# ECBbus

(at the network device).
(at the transciever).

96 PIN DIN 41612 FEMALE at the backplane
96 PIN DIN 41612 MALE at the boards.

The ECB-bus was defined in 1984 by the german company KONTRON.

It was defined for the 100x160mm-europa-card and used 2x32 pins of a 3x32-pin-connector (row a and c).
Later the third (middle) row of pins was defined for additional signals used in 16-bit-systems. This extended bus uses all 3x32pins.

## Row a & c (for 8 bit)

Pin | Name | Desciption
a1 + | 5V + | 5 volts dc
a2 D | 5 D | ata line bit 5
a3 | D6 | Data line bit 6
a4 | D3 | Data line bit 3
a5 | D4 | Data line bit 4
a6 | A2 | Address 2
a7 | A4 | Address 4
a8 | A5 | Address 5
a9 | A6 | Address 6
a10 | WAIT/ | CPU wait
a11 | BUSRQ/ | bus request
a12 |  |
a13 |  |
a14 |  |
a15 |  |
a16 |  |
a17 |  |
a18 | A14 | address 14
a19 |  |
a20 | M1/ | first cycle
a21 |  |
a22 |  |
a23 |  |
a24 |  |
a25 |  |
a26 |  |
a27 | IORQ/ | in/out request
a28 | RFSH/ | refresh cycle
a29 | A13 | address 13
a30 | A9 | address 9
a31 | BUSAK/ | bus acknowledge
a32 | GND | signal ground

Pin | Name | Desciption
c1 | +5V | +5 volts dc
c2 | D0 | Data line bit 0
c3 | D7 | Data line bit 7
c4 | D2 | Data line bit 2
c5 | A0 | Address 0
c6 | A3 | Address 3
c7 | A1 | Address 1
c8 | A8 | Address 8
c9 | A7 | Address 7
c10 |  |
c11 | IEI | interrupt enable in
c12 |  |
c13 |  |
c14 | D1 | Data line bit 1
c15 |  |
c16 | IEO | interrupt enable out
c17 | A11 | address 11
c18 | A10 | address 10
c19 |  |
c20 | NMI/ | not maskable interrupt
c21 | INT/ | normal interrupt
c22 | WR/ | write cycle
c23 |  |
c24 | RD/ | read cycle
c25 | HALT/ | cpu stopped
c26 |  |
c27 | A12 | address 12
c28 | A15 | address 15
c29 |  |
c30 | MREQ/ | memory request
c31 | RESET/ | cpu reset
c32 | GND | signal ground

## Row b (additional for 16 bit)

Pin | Name | Desciption
b1 | +5V | +5 volts dc
b2 | A20 | address 20
b3 | A21 | address 21
b4 | A22 | address 22
b5 | A23 | address 23
b6 | D8 | data line bit 8
b7 | D9 | data line bit 9
b8 | D10 | data line bit 10
b9 | D11 | data line bit 11
b10 | D12 | data line bit 12
b11 | D13 | data line bit 13
b12 | D14 | data line bit 14
b13 | D15 | data line bit 15
b14 | IRQ7 | interrupt 7
b15 | IRQ6 | interrupt 6
b16 | IRQ5 | interrupt 5
b17 | IRQ4 | interrupt 4
b18 | IRQ3 | interrupt 3
b19 | IRQ2 | interrupt 2
b20 | IRQ1 | interrupt 1
b21 | IRQ0 | interrupt 0
b22 | IOWR | I/O write
b23 | ?? | ??
b24 | IORC | I/O read
b25 | MRDC | Mem read
b26 | ?? | ??
b27 | MWRC | Mem write
b28 | DS0 | Data Select 0
b29 | DS1 | Data Select 1
b30 | OFF | bus driver tristate
b31 | LOCK | bus driver tristate disabled
b32 | GND | signal ground

DS0 | DS1 | Description
--- | --- | ---
0 | 0 | data transfer 16-bit
0 | 1 | only bit 0-7
1 | 0 | only bit 8-15
1 | 1 | no data transfer

Note: / = Active Low

Contributor: Gerd Wilken

Source:
One issue of the magazine computer-technik (c't) in 1984

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-07