16 device disable register, 17 delay timer control/status register, 17 device disable register - 14 – Kontron VMP3 User Manual
Page 74: Configuration vmp3
Configuration
VMP3
Page 4 - 14
© 2005 Kontron Modular Computers GmbH
ID 29230, Rev. 01
29230
.01.UG.VC.050727/091436
P R E L I M I N A R Y
4.2.16
Device Disable Register
The register provides the capability to disable certain internal functions of the CPU and is
reserved for manufacturing use only.
4.2.17
Delay Timer Control/Status Register
The delay timer provides the capability to realize short, reliable delay times. The delay timer
control/status register provides three functions for operating the delay timer. The first function
is to indicate the timing intervals available, the second function is to trigger/reset the timer, and
the third is to indicate the time elapsed since the initial triggering or the last timer reset.
Writing a 0x00 and then reading the register will provide the timer intervals that are available
for application usage. In the case of the VMP3, all of the possible timer intervals are available.
Writing anything other than 0x00 to the register sets the timer to zero and restarts it, and sets
all of this register’s bits to 0. As time elaspes, interval bits are set accordingly and remain set
until the timer is retriggered.
For example, the timer is started, after 1 µs bit 0 is set to 1, after 5 µs bit 1 is set 1. This process
continues until all bits are set or the timer is retriggered. Once a bit is set it remains set until the
timer is again retriggered.
Table 4-17: Device Disable Register
REGISTER NAME
DEVICE DISABLE REGISTER
ACCESS
ADDRESS
0xFFFF A013
R
BIT POSITION
MSB
7
6
5
4
3
2
1
0
LS
B
CONTENT
res.
res.
res.
res.
DIS_ENCR
res.
res.
DIS_PCI
DEFAULT
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a