PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 161

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

The microprocessor interface signals are summarized in table 11.
Table 11
Pin No.
P-DIP-40
37
38
39
40
1
2
3
4
34
35
36
20
33
Semiconductor Group
P Interface of the ISAC
Pin No.
P-LCC-44
41
42
43
44
1
2
3
4
37
38
38
39
39
23
36
40
6
5
18
17
10
Pin No.
P-MQFP-64
37
38
39
40
41
42
43
44
27
28
28
29
29
8
26
30
51
50
64
63
55
®
-S
A2
Symbol
AD0/D0
AD1/D1
AD2/D2
AD3/D3
AD4/D4
AD5/D5
AD6/D6
AD7/D7
CS
DS
RD
INT
ALE
A0
A1
A3
A4
A5
R/W
WR
OD
I
I
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
I
I
I
I
I
161
Function
Multiplexed Bus Mode: Address/Data
bus. Transfers addresses from the
system to the ISAC-S and data between
the P system and the ISAC-S.
Non-Multiplexed Bus Mode: Data bus.
Transfers data between the P system and
the ISAC-S.
Chip Select. A 0 ("low") on this line selects
the ISAC-S for a read/write operation.
Read/Write. A 1 ("high"), identifies a valid
identifies a valid
operation (Motorola bus mode).
Write. This signal indicates a write
operation (Siemens/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 (Siemens/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
(multiplexed or non-multiplexed).
Address Bit 0 (Non-multiplexed bus type).
Address Bit 1 (Non-multiplexed bus type).
Address Bit 2 (Non-multiplexed bus type).
Address Bit 3 (Non-multiplexed bus type).
Address Bit 4 (Non-multiplexed bus type).
Address Bit 5 (Non-multiplexed bus type).
P access as a read operation. A 0,
Operational Description
P access as a write
P interface type
P