Micrel M9999-101204 32 October 2004 Acknowledge Polling The MIC3000’s non-volatile memory cannot be accessed during the internal wr" />
參數(shù)資料
型號(hào)： MIC3000BML TR
廠商： Micrel Inc
文件頁數(shù)： 26/58頁
文件大?。?/td> 0K
描述： IC TXRX OPTICAL MANAGEMENT 24MLF
標(biāo)準(zhǔn)包裝： 1,000
類型： 收發(fā)器
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤，24-MLF?
供應(yīng)商設(shè)備封裝： 24-MLF?（4x4）
包裝： 帶卷 (TR)
其它名稱： MIC3000BMLTR
MIC3000BMLTR-ND
MIC3000
Micrel
M9999-101204
32
October 2004
Acknowledge Polling
The MIC3000’s non-volatile memory cannot be accessed
during the internal write process. To allow for maximum
speed bulk writes, the MIC3000 supports acknowledge poll-
ing. The MIC3000 will not acknowledge serial bus transac-
tions while internal writes are in progress. The host may
therefore monitor for the end of the write process by periodi-
cally checking for an acknowledgement.
Write Protection and Data Security
OEM Password
A password is required to access the OEM areas of the
MIC3000, specifically the non-volatile memory, look-up tables,
and registers at serial addresses A4h and A6h. A four-byte
field, OEMPWSET, at serial address A6h is used for setting
the OEM password. The OEM password is set by writing
OEMPWSET with the new value. The password comparison
is performed following the write to the MSB of the OEMPW,
address 7Bh at serial address A2h. Therefore, this byte
must be written last! A four-byte burst-write sequence to
address 78h may be used as this will result in the MSB being
written last. The new password will not take effect until after
a power-on reset occurs or a warm reset is performed using
the RST bit in OEMCFG0. This allows the new password to
be verified before it takes effect.
The corresponding four-byte field for password entry, OEMPW,
is located at serial address A2h. This field is therefore always
visible to the host system. OEMPW is compared to the four-
byte OEMPWSET field at serial address A6h. If the two fields
match, access is allowed to the OEM areas of the MIC3000
non-volatile memory at serial addresses A4h and A6h. If
OEMPWSET is all zeroes, no password security will exist.
The value in OEMPW will be ignored. This helps prevent a
deliberately unsecured MIC3000 from being inadvertently
locked. Once a valid password is entered, the MIC3000 OEM
areas will be accessible. The OEM areas may be re-secured
D7 D6 D5 D4 D3 D2 D1 D0 A
D4
D5
D6
D3 D2 D1 D0
D7
/A P
3rd Data Byte to
MIC3000
4th Data Byte to
MIC3000
STOP
R/W = READ
ACKNOWLEDGE
NOT ACKNOWLEDGE
Master to slave transfer,
i.e., DATA driven by master.
Slave to master transfer,
i.e., DATA driven by slave.
S 1010
000
0 AXXXXXXXXA
MIC3000 Slave Address
DATA
CLK
Register Address
START
R/W = WRITE
ACKNOWLEDGE
D7 D6 D5 D4 D3 D2 D1 D0 A
D3
D4
D5
D2 D1 D0
D6
D7
1st Data Byte to
MIC3000
2nd Data Byte to
MIC3000
ACKNOWLEDGE
Figure 24. Four-Byte Page_Write Protocol
by writing an incorrect password value at OEMPW, e.g., all
zeroes. In all cases OEMPW must be written LSB first
through MSB last. The OEM areas will be inaccessible
following the final write operation to OEMPW’s LSB. The
OEMPW field is reset to all zeros at power on. Any values
written to these locations will be readable by the host regard-
less of the locked/unlocked status of the device. If OEMPWSET
is set to zero (00000000h), the MIC3000 will remain unlocked
regardless of the contents of the OEMPW field. This is the
factory default security setting.
NOTE: A valid OEM password allows access to the OEM and
user areas of the chip, i.e., the entire memory map, regard-
less of any user password that may be in place. Once the
OEM areas are locked, the user password can provide
access and write protection for the user areas.
User Password
A password is required to access the USER areas of the
MIC3000, specifically the non-volatile memory at serial ad-
dresses A0h and A2h. A one-byte field, USRPWSET at serial
address A2h is used for setting the USER password.
USRPWSET is compared to the USRPW field at serial
address A2h. If the two fields match, access is allowed to the
USER areas of the MIC3000 non-volatile memory at serial
addresses A0h and A2h.The USER password is set by writing
USRPWSET with the new value. The new password will not
take effect until after a power-on reset occurs or a warm reset
is performed using the RST bit in OEMCFG0. This allows the
new password to be verified before it takes effect.
NOTE: A valid OEM password allows access to the OEM and
user areas of the chip, i.e., the entire memory map, regard-
less of any user password that may be in place. Once the
OEM areas are locked, the user password can provide
access and write protection for the user areas. If a valid OEM
password is in place, the user password will have no effect.
相關(guān)PDF資料
PDF描述
MIC3001BML TR IC FOM MANAGEMENT W/CALIBR 24MLF
MIC74BQS TR IC I/O EXPANDER I2C 8B 16QSOP
MICRF302YML TR IC ENCODER PAR QWIKRADIO 10-MLF
MK10DN512ZVLL10 IC ARM CORTEX MCU 512KB 100LQFP
MK10DX128VFM5 IC ARM CORTEX MCU 128KB 32QFN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MIC-3000HRS 制造商:Pulse 功能描述:Headset Condenser Microphone with 4Pin HIROSE Plug - Beige
MIC-3000J 制造商:Pulse 功能描述:Headset Condenser Microphone with 3.5mm Plug - Beige
MIC-3000LJ 制造商:Pulse 功能描述:Headset Condenser Microphone with Locking 3.5mm Plug - Beige
MIC-3000X3 制造商:Pulse 功能描述:Headset Condenser Microphone with 3Pin Mini XLR Plug - Beige
MIC-3000X4 制造商:Pulse 功能描述:Headset Condenser Microphone with 4Pin Mini XLR Plug - Beige
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*