SDA9361 Datasheet, PDF (18/47 Pages) Siemens Semiconductor Group – DDC-PLUS-Deflection Controller

SDA 9361
a) The effective range for Vertical Blanking Time:
16 ... 127 (absolute value)
if STE = 0
0 ... 127 (offset value)
if STE = 1.
b) The "default value if disabled" for Vertical Blanking Time:
21 (absolute value)if STE = 0
8 (offset value)if STE = 1.
c) The effective range for Start Vertical Scan:
2 ... 127 (absolute value)
-128 ... 127 (offset value)
if STE = 0
if STE = 1 and NSA = 1
if STE = 1 and NSA = 0.
d) The effective range for Vertical Scan (total width: 10 Bit): 160 ... 684 lines.
e) The "default value if disabled" for Vertical Scan equals the number of lines of the
source signal reduced by the control value for Start Vertical Scan. (E.g.: input signal:
262 lines per field; Start vertical scan = 8 lines; then (if SSE = 1, STE = 0) vertical
scan = 262 - 8 = 254 lines.
At power on the RAM containing the control items is cleared. Therefore all data are zero
by default (if not otherwise defined) before transferring individual values via Ι²C Bus.
Allowed values out of the effective range are limited, e. g. Vertical blanking time = 3 is
limited to 16 if STE = 0 (that means a minimum of 16 lines is blanked).
There are five bits (SRSE, BSE, SSE, STE, GBE) in the deflection control byte 1 for
disabling some control items. If one of these bits is "0", the value of the corresponding
control item will be ignored and replaced by the value "default value if disabled" in the
table above.
2.5.4 Detailed Description
The Deflection Control Byte 0 includes the following bits:
VOFF STDBY 2FH
BD
RABL VR1
VR0
HDE
VOFF:
Vertical off
0: normal vertical output due to control items
1: vertical saw-tooth is switched off,
vertical protection is disabled
Default value depends on pin 44 (VOFFD)
VOFFD = Low: 0
VOFFD = High: 1
Semiconductor Group
18
1998-02-01