ASX340 datasheet(34/78 Pages) ETC2

34 / 78 page

PDF: 171981479/Source: 8304342517

Aptina reserves the right to change products or specifications without notice.

ASX340/MT9V139_DS Rev. C Pub. 3/11 EN

ASX340/MT9V139: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor

External Signal Processing

Aptina Confidential and Proprietary

Preliminary

Host Command Interface

Aptina’s sensors and SOCs contain numerous registers that are accessed through a

two-wire interface with speeds up to 400 kHz.

The ASX340/MT9V139 in addition to writing or reading straight to/from registers or

firmware variables, has a mechanism to write higher level commands, the Host

Command Interface (HCI). Once a command has been written through the HCI, it will

be executed by on chip firmware and the results are reported back. In general, registers

shall not be accessed with the exception of registers that are marked for “User Access.”

EEPROM or Flash memory is also available to store commands for later execution.

Under DMA control, a command is written into the SOC and executed.

For a complete spec on host commands, refer to the ASX340/MT9V139 Host Command

Interface Specification.

Figure 20:

Interface Structure

Host Command to FW

Response from FW

bit

command register

Addr 0x40

Addr 0xFC00

Addr 0xFC0E

Addr 0xFC02

Addr 0xFC04

Addr 0xFC06

Addr 0xFC08

Addr 0xFC0A

Addr 0xFC0C

door bell

bit

Parameter 0

Parameter 7

cmd_handler_params_pool_0

cmd_handler_params_pool_1

cmd_handler_params_pool_2

cmd_handler_params_pool_3

cmd_handler_params_pool_4

cmd_handler_params_pool_5

cmd_handler_params_pool_6

cmd_handler_params_pool_7

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