收藏本站
ADM1168
Block Read
In a block read operation, the master device reads a block of data
from a slave device. The start address for a block read must have
been set previously. In the ADM1168, this is done by a send byte
operation to set a RAM address, or a write byte/word operation to
set an EEPROM address. The block read operation itself consists of
a send byte operation that sends a block read command to the
slave, immediately followed by a repeated start and a read operation
that reads out multiple data bytes, as follows:
Data Sheet
Error Correction
The ADM1168 provides the option of issuing a packet error
checking (PEC) byte after a write to the RAM, a write to the
EEPROM, a block write to the RAM/EEPROM, or a block read
from the RAM/EEPROM. This option enables the user to verify
that the data received by or sent from the ADM1168 is correct.
The PEC byte is an optional byte sent after that last data byte has
been written to or read from the ADM1168. The protocol is the
same as a block read for Step 1 to Step 12 and then proceeds as
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
The master device asserts a start condition on SDA.
The master sends the 7-bit slave address followed by the
write bit (low).
The addressed slave device asserts ACK on SDA.
The master sends a command code that tells the slave
device to expect a block read. The ADM1168 command
code for a block read is 0xFD (1111 1101).
The slave asserts ACK on SDA.
The master asserts a repeat start condition on SDA.
The master sends the 7-bit slave address followed by the
read bit (high).
The slave asserts ACK on SDA.
The ADM1168 sends a byte-count data byte that tells the
master how many data bytes to expect. The ADM1168
always returns 32 data bytes (0x20), which is the maximum
allowed by the SMBus 1.1 specification.
The master asserts ACK on SDA.
The master receives 32 data bytes.
The master asserts ACK on SDA after each data byte.
The master asserts a stop condition on SDA to end the
transaction. See Figure 35.
follows:
13. The ADM1168 issues a PEC byte to the master. The master
checks the PEC byte and issues another block read, if the
PEC byte is incorrect.
14. A no acknowledge (NACK) is generated after the PEC byte
to signal the end of the read.
15. The master asserts a stop condition on SDA to end the
transaction.
Note that the PEC byte is calculated using CRC-8. The frame
check sequence (FCS) conforms to CRC-8 by the polynomial
C ( x ) = x 8 + x 2 + x 1 + 1
See the SMBus 1.1 specification for details.
An example of a block read with the optional PEC byte is shown
in Figure 36.
1
2
3
4
5 6
7
8
9
10
11
12
S ADDRESS W A COMMAND 0xFD A S
ADDRESS R A COUNT A
DATA A
SLAVE
(BLOCK READ)
SLAVE BYTE
1
13
Figure 35. Block Read from the EEPROM or RAM
DATA
32
A
P
1
2
3
4
5 6
7
8
9
10
11
12
W A COMMAND 0xFD A S ADDRESS R A COUNT A
S
SLAVE
ADDRESS
(BLOCK READ)
SLAVE BYTE
DATA
1
A
13 14 15
DATA
32
A PEC A P
Figure 36. Block Read from the EEPROM or RAM with PEC
Rev. A | Page 26 of 28
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
EVAL-ADM1170EBZ BOARD EVALUATION FOR ADM1170
EVAL-ADM1171EBZ BOARD EVALUATION FOR ADM1171
EVAL-ADM1172EBZ BOARD EVALUATION FOR ADM1172
EVAL-ADM1175EBZ BOARD EVALUATION FOR ADM1175
EVAL-ADM1176EBZ BOARD EVALUATION FOR ADM1176
EVAL-ADM1177EBZ BOARD EVALUATION FOR ADM1177
EVAL-ADM1178EBZ BOARD EVALUATION FOR ADM1178
EVAL-ADM1191EBZ BOARD EVALUATION FOR ADM1191
相关代理商/技术参数
EVAL-ADM1169LQEBZ 功能描述:BOARD EVAL FOR ADM1169LQ RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:Super Sequencer® 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源
EVAL-ADM1170EBZ 功能描述:BOARD EVALUATION FOR ADM1170 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADM1171EBZ 功能描述:BOARD EVALUATION FOR ADM1171 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADM1172EBZ 功能描述:BOARD EVALUATION FOR ADM1172 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADM1175EBZ 功能描述:BOARD EVALUATION FOR ADM1175 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADM1176EBZ 功能描述:BOARD EVALUATION FOR ADM1176 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADM1177EBZ 功能描述:BOARD EVALUATION FOR ADM1177 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADM1178EBZ 功能描述:BOARD EVALUATION FOR ADM1178 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081