CXD3526GG 查看數據表（PDF） - Sony Semiconductor

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CXD3526GG

Digital Signal Driver/Timing Generator

Sony Semiconductor 

CXD3526GG

(3) External ROM I/F slave address setting

The external ROM I/F of this IC transfers data into and out of memory using the serial bus as host I/F. Since

operations conform to I2C bus protocol just as with the host I/F, this section only describes the slave address.

To access the external EEPROM, when access conditions are established, "Start" is sent, and then 7 bits

representing the slave address are output, and the R/W code is output. "Acknowledgment" is received to the

9th bit from the external EEPROM, and the IC enters either read or write mode. The slave address is

determined based on ROM_MAP of the serial bus ROM I/F control register and RSLV_ADDR of the serial bus

ROM slave address register as previously described.

The user should set the upper 4 bits of the device address of the EEPROM to be used in RSLV_ADDR and the

memory size in ROM_MAP. This allows memory to be used without awareness of memory boundaries of

actual memory used for the setting memory space.

RSDA

Slave address

1st memory address 2nd memory address

(n)

(n)

W

Write data (n)

Byte Write Operation

(4) Memory location and data size setting for the external EEPROM

Since this IC performs refresh and write-back operations, it is necessary to set which addresses of the

external EEPROM gamma data and color shading data have been located in.

The registers used to make these settings are the external EEPROM gamma data start address register and

the external EEPROM color shading data start address register. By specifying the starting position of the data

area in these registers data access from the specified addresses is possible during refresh or write-back

operation.

Units of 1K-byte can be used to set the start addresses which can be set in these registers.

In addition, the size of data transferred during refresh and write-back operations is fixed at 2K bytes for each

color in the case of gamma data. The number of bytes transferred in the case of color shading data is the value

stored in the color shading data size register plus one.

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