Owner manual

VM162/VM172Chapter 2 Functional Description

Juli 23, 1997 Page 2- 7© PEP Modular Computers

2.4.2 Use of 68EN360 Memory Controller

Beside its main purpose which is to provide communication power to the VM162/VM172 the I/O con-

troller 68EN360 is also used for some system integration function. First of all this is DRAM control and

global memory decoding. Therefore, the 8 CS lines provided by the 68EN360 memory controller are

connected to the different memory types or address areas folllowing the scheme in the following Table.

Table 2.3: 68EN360 CS Line Connection

Note: In order to be compatible with the above conﬁguration, the board initialization described in the

Programming Chapter must be closely adhered to.

2.4.3 Use of 68EN360 Interrupt Controller

The 68EN360 internal interrupt controller is one part of the VM162/VM172 interrupt control logic. The

68360 internal interrupt controller provides programmable interrupt vectors for all internal interrupt re-

quests. For detailled description of these interrupts, please refer to the 68EN360 User’s Manual.

Additionally, some external signals are connected with 68EN360 dedicated interrupt inputs. Signals at

this inputs are processed by the 68EN360 to generate autovectored interrupt on ﬁxed levels to the CPU.

These signal are summarized below:

Table 2.4: External Signal Connection

68360 CS Line Connection

CS0 FLASH

CS1 DRAM

CS2 VMEbus via DMA

CS3 Reserved

CS4 SRAM

CS5 CXC

CS6 RTC

CS7 Board Register

Signal

Generated

Autovector

ABORT/ACFAIL 7

Mailbox 5

SYSFAIL 3

Reserved 2

Reserved 1