ACS-I1024-CPGA Photon Vision Systems, Inc., ACS-I1024-CPGA Datasheet - Page 13

• Manufacturer Part Number: ACS-I1024-CPGA
• Description: High Performance Area CMOS Image Sensor
• Manufacturer: Photon Vision Systems, Inc.

TIMING DIAGRAM: SETUP REGISTER WRITE AND READ
The following timing diagrams illustrate setup register writing and reading. It is important to note that the writing and
reading of the setup registers is asynchronous, that is these operations are not clock dependant.
CAUTION: Do not change the state of N_WR whenever N_CS is low. Register reading and writing can only occur when
the device is in MASTER mode. Note minimum pulse duration is 1 master clock pulse.
Note that a register write cycle will occur on the rising edge of N_CS while N_WR is low. A register read cycle occurs on
the falling edge of N_CS whenever N_WR is high. Data is written to, or read from, the registers, within 50ps of the edge
transition. This simplifies timing of signals to access the registers. You only must have valid address and data on the buses
during a N_CS transition, therefore the timing diagrams below do not show actual times. For simplicity of operation, you
can use the CLK1X as an event, if desired. For example, write the Address and data to the ADD and DATA buses, then
while holding those values, on subsequent clocks, strobe the N_CS and N_WR lines.
WRITE CYCLE: Following shows 3 registers being written to. Apply valid address, 0-15(hex) to address bus lines ADD0-
ADD4, and valid data (12 bits) to the REG_DATA bus, REG_DATA_0 - REG_DATA_11. Note diagram shows setting
N_WR signal low only while N_CS is high.
READ CYCLE: Following shows 3 successive register reads. Apply valid address, 0-15(hex) to address bus lines
ADD0-ADD4. Data will be output to the REG_DATA Bus, REG_DATA_0 - REG_DATA_11 on the high to low
transition of N_CS, and will remain valid until N_CS is taken high again. Note diagram shows setting N_WR signal
high only while N_CS is high.
Minimum tsu – 5ns, Minimum tcs – 5ns, minimum th – 10ns. The maximum time for these signals is that the
summation of all three must be less than one frame time.
Product DATASHEET ACS-I XXX Rev. 10/31/00 Subject to change without notice. Page 13 of 26
tsu
tcs
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Photon Vision Systems, Inc. 1999, 2000
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PRELIMINARY