TMPR4937 datasheet(45/552 Pages) TOSHIBA

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Conventions in this Manual

Value Conventions

•

Hexadecimal values are expressed as in the following example. (This value is expressed as 42 in

the decimal system.)

•

KB (kilobyte) = 1,024 Bytes,

MB (megabyte) = 1,024

× 1,024 = 1,048,576 Bytes,

GB (gigabyte) = 1,024

× 1,024 × 1,024 = 1,073,741,824 Bytes

Data Conventions

•

Byte: 8 bits

•

Half-word: 2 consecutive Bytes (16 bits)

•

Word: 4 consecutive Bytes (32 bits)

•

Double-word: 8 consecutive Bytes (64 bits)

Signal Conventions

•

An asterisk (“*”) is added to the end of signal names to indicate Low Active signals. (Example:

RESET*)

•

“Assert” means to move a signal to its Active level. “Deassert” means to move a signal to its

Inactive level.

•

Bit operation is expressed as follows.

Set: Put a bit in the “1” position.

Clear: Put a bit in the “0” position.

•

Properties of each bit in a register are expressed as follows.

Read only. The software cannot change the bit value.

Write only. The value that is read is undefined.

R/W:

Read/Write is possible.

W1C

Write 1 Clear. This corresponding bit is cleared when “1” is written to this bit. “0” is

invalid if written.

R/W1C: Read/Write 1 Clear. These bits can be read from and written to. The corresponding bit is

cleared when “1” is written to this bit. “0” is invalid if written.

R/W0C: Read/Write 0 Clear. These bits can be read from and written to. The corresponding bit is

cleared when “0” is written to this bit. “1” is invalid if written.

R/W1S Read/Write 1 Set. These bits can be read from and written to. The corresponding bit is set

when “1” is written to this bit. “0” is invalid if written.

RS/WC Read Set/Write Clear. These bits can be read from and written to. The bits is set

when read, and a write of an arbitrary value to the bit clears it.

R/L:

Property unique to the PCI Controller. This bit can be read. The value of this bit can only

be changed by the method described in “10.3.14: Set Configuration Space”.

•

Registers and the register bit/field name are expressed as “<register name>.<bit/field name>”.

Example: CCFG.TOE

The above example indicates Time Out Bus Error Enable (TOE), a bit field of bit 14 in the Chip

Configuration Register (CCFG).

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