Preliminary ?
MT9V032: 1/3-Inch Wide-VGA Digital Image Sensor
Appendix A – Serial Configurations
Broadcast and Individual Writes for Stereoscopic Topology
In stereoscopic mode, the two sensors are required to run in lockstep. This implies that
control logic in each sensor is in exactly the same state as its pair on every clock. To
ensure this, all inputs that affect control logic must be identical and arrive at the same
time at each sensor.
These inputs include:
? system clock
? system reset
? two-wire serial interface clk - SCL
? two-wire serial interface data - SDA
Figure 8:
Two-Wire Serial Interface Configuration in Stereoscopic Mode
L
2 6 . 6 MHz
Os c .
L
L
C LK
S _ C TRL_ADR[0]
S LAVE
S EN S OR
C LK
S _ C TRL_ADR[0]
MA S TER
S EN S OR
C LK
HO S T
SC L
S DA
SC L
S DA
SC L
S DA
Host laun c hes SC L an d S DA on positive
e dg e of S Y SC LK.
All system c lo c k len g ths (L) must b e equal.
SC L an d S DA len g ths to ea c h sensor (from the host) must also b e equal.
The setup in Figure 8 shows how the two sensors can maintain lockstep when their
configuration registers are written through the two-wire serial interface. A WRITE to
configuration registers would either be broadcast (simultaneous WRITES to both
sensors) or individual (WRITE to just one sensor at a time). READs from configuration
registers would be individual (READs from just one sensor at a time).
One of the two serial interface slave address bits of the sensor is hardwired. The other is
controlled by the host. This allows the host to perform either a broadcast or a one-to-
one access.
Broadcast WRITES are performed by setting the same S_CTRL_ADR input bit for both
slave and master sensor. Individual WRITES are performed by setting opposite
S_CTRL_ADR input bit for both slave and master sensor. Similarly, individual READs are
performed by setting opposite S_CTRL_ADR input bit for both slave and master sensor.
PDF: 09005aef824c9998/Source: 09005aef824c999c
MT9V032_LDS_2.fm - Rev. B 3/07 EN
12
Micron Technology, Inc., reserves the right to change products or specifications without notice.
?2006 Micron Technology, Inc. All rights reserved.
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