PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 12

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

1.1.1
Pin No.
P-DIP-40
37
38
39
40
1
2
3
4
34
35
36
20
33
Semiconductor Group
Pin Definitions and Functions of PEB 2085
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
Function
Multiplexed Bus Mode: Address/data bus
transfers addresses from the P system to the
ISAC-S and data between the P system and
the ISAC-S.
Non-Multiplexed
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 P
access as a read operation. When "Low",
identifies a valid P access as a 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: This signal indicates a 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 indi-
cates an address on the external address bus
(multiplexed bus type only).
ALE also selects the microprocessor interface
type (multiplexed or non-multiplexed)
P-LCC only.
12
Bus
Mode:
PEB 2085
Data
bus.