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參數(shù)資料
| 型號： | ADM1069AST-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32 |
| 封裝： | MS-026-BBA, LQFP-32 |
| 文件頁數(shù)： | 26/36頁 |
| 文件大小： | 763K |
| 代理商： | ADM1069AST-REEL7 |
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ADM1069
Rev. A | Page 32 of 36
6
In the ADM1069, the receive byte protocol is used to read a
single byte of data from a RAM or EEPROM location whose
address has previously been set by a send byte or write
byte/word operation, as shown in Figure 44.
04735-045
23
14
5
SLAVE
ADDRESS
S
R
DATA
P
A
Figure 44. Single Byte Read from EEPROM or RAM
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 ADM1069, 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:
1.
The master device asserts a start condition on SDA.
2.
The master sends the 7-bit slave address followed by the
write bit (low).
3.
The addressed slave device asserts ACK on SDA.
4.
The master sends a command code that tells the slave
device to expect a block read. The ADM1069 command
code for a block read is 0xFD (1111 1101).
5.
The slave asserts ACK on SDA.
6.
The master asserts a repeat start condition on SDA.
7.
The master sends the 7-bit slave address followed by the
read bit (high).
8.
The slave asserts ACK on SDA.
9.
The ADM1069 sends a byte-count data byte that tells the
master how many data bytes to expect. The ADM1069
always returns 32 data bytes (0x20), which is the maximum
allowed by the SMBus 1.1 specification.
10. The master asserts ACK on SDA.
11. The master receives 32 data bytes.
12. The master asserts ACK on SDA after each data byte.
13. The master asserts a stop condition on SDA to end the
transaction.
04735-
046
SLAVE
ADDRESS
SW A
2
COMMAND 0xFD
(BLOCK READ)
4
13
A
5
S
6
SLAVE
ADDRESS
7
BYTE
COUNT
910
12
11
A
RA
8
DATA
1
DATA
32
13
A
14
P
A
Figure 45. Block Read from EEPROM or RAM
Error Correction
The ADM1069 provides the option of issuing a packet error
correction (PEC) byte after a write to RAM, a write to EEPROM,
a block write to RAM/EEPROM, or a block read from RAM/
EEPROM. This enables the user to verify that the data received
by or sent from the ADM1069 is correct. The PEC byte is an
optional byte sent after that last data byte has been written to or
read from the ADM1069. The protocol is as follows:
1.
The ADM1069 issues a PEC byte to the master. The master
checks the PEC byte and issues another block read, if the
PEC byte is incorrect.
2.
A no acknowledge (NACK) is generated after the PEC byte
to signal the end of the read.
Note that the PEC byte is calculated using CRC-8. The frame
check sequence (FCS) conforms to CRC-8 by the polynomial
C(x) = x8 + x2 + x1 + 1
See the SMBus 1.1 specification for details.
An example of a block read with the optional PEC byte is shown
in Figure 46.
04735-
047
SLAVE
ADDRESS
SW A
2
COMMAND 0xFD
(BLOCK READ)
4
13
A
5
S
6
SLAVE
ADDRESS
7
BYTE
COUNT
910
12
11
A
RA
8
DATA
1
DATA
32
A
13
PEC
14
A
15
P
A
Figure 46. Block Read from EEPROM or RAM with PEC
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