Specifications A–11
Publication
17476.6 - July 1996
Variable Variable Description Location of Variable
T
M0
Time to perform M0 file write to enable
BT
appendix B
T
SNo–bt
Scanner Output Delay time with BTs
present. There must be an output delay
time added for each BT buffer that is
being used since the scanner processes
only one BT enable or disable every
T
SNo-bt
(to minimize the impact on
discrete I/O throughput).
➀
see the section Determining
T
SNo-bt
on page A-7
T
btwait
Equals the sum of the throughput times
for all BTs scheduled to the same logical
rack (time waiting is queue), + T
SNo-bt
(time to schedule pending BT). If
multiple BTs are not being performed to
the same logical rack, this value equals
zero.
calculated
T
RIO
RIO scan time without BTs
see the section RIO Scan
Time Calculation (T
RIO
) on
page A-4
T
btx
Amount that the RIO scan time can be
increased due to BTs. This includes the
time for the scanner to initiate the BT
and transfer the data.
see the section Determining
T
btx
on page A-7
T
adp–bt
Time for the adapter to acknowledge the
BT request. For the 1747ASB, the
manual defines this as no more than one
(ASB) backplane scan time and two RIO
scans. However, the two RIO scans are
already included in the above equation
so only the ASB scan time needs to be
added.
adapter user manual
T
ps
One processor scan time may occur
before the SLC control program detects
that the DN flag has been set or cleared
APS reference manual
➀ When calculating BT throughput, one T
SNo-bt
is also required to handle the BT response.
RIO Scanner Output Delay Time (T
SNo
) Tables
The tables provided in this section show the maximum scanner
output delay time (T
SNo
) for specific applications. T
SNo
is
dependent on the following:
• processor scan time, or time between immediate outputs (if no
BTs are present)
• number of logical racks configured
• whether normal or complementary I/O mode is selected
• RIO baud rate (if complementary I/O is selected)
To Next Page
Loading...