AD9548SLASHPCBZ datasheet(59/112 Pages) AD

59 / 112 page

AD9548

Rev. 0 | Page 59 of 112

Read and write access to the register map may be restricted

depending on the register in question, the source and direction

of access, and the current state of the device. Each register can

be classified into one or more access types. When more than

one type applies, the most restrictive condition that applies at

the moment is used.

Whenever access is denied to a register, all attempts to read the

are ignored. Access to nonexistent registers is handled in the

same way as for a denied register.

Regular Access

Registers with regular access do not fall into any other category.

Both read and write access to registers of this type can be from

either the serial ports or EEPROM controller. However, only

one of these sources can have access to a register at any given

time (access is mutually exclusive). Whenever the EEPROM

controller is active, either in load or store mode, it has exclusive

access to these registers.

Read-Only Access

An R in the Opt column of the register map identifies read-only

registers. Access is available at all times, including when the

EEPROM controller is active.

Exclusion from EEPROM Access

An E in the Opt column of the register map identifies a register

with contents that are inaccessible to the EEPROM. That is, the

contents of this type of register cannot be transferred directly to

the EEPROM or vice versa. Note that read-only registers (R) are

inaccessible to the EEPROM, as well.

AD9548/PCBZ 数据表(PDF) 59 Page - Analog Devices