data bus.
Transfers data between the µP system and
the ISAC-S.
AD1/D1 I/O
AD2/D2 I/O
AD3/D3 I/O
AD4/D4 I/O
AD5/D5 I/O
AD6/D6 I/O
AD7/D7 I/O
27
37
CS
I
Chip Select: A “Low“ on this line selects
the ISAC-S for a read/write operation.
28
38
R/W
I
Read/Write: When “High“ identifies a valid
µP access as a read operation. When
“Low“, identifies a valid µP access as a
write operation (Motorola bus mode).
Write: This signal indicates a write
operation (Intel bus mode).
28
29
38
39
WR
DS
I
I
Data Strobe: The rising edge marks the
end of a valid read or write operation
(Motorola bus mode).
29
8
39
23
RD
I
Read: This signal indicates a read
operation (Intel bus mode).
INT
OD
Interrupt Request: The signal is activated
when the ISAC-S requests an interrupt. It is
an open drain output.
26
36
ALE
I
Address Latch Enable: A high on this line
indicates an address on the external
address bus (multiplexed bus type only).
ALE also selects the microprocessor
interface type (multiplexed or non-
multiplexed).
Semiconductor Group
19
INFINEON [ Infineon ]
