48 CR11*, CP11*, CT11* 6U CompactPCI® SBC
Publication No. HRMCR11 Rev. B.0
R.eal T
i
me Clock
The counte
r/
t
imer
s
are progranuned by I/0 accesse
s
.
A single control word
register controls the operation of all three co
u
nter
s
.
For more information on
programming and a detailed register description see the 8254 data sheet.
The RTC is a low-power clock that provide
s
a time-of day clock and a JOO-year
calendar with alam1 features and battery backed opera
t
ion
.
The time-of-day
function indudes 14 control registers. Other features include maskable interrupt
sources and 242 bytes of general purpose CMOS RAM used by system
B
IOS
.
Valid RAM data and time can be maintained after power down through the use
of an external battery
s
ource
.
The R TC is software compatible to the Dallas
DS1287, Motorola MC146818 and the Freescale equivalent.
EIOE and SATA Interfaces
use
Interface
The CRl I offers various IDE/ATAPI and SATA interfa
c
es
.
There are two SATA channels available which are routed to the baclqilane
.
They can transfer up to 150 Mbytes/s.
The signals of the prima
ry
parallel EIDE interface are available at the
baclqilane IO cow1ector o
n
ly
.
TI1e signals of the secondary EIDE interface are
used for cow1ectio11 of a 2.5" HDD or flash disk via cow1ector Pl800 on board
.
The CRl I Syste
m
BIOS automatically detects cow1ected EI
D
E
/
SATA HDDs
or flash disks and enters the corresponding drive parameters into the BIOS
setup
.
Thi
s
fe.ature allows faster and easier handling of varying types of EIDE
hard d
i
sks
.
At the prin1ary EIDE interface two hard disks can be cow1ec
t
ed
.
ht
this case one HOD must be confi
gu
red as master and the other one as slave.
Read the hard disk manual to find out where these
j
u
mpers are located on your
dr
i
ve
.
The optional 2
.
5
"
onboard disk is co
i
mected to an onboard EIDE
coimector (secondary EIDE interface
)
.
Using EIDE and SCSI devices: The PC allows the sinmltaneous use of EIDE,
SATA and SCSI hard dis
k
s
.
BIOS setup allows reordering drives to boot from
either SCSI or EIDE/SAT A drives
.
Please note:
For correct operation of the parallel EIDE interface, a maximlllll cable length of
12 inches
(30
cm
)
must not be exceeded. For use with fast transfer rates such as
UDMA 66 and higher a high density 80 pole cable must be
u
sed
.
TI1e use of
round wired cables is not
r
ecommended
.
For correct operation of the serial SA TA interfaces, a maximum cable length of
100 cm m
u
st not be exceeded
.
The CRl I has four USB 2. 0 chaw1el
s
.
They are bacl-ward compatible to USB
1
.
0
/
1
.
1
.
The USB host controller supports legacy Ke
yb
oar
d/M
ou
s
e usage with
USB-based keyboard and mouse w
it
ho
u
t using additional software driver
s
.
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