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參數(shù)資料
| 型號(hào)： | KSZ9021RNI |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 54/58頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX 10/100/1000 SGL 48QFN |
| 標(biāo)準(zhǔn)包裝： | 260 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 8/8 |
| 規(guī)程： | 千兆位以太網(wǎng) |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 48-QFN（7x7） |
| 包裝： | 托盤 |
| 配用： | 576-3874-ND - BOARD EVALUATION FOR KSZ9021RN |
| 其它名稱： | 576-3978 KSZ9021RNI-ND |
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MCP444X/446X
DS22265A-page 58
2010 Microchip Technology Inc.
6.2.7
GENERAL CALL
The General Call is a method that the “Master” device
can communicate with all other “Slave” devices. In a
Multi-Master application, the other Master devices are
operating in Slave mode. The General Call address
has two documented formats. These are shown in
Figure 6-11. We have added a MCP44XX format in this
figure as well.
This will allow customers to have multiple I2C Digital
Potentiometers on the bus and have them operate in a
synchronous fashion (analogous to the DAC Sync pin
functionality). If these MCP44XX 7-bit commands
conflict with other I2C devices on the bus, then the
customer will need two I2C busses and ensure that the
devices are on the correct bus for their desired
application functionality.
Dual Pot devices can not update both Pot0 and Pot1
from a single command. To address this, there are
General Call commands for the Wiper 0, Wiper 1, and
the TCON registers.
Table 6-3 shows the General Call Commands. Three
commands are specified by the I2C specification and
are not applicable to the MCP44XX (so command is
Not Acknowledged) The MCP44XX General Call
Commands are Acknowledge. Any other command is
Not Acknowledged.
TABLE 6-3:
GENERAL CALL COMMANDS
Note:
Only one General Call command per issue
of the General Call control byte. Any
additional General Call commands are
ignored and Not Acknowledged.
7-bit
Command
(1, 2, 3)
Comment
‘1000 00d’b Write Next Byte (Third Byte) to Volatile
Wiper 0 Register
‘1001 00d’b Write Next Byte (Third Byte) to Volatile
Wiper 1 Register
‘1100 00d’b Write Next Byte (Third Byte) to TCON
Register
‘1000 010’b
or
‘1000 011’b
Increment Wiper 0 Register
‘1001 010’b
or
‘1001 011’b
Increment Wiper 1 Register
‘1000 100’b
or
‘1000 101’b
Decrement Wiper 0 Register
‘1001 100’b
or
‘1001 101’b
Decrement Wiper 1 Register
Note 1:
Any other code is Not Acknowledged.
These codes may be used by other
devices on the I2C bus.
2:
The 7-bit command always appends a “0”
to form 8-bits.
3:
“d” is the D8 bit for the 9-bit write value.
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