PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 19

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

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