SCCB Master

Project maintainers

Dalmasso, Loïc

Details

Name: scab-master
Created: Oct 21, 2024
Updated: Oct 22, 2024
SVN Updated: Oct 23, 2024
SVN: Browse
Latest version: download (might take a bit to start...)
Statistics: View
Bugs: 0 reported / 0 solved

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Other project properties

Category:Communication controller
Language:VHDL
Development status:Stable
Additional info:
WishBone compliant: No
WishBone version: n/a
License: LGPL

Serial Camera Control Bus (SCCB) Master Controller (for OV7670 Camera Module)

This module implements the OmniVision Serial Camera Control Bus (SCCB) protocol used by the OV7670 Camera. This module supports:

Write Mode (3-Phase Write Transmission)
Read Mode (2-Phase Write Transmission, then 2-Phase Read Transmission)

/!\ Require Pull-Up on SCL and SDA pins /!\

Usage

Set the inputs (mode, Slave address, register address, register value) (keep unchanged until Ready signal is de-asserted)
Asserts Start input (available only when the SCCB Master is Ready).
SCCB Master de-asserts the Ready signal
SCCB Master re-asserts ths Ready signal at the end of transmission (the master is ready for a new transmission)
In Read mode only, the read value is available when its validity signal is asserted

Pin Description

Generics

Name		Description
input_clock		Module Input Clock Frequency
sccb_clock		SCCB Serial Clock Frequency

Ports

Name	Type	Description
i_clock	Input	Module Input Clock
i_mode	Input	Read or Write Mode ('0': Write, '1': Read)
i_slave_addr	Input	Address of the SCCB Slave (7 bits)
i_reg_addr	Input	Address of the Register to Read/Write
i_reg_value	Input	Value of the Register to Write
i_start	Input	Start SCCB Transmission ('0': No Start, '1': Start)
o_ready	Output	Ready State of SCCB Master ('0': Not Ready, '1': Ready)
o_read_value_valid	Output	Validity of value of the SCCB Slave Register ('0': Not Valid, '1': Valid)
o_read_value	Output	Value of the SCCB Slave Register
o_scl	Output	SCCB Serial Clock ('0'-'Z'(as '1') values, working with Pull-Up)
io_sda	InOut	SCCB Serial Data ('0'-'Z'(as '1') values, working with Pull-Up)