VM162/VM172
Chapter 2 Functional Description
Juli 23, 1997
Page 2- 13
© PEP Modular Computers
2.5.5 VME Control/Status Register
The VME Control/Status Register is a one byte wide register with read/write access at default address
CD 00 00 05 (HEX).
Note: All bits except bit 4 (First Slot Detection) are cleared after reset. The firmware of the board initia-
lizes some of them at startup according to the default parameters stored in the EEPROM.
Register Description
Note: All bits are cleared during a reset. FSD is set dependent on the slot position of the board in the
system. The board’s firmware initializes EN_DTR, EN_BERR2 and BADR[3-0] during startup follo-
wing default parameters stored in the serial EEPROM.
Name
Value
Reset (HW)
Slot 1
Other
Reset PEP (SW)
Slot 1
Other
Description
P_IRQ5
bit 7
EN_DPR
bit 6
EN_BERR2
bit 5
FSD
bit 4
BADR3 -
BADR0
bits 3-0
1
1
1
1
0
0
0
0
0
0
1
0
0
0
0
0
Value stored in
EEPROM
1
0
1
0
Value stored in
EEPROM
Pending mailbox IRQ
Dual-port RAM (inc. mailbox IRQ) for
VME requester enabled. Base address
fixed using BADRx bits
Enable bus monitor timer, all VME
cycles, timeout after 128
µ
s
VMEbus ‘First Slot Detection’ flag,
system controller
VME address location of dual-ported
RAM. Equivalent to VME address lines
A23-A20, programmable from $0-$F in
1 MByte windows, enabled with
EN_DPR
BADR2
BADR3
BADR1
BADR0
CS7 + $5
0
1
2
3
4
5
6
7
P_IRQ5
FSD
EN_BERR2
EN_DPR
Summary of Contents for VM162
Page 2: ......
Page 6: ...VM162 VM172 Table of Contents Page TOC 4 PEP Modular Computers Juli 23 1997 ...
Page 7: ...VM162 VM172 Juli 23 1997 Page 0 1 PEP Modular Computers Preface ...
Page 12: ...VM162 VM172 Chapter 1 Introduction Page 1 2 PEP Modular Computers Juli 23 1997 ...
Page 62: ...VM162 VM172 Chapter 3 Configuration Page 3 2 PEP Modular Computers Juli 23 1997 ...
Page 72: ...VM162 VM172 Chapter 4 Programming Page 4 2 PEP Modular Computers July 19 1997 ...
Page 117: ...3 OS 9 System Modem 3 1 15 pin Connector 3 2 8 pin RJ45 Connector SMART I O ...
Page 119: ...4 2 Hardware Handshake 4 2 1 15 pin Connector 4 2 2 8 pin RJ45 Connector SMART I O ...