Datasheet > 03X_ADDR

03X_ADDR

更新时间： 2024-09-12 23:16:55

品牌	Logo	应用领域
其他 - ETC		微处理器
页数	文件大小	规格书
2页	68K
描述
Byte and Half-Word Addressing in the Am29030 and Am29035 Microprocessors

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03X_ADDR 数据手册

external word is determined by the next-to-least

significant bit of an address and the BO bit.

This bulletin elaborates on byte and half word

addressing for the Am29030 and Am29035

microprocessors. In addition, it provides a correction

to a table in the Am29030 and Am29035

Additionally, the Option field in load and store

instructions determine byte, half-word, or word

accesses for the processor. However, for the

EXBYTE, EXHW, EXHWS, INBYTE, and INHW

instructions, the Byte Pointer (BP) field of the ALU

Status Register determines the position of the half-

word within the word. Restated, when these five

instructions are executed, the appropriate value of the

BP field preempts the LSBs of the address to

determine the position of the byte or half-word.

Microprocessors User’s Manual and Data Sheet.

This bulletin affects the following parts:

Am29030 microprocessor

Am29035 microprocessor

All

Finally, for all word and half-word accesses, the

Am29030 and Am29035 processors will either ignore

or force alignment in most cases. Thus, half-word

accesses are forced to be aligned to half-word

boundaries. The processor will trap when an

unaligned half-word access is attempted, which

emulates the non-aligned access in trap code. The

processor will perform unaligned byte accesses. (Note

that this assumes the CPS:TU bit is set. If the

CPS:TU bit is clear, data memory alignment is

ignored. This is described in more detail in Section

3.3.7.3 of the user’s manual.)

This bulletin affects the following documentation:

15723C

Am29030 and Am29035 Microprocessors

User’s Manual and Data Sheet

All 29K Family processors use big-endian byte

ordering for internal registers. However, the

Am29030 and Am29035 processors can access

external memory using big- or little-endian format.

The Byte Order (BO) bit of the configuration register

sets the endian orientation. Big-endian orientation

(BO=0) places the most significant bit (MSB) of data

at the address “x..x00” and the least significant bit

(LSB) of data at address “x..x11”. Little-endian

orientation (BO=1) places the MSB at “x..x11” and

the LSB at “x..x00”.

For big-endian orientation (BO=0), bytes are ordered

within words such that a 00 in the BP field or in the

least-significant address bits selects the high-order

byte of a word; a 11, the low-order byte of a word.

Again, the BP field is only referenced for the

EXBYTE, EXHW, EXHWS, INBYTE, and INHW

instructions.

For little-endian orientation (BO=1), a 00 in the BP

field or in the two least-significant address bits selects

the low-order byte of a word. A value of 11 selects

the high-order byte.

Big endian (BO=0)

Little endian (BO=1)

aa bb cc dd

dd cc bb aa

For a half-word access, only the MSB of the BP field

or the next-to-least-significant address bit selects the

appropriate half-word. Since the LSB of the BP field

or the address bits do not determine the half-word

selection, the alignment of half-word data types are

For all external byte and half-word accesses, the

selection of a byte within an external word is

determined by the two LSBs of an address and the

BO bit. The selection of a half-word within an

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与03X_ADDR相关器件

型号	品牌	获取价格	描述	数据表
03X_ARBITER	ETC	获取价格	Arbiter Solution for Shared-Bus Systems Using the Am29030 or Am29035 Microprocessor
03XAF-2S	JST	获取价格	XAF连接器是一款压接插座型连接器，它与现有XA连接器压着塑壳(插头塑壳)兼容。穿孔式、贴
03-XC2151	TOREX	获取价格	CMOS IC
03YPD072	SUMIDA	获取价格	Car Audio Device Power Choke
03ZA-3H	JST	获取价格	双U形插口压接部绝缘筒结构位于双槽之间的绝缘筒牢牢夹住导线，并保护其不受焊接热或焊接后
03ZA-8M	JST	获取价格	双U形插口压接部绝缘筒结构位于双槽之间的绝缘筒牢牢夹住导线，并保护其不受焊接热或焊接后
03ZR-3H-P	JST	获取价格	双U形插口压着部箱型带座插头*同一带座插头可用于ZH压着式连接器。
03ZR-8M-P	JST	获取价格	双U形插口压着部箱型带座插头*同一带座插头可用于ZH压着式连接器。
04.344.0153.8	ETC	获取价格	ADC 1 YELLOW
04.344.0353.8	ETC	获取价格	ADC 2 5 YELLOW

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