Vitc Generator (5235-31 To 5235-33); Figure 4-5: Keyboard Scan Codes - evertz 5010 SIE Instruction Manual

TECHNICAL DESCRIPTION
The status LED's are controlled by interface driver U3.
accessed with a serial clock and data stream once per frame. When all the
LED information has been shifted into the driver, it is latched there by the
LEDSTB signal from the MCU (display header pin 10).
LED diagnostics can be invoked by holding down any key on power up.
When any key is pressed, all the front panel LED's should come on. To
exit LED test mode, remove and re-apply power to the unit.
The 10 pushbuttons are arranged in a 8 x 2 matrix. Data from 8 keys at a
time is latched into U2 by signal SH/LD on U2 pin 1. Address decoder U1
selects which set of 8 switches is latched into U2 using enable lines A0 and
A1. Each time a key is pressed, the MCU firmware generates a key scan
code corresponding to the position of the key in the key matrix.
Keyboard diagnostics can be invoked by pressing any key during power
up. The front panel display will show the message SCAN CODE and the
keyboard scan code. When no keys are depressed, the key scan code is
??. Pressing a key will show the corresponding key scan codes, as shown
in the table below. To exit the keyboard test, remove and re-apply power
to the unit.
Key
SHIFT
VCG ON/OFF
SELECT
!
#

Figure 4-5: Keyboard Scan Codes

4.3.3. VITC Generator (5235-31 to 5235-33)

The 5235 video keyer submodule contains the VITC generator circuitry.
Video in and out come directly from connectors mounted on the rear panel
sub-panel. The MCU address and data bus are fed up the header from the
main board. The majority of the logic for the VITC generator functions is
contained in a programmable logic device (LCA) U8. Its program is loaded
from EPROM U9 on power up
The VITC bit rate is generated by a crystal controlled oscillator consisting
of XT1 and U14a, and associated components. The oscillator output is
buffered by U14c and may be measured at the DCLK test point. The
frequency of 14.425 MHz is 8 times the VITC bit rate. The VITC oscillator
is divided by 8 in the LCA to generator the correct VITC bit rate.
Model 5010-SIE Source ID Encoder Manual
Scan Code Key
41 DISPLAY
02 VCG WINDOW
45 SETUP
"
46
$
06
This driver is
Scan Code
01
42
47
05
07
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