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| 型號： | KSZ9021RN-EVAL |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 38/58頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR KSZ9021RN |
| 標準包裝： | 1 |
| 主要目的： | 接口，以太網控制器（PHY 和 MAC） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | KSZ9021RN |
| 已供物品： | 板 |
| 相關產品： | 576-3978-ND - IC TXRX 10/100/1000 SGL 48QFN 576-3637-ND - IC TXRX 10/100/1000 SGL 48QFN |
| 其它名稱： | 576-3874 |
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2010 Microchip Technology Inc.
DS22265A-page 43
MCP444X/446X
4.2.1
NONVOLATILE MEMORY
(EEPROM)
This memory can be grouped into two uses of
nonvolatile memory. These are:
The nonvolatile wipers start functioning below the
devices VPOR/VBOR trip point.
4.2.1.1
General Purpose Registers
These locations allow the user to store up to 5 (9-bit)
locations worth of information.
4.2.1.2
Nonvolatile Wiper Registers
These locations contain the wiper values that are
loaded into the corresponding volatile wiper register
whenever the device has a POR/BOR event. There are
four registers, one for each resistor network.
The nonvolatile wiper register enables stand-alone
operation of the device (without Microcontroller control)
after being programmed to the desired value.
4.2.1.3
Factory Initialization of Nonvolatile
Memory (EEPROM)
The Nonvolatile Wiper values will be initialized to
mid-scale value. This is shown in Table 4-2.
The General purpose EEPROM memory will be
programmed to a default value of 0x000.
It is good practice in the manufacturing flow to
configure the device to your desired settings.
TABLE 4-2:
DEFAULT FACTORY
SETTINGS SELECTION
4.2.1.4
Special Features
There are 5 nonvolatile bits that are not directly
mapped into the address space. These bits control the
following functions:
EEPROM Write Protect
WiperLock Technology for Nonvolatile Wiper 0
WiperLock Technology for Nonvolatile Wiper 1
WiperLock Technology for Nonvolatile Wiper 2
WiperLock Technology for Nonvolatile Wiper 3
The operation of WiperLock Technology is discussed in
. The state of the WL0, WL1, WL2, WL3,
and WP bits is reflected in the STATUS register (see
EEPROM Write Protect
All internal EEPROM memory can be Write Protected.
When EEPROM memory is Write Protected, Write
commands to the internal EEPROM are prevented.
Write Protect (WP) can be enabled/disabled by two
methods. These are:
External WP Hardware pin (MCP44X1 devices
only)
Nonvolatile configuration bit (WP)
High Voltage commands are required to enable and
disable the nonvolatile WP bit. These commands are
shown in Section 7.8 “Modify Write Protect or
.
To write to EEPROM, both the external WP pin and the
internal WP EEPROM bit must be disabled. Write
Protect does not block commands to the volatile
registers.
4.2.2
VOLATILE MEMORY (RAM)
There are seven Volatile Memory locations. These are:
Volatile Wiper 0
Volatile Wiper 1
Volatile Wiper 2
Volatile Wiper 3
Status Register
Terminal Control (TCON0) Register 0
Terminal Control (TCON)1 Register 1
The volatile memory starts functioning at the RAM
retention voltage (VRAM).
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8-bit 7-bit
-502
5.0 k
Ω
Mid scale 80h
40h
Disabled
-103
10.0 k
Ω Mid scale 80h
40h
Disabled
-503
50.0 k
Ω Mid scale 80h
40h
Disabled
-104
100.0 k
Ω Mid scale 80h
40h
Disabled
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